| Abbott's booby | Papasula (=Sula) abbotti | Endangered | Wherever found | 06-14-1976 |
| Aboriginal Prickly-apple | Harrisia (=Cereus) aboriginum (=gracilis) | Endangered | | 11-25-2013 |
| Acklins ground iguana | Cyclura rileyi nuchalis | Threatened | Wherever found | 06-22-1983 |
| Acuña Cactus | Echinomastus erectocentrus var. acunensis | Endangered | Wherever found | 10-31-2013 |
| Addax | Addax nasomaculatus | Endangered | Wherever found | 09-02-2005 |
| Adriatic sturgeon | Acipenser naccarii | Endangered | Wherever found | 09-04-2014 |
| A`e | Zanthoxylum dipetalum var. tomentosum | Endangered | Wherever found | 10-10-1996 |
| A`e | Zanthoxylum hawaiiense | Endangered | Wherever found | 03-04-1994 |
| A`e | Zanthoxylum oahuense | Endangered | Wherever found | 10-18-2012 |
| African coelacanth | Latimeria chalumnae | Threatened | Tanzanian Distinct Population Segment (DPS) of African coelacanth | 04-28-2016 |
| African dwarf crocodile | Osteolaemus tetraspis tetraspis | Endangered | Wherever found | 06-14-1976 |
| African elephant | Loxodonta africana | Threatened | Wherever found | 06-11-1978 |
| African penguin | Spheniscus demersus | Endangered | Wherever found | 10-29-2010 |
| African slender-snouted crocodile | Crocodylus cataphractus | Endangered | Wherever found | 03-28-1972 |
| African viviparous toads | Nectophrynoides spp. | Endangered | Wherever found | 06-14-1976 |
| African wild ass | Equus africanus | Endangered | Wherever found | 06-02-1970 |
| African wild dog | Lycaon pictus | Endangered | Wherever found | 01-23-1984 |
| `Ahinahina | Argyroxiphium sandwicense ssp. macrocephalum | Threatened | Wherever found | 05-15-1992 |
| `Ahinahina | Argyroxiphium sandwicense ssp. sandwicense | Endangered | Wherever found | 03-21-1986 |
| `Aiakeakua, popolo | Solanum sandwicense | Endangered | Wherever found | 02-25-1994 |
| `Aiea | Nothocestrum breviflorum | Endangered | Wherever found | 03-04-1994 |
| `Aiea | Nothocestrum latifolium | Endangered | Wherever found | 10-31-2016 |
| `Aiea | Nothocestrum peltatum | Endangered | Wherever found | 02-25-1994 |
| Akekee | Loxops caeruleirostris | Endangered | Wherever found | 05-13-2010 |
| akiapolaau | Hemignathus wilsoni | Endangered | Wherever found | 03-11-1967 |
| Akikiki | Oreomystis bairdi | Endangered | Wherever found | 05-13-2010 |
| `Akoko | Euphorbia celastroides var. kaenana | Endangered | Wherever found | 10-29-1991 |
| `Akoko | Euphorbia deppeana | Endangered | Wherever found | 03-28-1994 |
| `Akoko | Euphorbia eleanoriae | Endangered | Wherever found | 05-13-2010 |
| `Akoko | Euphorbia haeleeleana | Endangered | Wherever found | 10-10-1996 |
| `Akoko | Euphorbia herbstii | Endangered | Wherever found | 10-10-1996 |
| `Akoko | Euphorbia kuwaleana | Endangered | Wherever found | 10-29-1991 |
| `Akoko | Euphorbia remyi var. kauaiensis | Endangered | Wherever found | 05-13-2010 |
| `Akoko | Euphorbia remyi var. remyi | Endangered | Wherever found | 05-13-2010 |
| `Akoko | Euphorbia rockii | Endangered | Wherever found | 10-10-1996 |
| ''Akoko | Euphorbia halemanui | Endangered | Wherever found | 05-13-1992 |
| `aku | Cyanea tritomantha | Endangered | Wherever found | 11-29-2013 |
| `aku`aku | Cyanea platyphylla | Endangered | Wherever found | 10-10-1996 |
| `Ala `ala wai nui | Peperomia subpetiolata | Endangered | Wherever found | 06-27-2013 |
| Ala balik (trout) | Salmo platycephalus | Endangered | Wherever found | 06-02-1970 |
| Alabama beach mouse | Peromyscus polionotus ammobates | Endangered | Wherever found | 06-06-1985 |
| Alabama canebrake pitcher-plant | Sarracenia rubra ssp. alabamensis | Endangered | Wherever found | 03-10-1989 |
| Alabama cavefish | Speoplatyrhinus poulsoni | Endangered | Wherever found | 10-11-1977 |
| Alabama cave shrimp | Palaemonias alabamae | Endangered | Wherever found | 09-07-1988 |
| Alabama lampmussel | Lampsilis virescens | Endangered | Wherever found; Except where listed as Experimental Populations | 06-14-1976 |
| Alabama lampmussel | Lampsilis virescens | Experimental Population, Non-Essential | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 06-14-2001 |
| Alabama leather flower | Clematis socialis | Endangered | Wherever found | 09-26-1986 |
| Alabama moccasinshell | Medionidus acutissimus | Threatened | Wherever found | 03-17-1993 |
| Alabama pearlshell | Margaritifera marrianae | Endangered | Wherever found | 10-10-2012 |
| Alabama red-bellied turtle | Pseudemys alabamensis | Endangered | Wherever found | 06-16-1987 |
| Alabama streak-sorus fern | Thelypteris pilosa var. alabamensis | Threatened | Wherever found | 07-08-1992 |
| Alabama sturgeon | Scaphirhynchus suttkusi | Endangered | Wherever found | 05-05-2000 |
| Alameda whipsnake (=striped racer) | Masticophis lateralis euryxanthus | Threatened | Wherever found | 12-05-1997 |
| Alamosa springsnail | Tryonia alamosae | Endangered | Wherever found | 09-30-1991 |
| Alani | Melicope adscendens | Endangered | Wherever found | 12-05-1994 |
| Alani | Melicope balloui | Endangered | Wherever found | 12-05-1994 |
| Alani | Melicope christophersenii | Endangered | Wherever found | 10-18-2012 |
| Alani | Melicope degeneri | Endangered | Wherever found | 05-13-2010 |
| Alani | Melicope haupuensis | Endangered | Wherever found | 02-25-1994 |
| Alani | Melicope hiiakae | Endangered | Wherever found | 10-18-2012 |
| Alani | Melicope knudsenii | Endangered | Wherever found | 02-25-1994 |
| Alani | Melicope lydgatei | Endangered | Wherever found | 03-28-1994 |
| Alani | Melicope makahae | Endangered | Wherever found | 10-18-2012 |
| Alani | Melicope mucronulata | Endangered | Wherever found | 05-15-1992 |
| Alani | Melicope munroi | Endangered | Wherever found | 09-03-1999 |
| Alani | Melicope ovalis | Endangered | Wherever found | 12-05-1994 |
| Alani | Melicope pallida | Endangered | Wherever found | 02-25-1994 |
| Alani | Melicope paniculata | Endangered | Wherever found | 05-13-2010 |
| Alani | Melicope puberula | Endangered | Wherever found | 05-13-2010 |
| Alani | Melicope quadrangularis | Endangered | Wherever found | 02-25-1994 |
| Alani | Melicope reflexa | Endangered | Wherever found | 10-08-1992 |
| Alani | Melicope saint-johnii | Endangered | Wherever found | 10-10-1996 |
| Alani | Melicope zahlbruckneri | Endangered | Wherever found | 10-10-1996 |
| Alaotra Grebe | Tachybaptus rufolavatus | Endangered | Wherever found | 01-12-1995 |
| Aldabra Warbler (old world warbler) | Nesillas aldabranus | Endangered | Wherever found | 01-12-1995 |
| Aleutian shield fern | Polystichum aleuticum | Endangered | Wherever found | 02-17-1988 |
| Algerian nuthatch | Sitta ledanti | Endangered | Wherever found | 01-12-1995 |
| Allen's Cay iguana | Cyclura cychlura inornata | Threatened | Wherever found | 06-22-1983 |
| Altamaha Spinymussel | Elliptio spinosa | Endangered | Wherever found | 11-10-2011 |
| Amargosa niterwort | Nitrophila mohavensis | Endangered | Wherever found | 05-20-1985 |
| Amargosa vole | Microtus californicus scirpensis | Endangered | Wherever found | 11-15-1984 |
| Amazonian manatee | Trichechus inunguis | Endangered | Wherever found | 06-02-1970 |
| Amber darter | Percina antesella | Endangered | Wherever found | 08-05-1985 |
| American alligator | Alligator mississippiensis | Similarity of Appearance (Threatened) | Wherever found | 03-11-1967 |
| American burying beetle | Nicrophorus americanus | Experimental Population, Non-Essential | In southwestern Missouri, the counties of Cedar, St. Clair, Bates, and Vernon. | 07-22-2011 |
| American burying beetle | Nicrophorus americanus | Threatened | Wherever found, except where listed as an experimental population | 07-13-1989 |
| American chaffseed | Schwalbea americana | Endangered | Wherever found | 09-29-1992 |
| American crocodile | Crocodylus acutus | Threatened | U.S.A. (FL) | 10-28-1975 |
| American crocodile | Crocodylus acutus | Endangered | Wherever found, except in U.S.A. (FL) | 03-20-2007 |
| American hart's-tongue fern | Asplenium scolopendrium var. americanum | Threatened | Wherever found | 07-14-1989 |
| Amsterdam Albatross | Diomedia amsterdamensis | Endangered | Wherever found | 01-12-1995 |
| Anastasia Island beach mouse | Peromyscus polionotus phasma | Endangered | Wherever found | 05-12-1989 |
| `Anaunau | Lepidium arbuscula | Endangered | Wherever found | 10-10-1996 |
| Anchialine pool shrimp | Vetericaris chaceorum | Endangered | Wherever found | 11-29-2013 |
| Anchialine pool Shrimp | Procaris hawaiana | Endangered | Wherever found | 10-31-2016 |
| Andean cat | Felis jacobita | Endangered | Wherever found | 06-14-1976 |
| Andean condor | Vultur gryphus | Endangered | Wherever found | 12-02-1970 |
| Andean flamingo | Phoenicoparrus andinus | Endangered | Wherever found | 09-16-2010 |
| Andrew's frigatebird | Fregata andrewsi | Endangered | Wherever found | 06-14-1976 |
| Andros Island ground iguana | Cyclura cychlura cychlura | Threatened | Wherever found | 06-22-1983 |
| Anegada ground iguana | Cyclura pinguis | Endangered | Wherever found | 06-02-1970 |
| Angel shark | Squatina squatina | Endangered | | 08-31-2016 |
| Angulated tortoise | Geochelone yniphora | Endangered | Wherever found | 06-14-1976 |
| Anjouan Island sparrowhawk | Accipiter francesii pusillus | Endangered | Wherever found | 06-02-1970 |
| Anjouan scops owl | Otus rutilus capnodes | Endangered | Wherever found | 06-02-1970 |
| Anthony's riversnail | Athearnia anthonyi | Endangered | Wherever found; Except where listed as Experimental Populations | 04-15-1994 |
| Anthony's riversnail | Athearnia anthonyi | Experimental Population, Non-Essential | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 10-15-2007 |
| Anthony's riversnail | Athearnia anthonyi | Experimental Population, Non-Essential | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 06-14-2001 |
| Anthricinan yellow-faced bee | Hylaeus anthracinus | Endangered | Wherever found | 10-31-2016 |
| Antioch Dunes evening-primrose | Oenothera deltoides ssp. howellii | Endangered | Wherever found | 05-27-1978 |
| `Anunu | Sicyos albus | Endangered | Wherever found | 10-10-1996 |
| `Anunu | Sicyos macrophyllus | Endangered | Wherever found | 10-31-2016 |
| Apache trout | Oncorhynchus apache | Threatened | Wherever found | 03-11-1967 |
| Apalachicola rosemary | Conradina glabra | Endangered | | 07-12-1993 |
| Apaporis River caiman | Caiman crocodilus apaporiensis | Endangered | Wherever found | 06-14-1976 |
| Apennine chamois | Rupicapra rupicapra ornata | Endangered | Wherever found | 06-14-1976 |
| Aplokating-palaoan | Psychotria malaspinae | Endangered | Wherever found | 11-02-2015 |
| Appalachian elktoe | Alasmidonta raveneliana | Endangered | Wherever found | 11-23-1994 |
| Appalachian monkeyface (pearlymussel) | Theliderma sparsa | Experimental Population, Non-Essential | USA (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 10-15-2007 |
| Appalachian monkeyface (pearlymussel) | Theliderma sparsa | Endangered | Wherever found | 06-14-1976 |
| Applegate's milk-vetch | Astragalus applegatei | Endangered | Wherever found | 07-28-1993 |
| Aquatic box turtle | Terrapene coahuila | Endangered | Wherever found | 06-04-1973 |
| Arabian gazelle | Gazella gazella | Endangered | Wherever found | 07-27-1979 |
| Arabian oryx | Oryx leucoryx | Endangered | Wherever found | 06-02-1970 |
| Arabian ostrich | Struthio camelus syriacus | Endangered | Wherever found | 06-02-1970 |
| Arabian tahr | Hemitragus jayakari | Endangered | Wherever found | 07-27-1979 |
| Argali | Ovis ammon | Threatened | Kyrgyzstan, Mongolia, and Tajikistan | 06-23-1992 |
| Argali | Ovis ammon | Endangered | Wherever found except Kyrgyzstan, Mongolia, and Tajikistan | 06-14-1976 |
| Argentine angelshark | Squatina argentina | Endangered | | |
| Arizona Cliffrose | Purshia (=Cowania) subintegra | Endangered | Wherever found | 05-29-1984 |
| Arizona eryngo | Eryngium sparganophyllum | Endangered | | 03-04-2021 |
| Arizona hedgehog cactus | Echinocereus arizonicus ssp. arizonicus | Endangered | Wherever found | 11-26-1979 |
| Arkansas fatmucket | Lampsilis powellii | Threatened | Wherever found | 04-05-1990 |
| Arkansas River shiner | Notropis girardi | Threatened | Arkansas River Basin (AR, KS, NM, OK, TX) | 11-23-1998 |
| Armored snail | Marstonia pachyta | Endangered | Wherever found | 02-25-2000 |
| Arroyo (=arroyo southwestern) toad | Anaxyrus californicus | Endangered | Wherever found | 12-16-1994 |
| Aruba Island rattlesnake | Crotalus unicolor | Threatened | Wherever found | 06-22-1983 |
| Ash-breasted tit-tyrant | Anairetes alpinus | Endangered | Wherever found | 07-24-2012 |
| Ash-grey paintbrush | Castilleja cinerea | Threatened | Wherever found | 10-14-1998 |
| Ash Meadows Amargosa pupfish | Cyprinodon nevadensis mionectes | Endangered | Wherever found | 05-10-1982 |
| Ash Meadows blazingstar | Mentzelia leucophylla | Threatened | Wherever found | 05-20-1985 |
| Ash Meadows gumplant | Grindelia fraxinipratensis | Threatened | Wherever found | 05-20-1985 |
| Ash Meadows ivesia | Ivesia kingii var. eremica | Threatened | Wherever found | 05-20-1985 |
| Ash meadows milk-vetch | Astragalus phoenix | Threatened | Wherever found | 05-20-1985 |
| Ash Meadows naucorid | Ambrysus amargosus | Threatened | Wherever found | 05-20-1985 |
| Ash Meadows speckled dace | Rhinichthys osculus nevadensis | Endangered | Wherever found | 05-10-1982 |
| Ash Meadows sunray | Enceliopsis nudicaulis var. corrugata | Threatened | Wherever found | 05-20-1985 |
| Ashy dogweed | Thymophylla tephroleuca | Endangered | Wherever found | 07-19-1984 |
| Asian bonytongue | Scleropages formosus | Endangered | Wherever found | 06-14-1976 |
| Asian elephant | Elephas maximus | Endangered | Wherever found | 06-14-1976 |
| Asian golden (=Temmnick's) cat | Catopuma (=Felis) temminckii | Endangered | Wherever found | 06-14-1976 |
| Asian tapir | Tapirus indicus | Endangered | Wherever found | 06-14-1976 |
| Asian wild ass | Equus hemionus | Endangered | Wherever found | 06-02-1970 |
| Asplenium-leaved diellia | Asplenium dielerectum | Endangered | Wherever found | 11-10-1994 |
| Assimulans yellow-faced bee | Hylaeus assimulans | Endangered | Wherever found | 10-31-2016 |
| Atitlan grebe | Podilymbus gigas | Endangered | Wherever found | 06-02-1970 |
| Atlantic pigtoe | Fusconaia masoni | Threatened | Wherever found | 12-16-2021 |
| Atlantic salmon | Salmo salar | Endangered | Gulf of Maine DPS - See 50 CFR 224.101 | 06-19-2009 |
| Atlantic salt marsh snake | Nerodia clarkii taeniata | Threatened | Wherever found | 12-29-1977 |
| Atlantic sturgeon | Acipenser oxyrinchus oxyrinchus | Endangered | Chesapeake Bay DPS - See 50 CFR 224.101 | 02-06-2012 |
| Atlantic sturgeon | Acipenser oxyrinchus oxyrinchus | Endangered | South Atlantic DPS - See 50 CFR 224.101 | 02-06-2012 |
| Atlantic sturgeon | Acipenser oxyrinchus oxyrinchus | Threatened | Gulf of Maine DPS - See 50 CFR 223.102 | 02-06-2012 |
| Atlantic sturgeon | Acipenser oxyrinchus oxyrinchus | Endangered | Carolina DPS - See 50 CFR 224.101 | 02-06-2012 |
| Atlantic sturgeon | Acipenser oxyrinchus oxyrinchus | Endangered | New York Bight DPS - See 50 CFR 224.101 | 02-06-2012 |
| Attwater's greater prairie-chicken | Tympanuchus cupido attwateri | Endangered | Wherever found | 03-11-1967 |
| Audouin's gull | Larus audouinii | Endangered | Wherever found | 06-02-1970 |
| Audubon's crested caracara | Polyborus plancus audubonii | Threatened | U.S.A. (FL) | 07-06-1987 |
| Aukland Island rail | Rallus pectoralis muelleri | Endangered | Wherever found | 06-02-1970 |
| Aupaka | Isodendrion hosakae | Endangered | Wherever found | 01-14-1991 |
| Aupaka | Isodendrion laurifolium | Endangered | Wherever found | 10-10-1996 |
| Aupaka | Isodendrion longifolium | Threatened | Wherever found | 10-10-1996 |
| Austin blind Salamander | Eurycea waterlooensis | Endangered | Wherever found | 09-19-2013 |
| Australian native mouse | Notomys aquilo | Endangered | Wherever found | 06-14-1976 |
| Australian native mouse | Zyzomys pedunculatus | Endangered | Wherever found | 06-14-1976 |
| Autumn Buttercup | Ranunculus aestivalis (=acriformis) | Endangered | Wherever found | 07-21-1989 |
| Avahi | Avahi laniger (entire genus) | Endangered | Wherever found | 06-02-1970 |
| Avon Park harebells | Crotalaria avonensis | Endangered | | 04-27-1993 |
| `Awikiwiki | Canavalia molokaiensis | Endangered | Wherever found | 10-08-1992 |
| `Awikiwiki | Canavalia napaliensis | Endangered | Wherever found | 05-13-2010 |
| `Awikiwiki | Canavalia pubescens | Endangered | Wherever found | 06-27-2013 |
| Awiwi | Schenkia sebaeoides | Endangered | Wherever found | 10-29-1991 |
| 'Awiwi | Kadua cookiana | Endangered | Wherever found | 02-25-1994 |
| Aye-aye | Daubentonia madagascariensis | Endangered | Wherever found | 06-02-1970 |
| Ayumodoki (loach) | Hymenophysa curta | Endangered | Wherever found | 06-02-1970 |
| Azores wood pigeon | Columba palumbus azorica | Endangered | Wherever found | 06-02-1970 |
| Babirusa | Babyrousa babyrussa | Endangered | Wherever found | 06-14-1976 |
| Bachman's warbler (=wood) | Vermivora bachmanii | Endangered | Wherever found | 03-11-1967 |
| Bactrian camel | Camelus bactrianus | Endangered | Wherever found | 06-14-1976 |
| Bactrian deer | Cervus elaphus bactrianus | Endangered | Wherever found | 07-27-1979 |
| Bahaman or Cuban parrot | Amazona leucocephala | Endangered | Wherever found | 06-02-1970 |
| Bakersfield cactus | Opuntia treleasei | Endangered | Wherever found | 07-19-1990 |
| Baker's larkspur | Delphinium bakeri | Endangered | Wherever found | 01-26-2000 |
| Baluchistan bear | Ursus thibetanus gedrosianus | Endangered | Wherever found | 05-16-1986 |
| Banbury Springs limpet | Idaholanx fresti | Endangered | Wherever found | 12-14-1992 |
| Banded cotinga | Cotinga maculata | Endangered | Wherever found | 06-14-1976 |
| Banded hare wallaby | Lagostrophus fasciatus | Endangered | Wherever found | 12-02-1970 |
| Banded wattle-eye | Platysteira laticincta | Endangered | Wherever found | 01-12-1995 |
| Band-rumped storm-petrel | Oceanodroma castro | Endangered | USA (HI) | 10-31-2016 |
| Banggai cardinalfish | Pterapogon kauderni | Threatened | | 02-19-2016 |
| Bannerman's turaco | Tauraco bannermani | Endangered | Wherever found | 01-12-1995 |
| Banteng | Bos javanicus | Endangered | Wherever found | 06-02-1970 |
| Barbados yellow warbler (=wood) | Dendroica petechia petechia | Endangered | Wherever found | 06-02-1970 |
| Barbary deer | Cervus elaphus barbarus | Endangered | Wherever found | 07-27-1979 |
| Barbary hyena | Hyaena hyaena barbara | Endangered | Wherever found | 06-02-1970 |
| Barbary serval | Leptailurus (=Felis) serval constantina | Endangered | Wherever found | 06-02-1970 |
| Barbary stag | Cervus elaphus barbarus | Endangered | Wherever found | 06-02-1970 |
| Bariaco | Trichilia triacantha | Endangered | Wherever found | 02-05-1988 |
| Barneby reed-mustard | Schoenocrambe barnebyi | Endangered | Wherever found | 01-14-1992 |
| Barneby ridge-cress | Lepidium barnebyanum | Endangered | Wherever found | 09-28-1990 |
| Barred bandicoot | Perameles bougainville | Endangered | Wherever found | 12-02-1970 |
| Barrens topminnow | Fundulus julisia | Endangered | Wherever found | 11-20-2019 |
| Barrington land iguana | Conolophus pallidus | Endangered | Wherever found | 06-02-1970 |
| Bar-tailed pheasant | Syrmaticus humaie | Endangered | Wherever found | 06-02-1970 |
| Barton Springs salamander | Eurycea sosorum | Endangered | Wherever found | 04-30-1997 |
| Bartram's hairstreak Butterfly | Strymon acis bartrami | Endangered | Wherever found | 09-11-2014 |
| Bartram's stonecrop | Graptopetalum bartramii | Threatened | Wherever found | 09-29-2021 |
| Bay checkerspot butterfly | Euphydryas editha bayensis | Threatened | Wherever found | 09-18-1987 |
| Bayou darter | Etheostoma rubrum | Threatened | Wherever found | 10-28-1975 |
| Beach jacquemontia | Jacquemontia reclinata | Endangered | | 11-24-1993 |
| Beach layia | Layia carnosa | Threatened | Wherever found | 06-22-1992 |
| bearded Seal | Erignathus barbatus nauticus | Threatened | Beringia DPS - See 50 CFR 223.102 | 02-26-2013 |
| bearded Seal | Erignathus barbatus nauticus | Threatened | Okhotsk DPS - See 50 CFR 223.102 | 02-26-2013 |
| beardless chinchweed | Pectis imberbis | Endangered | Wherever found | 07-15-2021 |
| Bear Valley sandwort | Arenaria ursina | Threatened | Wherever found | 10-14-1998 |
| Beautiful goetzea | Goetzea elegans | Endangered | Wherever found | 04-19-1985 |
| Beautiful pawpaw | Deeringothamnus pulchellus | Endangered | | 09-26-1986 |
| Beautiful shiner | Cyprinella formosa | Threatened | Wherever found | 08-31-1984 |
| Beaver (Mongolian) | Castor fiber birulai | Endangered | Wherever found | 06-14-1976 |
| Bee Creek Cave harvestman | Texella reddelli | Endangered | Wherever found | 09-16-1988 |
| Behren's silverspot butterfly | Speyeria zerene behrensii | Endangered | Wherever found | 12-05-1997 |
| Beluga sturgeon | Huso huso | Threatened | Wherever found | 04-21-2004 |
| beluga whale | Delphinapterus leucas | Endangered | Cook Inlet DPS See 50 CFR 224.101 | 04-13-2011 |
| Ben Lomond spineflower | Chorizanthe pungens var. hartwegiana | Endangered | Wherever found | 02-04-1994 |
| Ben Lomond wallflower | Erysimum teretifolium | Endangered | Wherever found | 02-04-1994 |
| Benton County cave crayfish | Cambarus aculabrum | Endangered | Wherever found | 04-27-1993 |
| Berenghenas halomtano | Solanum guamense | Endangered | Wherever found | 11-02-2015 |
| Bermuda petrel | Pterodroma cahow | Endangered | Wherever found | 06-02-1970 |
| Big Bend gambusia | Gambusia gaigei | Endangered | Wherever found | 03-11-1967 |
| Big Creek Crayfish | Faxonius peruncus | Threatened | | 05-30-2023 |
| Big-leaved crownbeard | Verbesina dissita | Threatened | Wherever found | 10-07-1996 |
| Big Pine partridge pea | Chamaecrista lineata keyensis | Endangered | | 10-31-2016 |
| Big Sandy crayfish | Cambarus callainus | Threatened | Wherever found | 05-09-2016 |
| Big Spring spinedace | Lepidomeda mollispinis pratensis | Threatened | Wherever found | 03-28-1985 |
| Birdwing pearlymussel | Lemiox rimosus | Experimental Population, Non-Essential | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 06-14-2001 |
| Birdwing pearlymussel | Lemiox rimosus | Endangered | Wherever found; Except where listed as Experimental Populations | 06-14-1976 |
| Birdwing pearlymussel | Lemiox rimosus | Experimental Population, Non-Essential | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 10-15-2007 |
| Black Abalone | Haliotis cracherodii | Endangered | Wherever found | 04-13-2011 |
| black-breasted puffleg | Eriocnemis nigrivestis | Endangered | Wherever found | 08-26-2010 |
| Blackburn's sphinx moth | Manduca blackburni | Endangered | Wherever found | 02-01-2000 |
| Black caiman | Melanosuchus niger | Endangered | Wherever found | 06-14-1976 |
| Blackchin guitarfish | Rhinobatos cemiculus | Threatened | | |
| Black clubshell | Pleurobema curtum | Endangered | Wherever found | 04-07-1987 |
| Black colobus monkey | Colobus satanas | Endangered | Wherever found | 10-19-1976 |
| Black-faced impala | Aepyceros melampus petersi | Endangered | Wherever found | 06-02-1970 |
| Black-footed cat | Felis nigripes | Endangered | Wherever found | 06-14-1976 |
| Black-footed ferret | Mustela nigripes | Endangered | Wherever found, except where listed as an experimental population | 03-11-1967 |
| Black-footed ferret | Mustela nigripes | Experimental Population, Non-Essential | U.S.A. (WY and specified portions of AZ, CO, MT, SD, and UT, see 17.84(g)(9)) | 08-21-1991 |
| Black-fronted piping-guan | Pipile jacutinga | Endangered | Wherever found | 06-14-1976 |
| Black hooded (black-headed) antwren | Formicivora erythronotos | Endangered | Wherever found | 01-27-2011 |
| Black howler monkey | Alouatta pigra | Threatened | Wherever found | 10-19-1976 |
| Black lace cactus | Echinocereus reichenbachii var. albertii | Endangered | Wherever found | 11-28-1979 |
| Blackline Hawaiian damselfly | Megalagrion nigrohamatum nigrolineatum | Endangered | Wherever found | 10-18-2012 |
| Black-necked Crane | Grus nigricollis | Endangered | Wherever found | 06-14-1976 |
| Black pinesnake | Pituophis melanoleucus lodingi | Threatened | Wherever found | 11-05-2015 |
| Black rhinoceros | Diceros bicornis | Endangered | Sub-Saharan Africa | 07-14-1980 |
| Blackside dace | Phoxinus cumberlandensis | Threatened | Wherever found | 06-12-1987 |
| Black softshell turtle | Trionyx nigricans | Endangered | Wherever found | 06-14-1976 |
| Black spored quillwort | Isoetes melanospora | Endangered | Wherever found | 02-05-1988 |
| Black Stilt | Himantopus novaezelandiae | Endangered | Wherever found | 01-16-2008 |
| Black warrior (=Sipsey Fork) Waterdog | Necturus alabamensis | Endangered | Wherever found | 02-02-2018 |
| Bliss Rapids snail | Taylorconcha serpenticola | Threatened | Wherever found | 12-14-1992 |
| Blodgett's silverbush | Argythamnia blodgettii | Threatened | | 10-31-2016 |
| Blowout penstemon | Penstemon haydenii | Endangered | Wherever found | 09-01-1987 |
| Blue-billed curassow | Crax alberti | Endangered | Wherever found | 11-29-2013 |
| bluemask darter | Etheostoma akatulo | Endangered | Wherever found | 12-27-1993 |
| Blue Ridge goldenrod | Solidago spithamaea | Threatened | Wherever found | 03-28-1985 |
| Blue shiner | Cyprinella caerulea | Threatened | Wherever found | 04-22-1992 |
| blue-tailed mole skink | Eumeces egregius lividus | Threatened | Wherever found | 11-06-1987 |
| Blue-throated macaw | Ara glaucogularis | Endangered | Wherever found | 10-03-2013 |
| Blue-throated (=ochre-marked) parakeet | Pyrrhura cruentata | Endangered | Wherever found | 06-02-1970 |
| Blue whale | Balaenoptera musculus | Endangered | Wherever found | 06-02-1970 |
| Blunt-nosed leopard lizard | Gambelia silus | Endangered | Wherever found | 03-11-1967 |
| Blyth's tragopan pheasant | Tragopan blythii | Endangered | Wherever found | 06-02-1970 |
| Bocaccio | Sebastes paucispinis | Endangered | Puget Sound-Georgia Basin DPS See 50 CFR 224.101 | 04-13-2011 |
| bog buck moth | Hemileuca maia menyanthevora | Endangered | Wherever found | 04-14-2023 |
| bog turtle | Glyptemys muhlenbergii | Threatened | Wherever found, except GA, NC, SC, TN, VA | 11-04-1997 |
| bog turtle | Glyptemys muhlenbergii | Similarity of Appearance (Threatened) | U.S.A. (GA, NC, SC, TN, VA) | 11-04-1997 |
| Bolson tortoise | Gopherus flavomarginatus | Endangered | Wherever found | 05-17-1979 |
| Bone Cave harvestman | Texella reyesi | Endangered | Wherever found | 09-16-1988 |
| Bontebok | Damaliscus pygarus (=dorcas) dorcas | Endangered | Wherever found | 06-14-1976 |
| Bonytail | Gila elegans | Endangered | Wherever found | 04-23-1980 |
| Boulder darter | Etheostoma wapiti | Experimental Population, Non-Essential | Shoal Creek (from Shoal Creek mile 41.7 (66.7 km)) at the mouth of Long Branch, Lawrence County, TN, downstream to the backwaters of Wilson Reservoir (Shoal Creek mile 14 (22 km)) at Goose Shoals, Lauderdale County, AL, including the lower 5 miles (8 km) of all tributaries that enter this reach. | 09-01-1988 |
| Boulder darter | Etheostoma wapiti | Endangered | Wherever found | 09-01-1988 |
| Boulder star coral | Orbicella franksi | Threatened | Wherever found | 11-13-2014 |
| Bowhead whale | Balaena mysticetus | Endangered | Wherever found | 06-02-1970 |
| Bracted twistflower | Streptanthus bracteatus | Threatened | Wherever found | 05-11-2023 |
| Brady pincushion cactus | Pediocactus bradyi | Endangered | Wherever found | 11-26-1979 |
| Braun's rock-cress | Arabis perstellata | Endangered | Wherever found | 01-03-1995 |
| Braunton's milk-vetch | Astragalus brauntonii | Endangered | Wherever found | 01-29-1997 |
| Brazilian guitarfish | Rhinobatos horkelii | Endangered | | |
| Brazilian sideneck turtle | Phrynops hogei | Endangered | Wherever found | 09-30-1991 |
| Brazilian three-toed sloth | Bradypus torquatus | Endangered | Wherever found | 06-02-1970 |
| Brazillian merganser | Mergus octosetaceus | Endangered | Wherever found | 01-27-2011 |
| Bridled white-eye | Zosterops conspicillatus conspicillatus | Endangered | Wherever found | 08-27-1984 |
| Brindled nail-tailed wallaby | Onychogalea fraenata | Endangered | Wherever found | 12-02-1970 |
| Britton's beargrass | Nolina brittoniana | Endangered | | 04-27-1993 |
| Broad-snouted caiman | Caiman latirostris | Endangered | Bolivia, Brazil, Paraguay, and Uruguay | 06-14-1976 |
| Broad-snouted caiman | Caiman latirostris | Threatened | Argentina DPS | 06-14-1976 |
| Brooksville bellflower | Campanula robinsiae | Endangered | | 07-27-1989 |
| Brother's Island tuatara | Sphenodon guntheri | Endangered | Wherever found | 06-02-1970 |
| Brown-banded antpitta | Grallaria milleri | Endangered | Wherever found | 11-29-2013 |
| Brown bear | Ursus arctos arctos | Endangered | Italy | 06-14-1976 |
| Brown bear | Ursus arctos pruinosus | Endangered | Wherever found | 06-14-1976 |
| Brown Caiman | Caiman crocodilus fuscus (includes Caiman crocodilus chiapasius) | Similarity of Appearance (Threatened) | Wherever found | 05-04-2000 |
| Brown eared pheasant | Crossoptilon mantchuricum | Endangered | Wherever found | 06-02-1970 |
| Brown Hyena | Parahyaena (=Hyaena) brunnea | Endangered | Wherever found | 06-02-1970 |
| Bruneau Hot springsnail | Pyrgulopsis bruneauensis | Endangered | Wherever found | 01-25-1993 |
| Brush-tailed rat-kangaroo | Bettongia penicillata | Endangered | Wherever found | 12-02-1970 |
| Buena Vista Lake ornate Shrew | Sorex ornatus relictus | Endangered | Wherever found | 03-06-2002 |
| Buff-headed marmoset | Callithrix flaviceps | Endangered | Wherever found | 01-23-1984 |
| Bull Trout | Salvelinus confluentus | Experimental Population, Non-Essential | Clackamas River subbasin and the mainstem Willamette River, from Willamette Falls to its points of confluence with the Columbia River, including Multnomah Channel | 12-09-2009 |
| Bull Trout | Salvelinus confluentus | Threatened | U.S.A., conterminous, (lower 48 states) | 06-10-1998 |
| Bulmer's fruit bat (=flying fox) | Aproteles bulmerae | Endangered | Wherever found | 01-23-1984 |
| Bumblebee bat | Craseonycteris thonglongyai | Endangered | Wherever found | 01-23-1984 |
| Bunched arrowhead | Sagittaria fasciculata | Endangered | Wherever found | 08-31-1979 |
| Bunched cory cactus | Coryphantha ramillosa | Threatened | Wherever found | 12-06-1979 |
| Burke's goldfields | Lasthenia burkei | Endangered | Wherever found | 12-02-1991 |
| Burmese peacock turtle | Morenia ocellata | Endangered | Wherever found | 06-14-1976 |
| Butte County meadowfoam | Limnanthes floccosa ssp. californica | Endangered | Wherever found | 06-08-1992 |
| Cabot's tragopan pheasant | Tragopan caboti | Endangered | Wherever found | 06-02-1970 |
| Cabrera's hutia | Capromys angelcabrerai | Endangered | Wherever found | 05-16-1986 |
| Caerulean Paradise flycatcher | Eutrichomyias rowleyi | Endangered | Wherever found | 01-16-2008 |
| Cahaba shiner | Notropis cahabae | Endangered | Wherever found | 10-25-1990 |
| Calamianes (=Philippine) deer | Axis porcinus calamianensis | Endangered | Wherever found | 06-14-1976 |
| California clapper rail | Rallus longirostris obsoletus | Endangered | Wherever found | 10-13-1970 |
| California condor | Gymnogyps californianus | Endangered | U.S.A. only, except where listed as an experimental population | 03-11-1967 |
| California condor | Gymnogyps californianus | Experimental Population, Non-Essential | U.S.A. (specific portions of Arizona, Nevada, and Utah)-see 17.84(j) | 10-16-1996 |
| California condor | Gymnogyps californianus | Experimental Population, Non-Essential | U.S.A. (Oregon, and specific portions of northern California and northwest Nevada) | 05-05-2019 |
| California freshwater shrimp | Syncaris pacifica | Endangered | Wherever found | 10-31-1988 |
| California jewelflower | Caulanthus californicus | Endangered | Wherever found | 07-19-1990 |
| California least tern | Sterna antillarum browni | Endangered | Wherever found | 06-02-1970 |
| California Orcutt grass | Orcuttia californica | Endangered | Wherever found | 08-03-1993 |
| California red-legged frog | Rana draytonii | Threatened | Wherever found | 05-23-1996 |
| California seablite | Suaeda californica | Endangered | | 12-15-1994 |
| California taraxacum | Taraxacum californicum | Endangered | Wherever found | 10-14-1998 |
| California tiger Salamander | Ambystoma californiense | Endangered | U.S.A. (CA - Santa Barbara County) | 01-19-2000 |
| California tiger Salamander | Ambystoma californiense | Threatened | U.S.A. (CA - Central California) | 08-04-2004 |
| California tiger Salamander | Ambystoma californiense | Endangered | U.S.A. (CA - Sonoma County) | 07-22-2002 |
| Calistoga allocarya | Plagiobothrys strictus | Endangered | Wherever found | 10-22-1997 |
| Callippe silverspot butterfly | Speyeria callippe callippe | Endangered | Wherever found | 12-05-1997 |
| Cameroon clawless otter | Aonyx congicus (=congica) microdon | Endangered | Wherever found | 06-02-1970 |
| Cameroon toad | Bufo superciliaris | Endangered | Wherever found | 06-14-1976 |
| Campbell Island flightless teal | Anas aucklandica nesiotis | Endangered | Wherever found | 06-14-1976 |
| Canada Lynx | Lynx canadensis | Threatened | Wherever Found in Contiguous U.S. | 03-24-2000 |
| Canarian black oystercatcher | Haematopus meadewaldoi | Endangered | Wherever found | 01-12-1995 |
| canary rockfish | Sebastes pinniger | Threatened | Puget Sound - Georgia Basin DPS See 50 CFR 223.102 | 04-13-2011 |
| Canby's dropwort | Oxypolis canbyi | Endangered | Wherever found | 02-25-1986 |
| Candy darter | Etheostoma osburni | Endangered | Wherever found | 12-21-2018 |
| Canelo Hills ladies'-tresses | Spiranthes delitescens | Endangered | Wherever found | 01-06-1997 |
| Canoe Creek Clubshell | Pleurobema athearni | Endangered | Wherever found | 08-05-2022 |
| Cantabrian capercaillie | Tetrao urogallus cantabricus | Endangered | Wherever found | 09-12-2011 |
| Capa rosa | Callicarpa ampla | Endangered | Wherever found | 04-22-1992 |
| Cape Fear shiner | Notropis mekistocholas | Endangered | Wherever found | 09-25-1987 |
| Cape Mountain zebra | Equus zebra ssp. zebra | Endangered | | |
| Cape Sable seaside sparrow | Ammodramus maritimus mirabilis | Endangered | Wherever found | 03-11-1967 |
| Cape Sable Thoroughwort | Chromolaena frustrata | Endangered | | 11-25-2013 |
| Capped Langur | Trachypithecus (=Presbytis) pileatus | Endangered | Wherever found | 06-14-1976 |
| Carolina heelsplitter | Lasmigona decorata | Endangered | Wherever found | 06-30-1993 |
| Carolina madtom | Noturus furiosus | Endangered | Wherever found | 07-09-2021 |
| Carolina northern flying squirrel | Glaucomys sabrinus coloratus | Endangered | Wherever found | 07-01-1985 |
| Carson wandering skipper | Pseudocopaeodes eunus obscurus | Endangered | Wherever found | 11-29-2001 |
| Carter's mustard | Warea carteri | Endangered | | 01-21-1987 |
| Carter's panicgrass | Panicum fauriei var. carteri | Endangered | Wherever found | 10-12-1983 |
| Carter's small-flowered flax | Linum carteri carteri | Endangered | | 10-06-2014 |
| Casey's June Beetle | Dinacoma caseyi | Endangered | Wherever found | 10-24-2011 |
| Cassius Blue Butterfly | Leptotes cassius theonus | Similarity of Appearance (Threatened) | Wherever found | 04-06-2012 |
| Catalina Island mountain-mahogany | Cercocarpus traskiae | Endangered | Wherever found | 08-08-1997 |
| Catfish | Pangasius sanitwongsei | Endangered | Wherever found | 06-02-1970 |
| Cat Island turtle | Trachemys terrapen | Endangered | Cat Island in the Bahamas | 09-30-1991 |
| Cauca guan | Penelope perspicax | Endangered | Wherever found | 11-29-2013 |
| Cayman Brac ground iguana | Cyclura nubila caymanensis | Threatened | Wherever found | 06-22-1983 |
| Cebello halumtano | Bulbophyllum guamense | Threatened | Wherever found | 11-02-2015 |
| Cebu black shama (thrush) | Copsychus niger cebuensis | Endangered | Wherever found | 06-02-1970 |
| Cedros Island mule Deer | Odocoileus hemionus cerrosensis | Endangered | Wherever found | 10-28-1975 |
| Central American river turtle | Dermatemys mawii | Endangered | Wherever found | 06-22-1983 |
| Central American tapir | Tapirus bairdii | Endangered | Wherever found | 06-02-1970 |
| Ceraunus Blue Butterfly | Hemiargus ceraunus antibubastus | Similarity of Appearance (Threatened) | Wherever found | 04-06-2012 |
| Ceylon mugger crocodile | Crocodylus palustris kimbula | Endangered | Wherever found | 06-14-1976 |
| Chambered nautilus | Nautilus pompilius | Threatened | | |
| Chapman rhododendron | Rhododendron chapmanii | Endangered | | 05-23-1979 |
| Chatham Island petrel | Pterodroma axillaris | Endangered | Wherever found | 09-14-2009 |
| Chatham Island pigeon | Hemiphaga novaeseelandiae chathamensis | Endangered | Wherever found | 06-02-1970 |
| Chatham Island robin | Petroica traversi | Endangered | Wherever found | 06-02-1970 |
| Cheat Mountain salamander | Plethodon nettingi | Threatened | Wherever found | 08-18-1989 |
| Cheer pheasant | Catreus wallichii | Endangered | Wherever found | 09-28-1990 |
| Cheetah | Acinonyx jubatus | Endangered | Wherever found | 06-02-1970 |
| Cherokee darter | Etheostoma scotti | Threatened | Wherever found | 12-20-1994 |
| Cherry-throated tanager | Nemosia rourei | Endangered | Wherever found | 01-27-2011 |
| Chihuahua chub | Gila nigrescens | Threatened | Wherever found | 10-11-1983 |
| Chilean false larch | Fitzroya cupressoides | Threatened | Wherever found | 12-07-1979 |
| Chilean woodstar | Eulidia yarrellii | Endangered | Wherever found | 09-16-2010 |
| Chiltan (=wild goat) markhor | Capra falconeri (=aegragrus) chiltanensis | Endangered | Wherever found | 06-14-1976 |
| Chimpanzee | Pan troglodytes | Endangered | Wherever found | 09-14-2015 |
| Chinchilla | Chinchilla brevicaudata boliviana | Endangered | Wherever found | 06-14-1976 |
| Chinese alligator | Alligator sinensis | Endangered | Wherever found | 06-14-1976 |
| Chinese Camp brodiaea | Brodiaea pallida | Threatened | Wherever found | 10-14-1998 |
| Chinese egret | Egretta eulophotes | Endangered | Wherever found | 06-02-1970 |
| Chinese giant salamander | Andrias davidianus (=davidianus d.) | Endangered | Wherever found | 06-14-1976 |
| Chinese monal pheasant | Lophophorus lhuysii | Endangered | Wherever found | 06-02-1970 |
| Chinese River Dolphin | Lipotes vexillifer | Endangered | Wherever found | 05-30-1989 |
| Chinese sturgeon | Acipenser sinensis | Endangered | Wherever found | 09-04-2014 |
| Chinook salmon | Oncorhynchus (=Salmo) tshawytscha | Threatened | Snake River spring/summer-run ESU See 50 CFR 223.102 | 04-22-1992 |
| Chinook salmon | Oncorhynchus (=Salmo) tshawytscha | Threatened | Upper Willamette River ESU See 50 CFR 223.102 | 08-02-1999 |
| Chinook salmon | Oncorhynchus (=Salmo) tshawytscha | Endangered | Sacramento River winter-run ESU - See 50 CFR 224.101 | 04-06-1990 |
| Chinook salmon | Oncorhynchus (=Salmo) tshawytscha | Threatened | Puget Sound ESU See 50 CFR 223.102 | 08-02-1999 |
| Chinook salmon | Oncorhynchus (=Salmo) tshawytscha | Threatened | California Coastal ESU - See 50 CFR 223.102 | 12-29-1999 |
| Chinook salmon | Oncorhynchus (=Salmo) tshawytscha | Endangered | Upper Columbia River spring-run ESU See 50 CFR 224.101 | 08-02-1999 |
| Chinook salmon | Oncorhynchus (=Salmo) tshawytscha | Experimental Population, Non-Essential | Central Valley spring-run ESU XN - See 50 CFR 223.102 | 01-30-2014 |
| Chinook salmon | Oncorhynchus (=Salmo) tshawytscha | Threatened | Lower Columbia River ESU See 50 CFR 223.102 | 08-02-1999 |
| Chinook salmon | Oncorhynchus (=Salmo) tshawytscha | Threatened | Snake River fall-run ESU See 50 CFR 223.102 | 04-22-1992 |
| Chinook salmon | Oncorhynchus (=Salmo) tshawytscha | Threatened | Central Valley spring-run ESU See 50 CFR 223.102 | 12-29-1999 |
| Chipola slabshell | Elliptio chipolaensis | Threatened | Wherever found | 03-16-1998 |
| Chiricahua leopard frog | Rana chiricahuensis | Threatened | Wherever found | 06-13-2002 |
| Chisos Mountain hedgehog Cactus | Echinocereus chisoensis var. chisoensis | Threatened | Wherever found | 09-30-1988 |
| Chittenango ovate amber snail | Novisuccinea chittenangoensis | Threatened | Wherever found | 08-02-1978 |
| Choctaw bean | Obovaria choctawensis | Endangered | Wherever found | 10-10-2012 |
| Choctawhatchee beach mouse | Peromyscus polionotus allophrys | Endangered | Wherever found | 06-06-1985 |
| Chorro Creek bog thistle | Cirsium fontinale var. obispoense | Endangered | Wherever found | 12-15-1994 |
| Christmas Island goshawk | Accipiter fasciatus natalis | Endangered | Wherever found | 06-02-1970 |
| Chucky Madtom | Noturus crypticus | Endangered | Wherever found | 09-08-2011 |
| Chum salmon | Oncorhynchus keta | Threatened | Columbia River ESU See 50 CFR 223.102 | 08-02-1999 |
| Chum salmon | Oncorhynchus keta | Threatened | Hood Canal summer-run ESU - See 50 CFR 223.102 | 08-02-1999 |
| Chupacallos | Pleodendron macranthum | Endangered | Wherever found | 11-25-1994 |
| Chupadera springsnail | Pyrgulopsis chupaderae | Endangered | Wherever found | 08-13-2012 |
| Cicek (minnow) | Acanthorutilus handlirschi | Endangered | Wherever found | 06-02-1970 |
| Clara Hunt's milk-vetch | Astragalus clarianus | Endangered | Wherever found | 10-22-1997 |
| Clarke's weaver | Ploceus golandi | Endangered | Wherever found | 01-12-1995 |
| Clark's gazelle | Ammodorcas clarkei | Endangered | Wherever found | 06-02-1970 |
| Clay-Loving wild buckwheat | Eriogonum pelinophilum | Endangered | Wherever found | 07-13-1984 |
| Clay phacelia | Phacelia argillacea | Endangered | Wherever found | 10-29-1978 |
| Clay reed-mustard | Schoenocrambe argillacea | Threatened | Wherever found | 01-14-1992 |
| Clay's hibiscus | Hibiscus clayi | Endangered | Wherever found | 02-25-1994 |
| Clear Creek gambusia | Gambusia heterochir | Endangered | Wherever found | 03-11-1967 |
| Clouded leopard | Neofelis nebulosa | Endangered | Wherever found | 06-02-1970 |
| Cloven-feathered dove | Drepanoptila holosericea | Endangered | Wherever found | 06-02-1970 |
| Clover (Tidestrom''s) lupine | Lupinus tidestromii | Endangered | Wherever found | 06-22-1992 |
| Clover Valley speckled dace | Rhinichthys osculus oligoporus | Endangered | Wherever found | 10-10-1989 |
| Clubshell | Pleurobema clava | Endangered | Wherever found; Except where listed as Experimental Populations | 01-22-1993 |
| Clubshell | Pleurobema clava | Experimental Population, Non-Essential | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 06-14-2001 |
| Coachella Valley fringe-toed lizard | Uma inornata | Threatened | Wherever found | 09-25-1980 |
| Coachella Valley milk-vetch | Astragalus lentiginosus var. coachellae | Endangered | Wherever found | 10-06-1998 |
| Coastal California gnatcatcher | Polioptila californica californica | Threatened | Wherever found | 03-30-1993 |
| Coastal dunes milk-vetch | Astragalus tener var. titi | Endangered | Wherever found | 08-12-1998 |
| Cobana negra | Stahlia monosperma | Threatened | Wherever found | 04-05-1990 |
| Cochise pincushion cactus | Coryphantha robbinsorum | Threatened | Wherever found | 01-09-1986 |
| Cochito | Phocoena sinus | Endangered | Wherever found | 01-09-1985 |
| Coffin Cave mold beetle | Batrisodes texanus | Endangered | Wherever found | 09-16-1988 |
| Coho salmon | Oncorhynchus (=Salmo) kisutch | Threatened | Southern Oregon - Northern California Coast ESU - See 50 CFR 223.102 | 06-18-1997 |
| Coho salmon | Oncorhynchus (=Salmo) kisutch | Endangered | Central California Coast ESU - See 50 CFR 224.101 | 11-20-1996 |
| Coho salmon | Oncorhynchus (=Salmo) kisutch | Threatened | Oregon Coast ESU - See 50 CFR 223.102 | 04-13-2011 |
| Coho salmon | Oncorhynchus (=Salmo) kisutch | Threatened | Lower Columbia River ESU - See 50 CFR 223.102 | 06-28-2005 |
| Cokendolpher Cave Harvestman | Texella cokendolpheri | Endangered | Wherever found | 12-26-2000 |
| Colorado hookless Cactus | Sclerocactus glaucus | Threatened | Wherever found | 10-11-1979 |
| Colorado pikeminnow | Ptychocheilus lucius | Experimental Population, Non-Essential | Salt and Verde R. drainages, AZ | 07-24-1985 |
| Colorado pikeminnow | Ptychocheilus lucius | Endangered | Wherever found, except where listed as an experimental population | 03-11-1967 |
| Columbian white-tailed deer | Odocoileus virginianus leucurus | Threatened | Columbia River (Clark, Cowliz, Pacific, Skamania, and Wahkiakum Counties, WA., and Clatsop, Columbia, and Multnomah Counties, OR.) | 03-11-1967 |
| Colusa grass | Neostapfia colusana | Threatened | Wherever found | 03-26-1997 |
| Comal Springs dryopid beetle | Stygoparnus comalensis | Endangered | Wherever found | 12-18-1997 |
| Comal Springs riffle beetle | Heterelmis comalensis | Endangered | Wherever found | 12-18-1997 |
| Comanche Springs pupfish | Cyprinodon elegans | Endangered | Wherever found | 03-11-1967 |
| Common caiman | Caiman crocodilus crocodilus | Similarity of Appearance (Threatened) | Wherever found | 05-04-2000 |
| Common Guitarfish | Rhinobatos rhinobatos | Threatened | | |
| Conasauga logperch | Percina jenkinsi | Endangered | Wherever found | 08-05-1985 |
| Conejo dudleya | Dudleya abramsii ssp. parva | Threatened | Wherever found | 01-29-1997 |
| Congo dwarf crocodile | Osteolaemus tetraspis osborni | Endangered | Wherever found | 06-14-1976 |
| Conservancy fairy shrimp | Branchinecta conservatio | Endangered | Wherever found | 09-19-1994 |
| Contra Costa goldfields | Lasthenia conjugens | Endangered | Wherever found | 06-18-1997 |
| Contra Costa wallflower | Erysimum capitatum var. angustatum | Endangered | Wherever found | 05-27-1978 |
| Cooke's koki`o | Kokia cookei | Endangered | Wherever found | 11-29-1979 |
| Cook's holly | Ilex cookii | Endangered | Wherever found | 06-16-1987 |
| Cook's lomatium | Lomatium cookii | Endangered | Wherever found | 11-07-2002 |
| Cooley's meadowrue | Thalictrum cooleyi | Endangered | Wherever found | 02-07-1989 |
| Cooley's water-willow | Justicia cooleyi | Endangered | | 07-27-1989 |
| Coosa moccasinshell | Medionidus parvulus | Endangered | Wherever found | 03-17-1993 |
| Copperbelly water snake | Nerodia erythrogaster neglecta | Threatened | Indiana north of 40 degrees north latitude, Michigan, Ohio | 01-29-1997 |
| Corsican red deer | Cervus elaphus corsicanus | Endangered | Wherever found | 07-27-1979 |
| Corsican swallowtail butterfly | Papilio hospiton | Endangered | Wherever found | 01-14-1993 |
| Costa Rican jatropha | Jatropha costaricensis | Endangered | Wherever found | 07-27-1984 |
| Costa Rican puma | Puma (=Felis) concolor costaricensis | Endangered | Wherever found | 06-14-1976 |
| Cotton-top tamarin | Saguinus oedipus | Endangered | Wherever found | 10-19-1976 |
| Coyote ceanothus | Ceanothus ferrisae | Endangered | Wherever found | 02-03-1995 |
| Cracking pearlymussel | Hemistena lata | Endangered | Wherever found; Except where listed as Experimental Populations | 09-28-1989 |
| Cracking pearlymussel | Hemistena lata | Experimental Population, Non-Essential | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 10-15-2007 |
| Cracking pearlymussel | Hemistena lata | Experimental Population, Non-Essential | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 06-14-2001 |
| Crenulate lead-plant | Amorpha crenulata | Endangered | | 07-18-1985 |
| Crescent nail-tailed wallaby | Onychogalea lunata | Endangered | Wherever found | 12-02-1970 |
| crested honeycreeper (Akohekohe) | Palmeria dolei | Endangered | Wherever found | 03-11-1967 |
| Crimson Hawaiian damselfly | Megalagrion leptodemas | Endangered | Wherever found | 10-18-2012 |
| Cuatro Cienegas softshell turtle | Trionyx ater | Endangered | Wherever found | 06-14-1976 |
| Cuba hook-billed kite | Chondrohierax uncinatus wilsonii | Endangered | Wherever found | 06-02-1970 |
| Cuban crocodile | Crocodylus rhombifer | Endangered | Wherever found | 06-02-1970 |
| Cuban ground iguana | Cyclura nubila nubila | Threatened | Cuba (excludes U.S. Puerto Rico population) | 06-22-1983 |
| Cuban solenodon | Solenodon cubanus | Endangered | Wherever found | 06-02-1970 |
| Cuba sandhill crane | Grus canadensis nesiotes | Endangered | Wherever found | 06-14-1976 |
| Cui-ui | Chasmistes cujus | Endangered | Wherever found | 03-11-1967 |
| Culebra Island giant anole | Anolis roosevelti | Endangered | Wherever found | 08-22-1977 |
| Cumberland bean (pearlymussel) | Villosa trabalis | Experimental Population, Non-Essential | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 06-14-2001 |
| Cumberland bean (pearlymussel) | Villosa trabalis | Endangered | Wherever found; Except where listed as Experimental Populations | 06-14-1976 |
| Cumberland bean (pearlymussel) | Villosa trabalis | Experimental Population, Non-Essential | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 10-15-2007 |
| Cumberland darter | Etheostoma susanae | Endangered | Wherever found | 09-08-2011 |
| Cumberland elktoe | Alasmidonta atropurpurea | Endangered | Wherever found | 01-10-1997 |
| Cumberlandian combshell | Epioblasma brevidens | Experimental Population, Non-Essential | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 06-14-2001 |
| Cumberlandian combshell | Epioblasma brevidens | Endangered | Wherever found; Except where listed as Experimental Populations | 01-10-1997 |
| Cumberlandian combshell | Epioblasma brevidens | Experimental Population, Non-Essential | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 10-15-2007 |
| Cumberland monkeyface (pearlymussel) | Theliderma intermedia | Experimental Population, Non-Essential | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 06-14-2001 |
| Cumberland monkeyface (pearlymussel) | Theliderma intermedia | Endangered | Wherever found; Except where listed as Experimental Populations | 06-14-1976 |
| Cumberland monkeyface (pearlymussel) | Theliderma intermedia | Experimental Population, Non-Essential | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 10-15-2007 |
| Cumberland pigtoe | Pleuronaia gibber | Endangered | Wherever found | 05-07-1991 |
| Cumberland rosemary | Conradina verticillata | Threatened | Wherever found | 11-29-1991 |
| Curtis pearlymussel | Epioblasma florentina curtisii | Endangered | Wherever found | 06-14-1976 |
| Cushenbury buckwheat | Eriogonum ovalifolium var. vineum | Endangered | Wherever found | 08-24-1994 |
| Cushenbury milk-vetch | Astragalus albens | Endangered | Wherever found | 08-24-1994 |
| Cushenbury oxytheca | Oxytheca parishii var. goodmaniana | Endangered | Wherever found | 08-24-1994 |
| Cylindrical lioplax (snail) | Lioplax cyclostomaformis | Endangered | Wherever found | 10-28-1998 |
| Daggernose Shark | Isogomphodon oxyrhynchus | Endangered | | |
| Dakota Skipper | Hesperia dacotae | Threatened | Wherever found | 11-24-2014 |
| Dama gazelle | Gazella dama | Endangered | Wherever found | 09-02-2005 |
| Dappled mountain robin | Arcanator orostruthus | Threatened | Wherever found | 01-12-1995 |
| Dark pigtoe | Pleurobema furvum | Endangered | Wherever found | 03-17-1993 |
| Davis' green pitaya | Echinocereus viridiflorus var. davisii | Endangered | Wherever found | 12-08-1979 |
| Day gecko | Phelsuma edwardnewtoni | Endangered | Wherever found | 06-02-1970 |
| DeBeque phacelia | Phacelia submutica | Threatened | Wherever found | 08-26-2011 |
| Decurrent false aster | Boltonia decurrens | Threatened | Wherever found | 11-14-1988 |
| Delhi Sands flower-loving fly | Rhaphiomidas terminatus abdominalis | Endangered | Wherever found | 09-23-1993 |
| Del Mar manzanita | Arctostaphylos glandulosa ssp. crassifolia | Endangered | Wherever found | 10-07-1996 |
| Delta green ground beetle | Elaphrus viridis | Threatened | Wherever found | 08-08-1980 |
| Delta smelt | Hypomesus transpacificus | Threatened | Wherever found | 03-05-1993 |
| Deltoid spurge | Chamaesyce deltoidea ssp. deltoidea | Endangered | | 07-18-1985 |
| Desert bandicoot | Perameles eremiana | Endangered | Wherever found | 06-04-1973 |
| Desert dace | Eremichthys acros | Threatened | Wherever found | 03-11-1967 |
| Desert monitor | Varanus griseus | Endangered | Wherever found | 06-14-1976 |
| Desert (=plain) rat-kangaroo | Caloprymnus campestris | Endangered | Wherever found | 12-02-1970 |
| Desert pupfish | Cyprinodon macularius | Endangered | Wherever found | 03-31-1986 |
| Desert slender salamander | Batrachoseps aridus | Endangered | Wherever found | 06-04-1973 |
| Desert tortoise | Gopherus agassizii | Similarity of Appearance (Threatened) | AZ south and east of Colorado R., and Mexico, when found outside of Mexico or said range in AZ | 04-02-1990 |
| Desert tortoise | Gopherus agassizii | Threatened | Wherever found, except AZ south and east of Colorado R., and Mexico | 04-02-1990 |
| Desert yellowhead | Yermo xanthocephalus | Threatened | Wherever found | 03-14-2002 |
| Devils Hole pupfish | Cyprinodon diabolis | Endangered | Wherever found | 03-11-1967 |
| Devils River minnow | Dionda diaboli | Threatened | Wherever found | 10-20-1999 |
| Dhole | Cuon alpinus | Endangered | Wherever found | 06-02-1970 |
| diamond Darter | Crystallaria cincotta | Endangered | Wherever found | 08-26-2013 |
| Diamond Head schiedea | Schiedea adamantis | Endangered | Wherever found | 02-17-1984 |
| Diamond Tryonia | Pseudotryonia adamantina | Endangered | Wherever found | 07-09-2013 |
| Diana monkey | Cercopithecus diana | Endangered | Wherever found | 10-19-1976 |
| Dibbler | Antechinus apicalis | Endangered | Wherever found | 12-02-1970 |
| Diminutive Amphipod | Gammarus hyalleloides | Endangered | Wherever found | 07-09-2013 |
| Dixie Valley Toad | Anaxyrus williamsi | Endangered | | 12-02-2022 |
| Djibouti francolin | Francolinus ochropectus | Endangered | Wherever found | 01-12-1995 |
| Dolphin and Union caribou | Rangifer tarandus ssp. groenlandicus x pearyi | Endangered | Wherever found | 01-12-2023 |
| Douc langur | Pygathrix nemaeus | Endangered | Wherever found | 06-02-1970 |
| Drill | Mandrillus (=Papio) leucophaeus | Endangered | Wherever found | 10-19-1976 |
| Dromedary pearlymussel | Dromus dromas | Endangered | Wherever found; Except where listed as Experimental Populations | 06-14-1976 |
| Dromedary pearlymussel | Dromus dromas | Experimental Population, Non-Essential | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 10-15-2007 |
| Dromedary pearlymussel | Dromus dromas | Experimental Population, Non-Essential | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 06-14-2001 |
| Dudley Bluffs bladderpod | Lesquerella congesta | Threatened | Wherever found | 02-06-1990 |
| Dudley Bluffs twinpod | Physaria obcordata | Threatened | Wherever found | 02-06-1990 |
| Dugong | Dugong dugon | Endangered | Wherever found | 12-02-1970 |
| dusky gopher frog | Rana sevosa | Endangered | Wherever found | 12-04-2001 |
| Dusky sea snake | Aipysurus fuscus | Endangered | | 11-06-2015 |
| Duskytail darter | Etheostoma percnurum | Experimental Population, Non-Essential | The Tellico River, between the backwaters of the Tellico Reservoir (approximately Tellico River mile 19 (30.4 kilometers) and Tellico River mile 33 (52.8 kilometers), near the Tellico Ranger Station, Monroe County, Tennessee. | 08-12-2002 |
| Duskytail darter | Etheostoma percnurum | Endangered | Wherever found | 04-27-1993 |
| Duskytail darter | Etheostoma percnurum | Experimental Population, Non-Essential | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.84(q)(1)(ii)) | 10-15-2007 |
| Dwarf Bear-poppy | Arctomecon humilis | Endangered | Wherever found | 12-06-1979 |
| Dwarf-flowered heartleaf | Hexastylis naniflora | Threatened | Wherever found | 04-14-1989 |
| Dwarf hutia | Capromys nana | Endangered | Wherever found | 05-16-1986 |
| Dwarf iliau | Wilkesia hobdyi | Endangered | Wherever found | 06-22-1992 |
| Dwarf lake iris | Iris lacustris | Threatened | Wherever found | 09-28-1988 |
| Dwarf naupaka | Scaevola coriacea | Endangered | Wherever found | 05-16-1986 |
| Dwarf sawfish | Pristis clavata | Endangered | Wherever found | 01-12-2015 |
| Dwarf wedgemussel | Alasmidonta heterodon | Endangered | Wherever found | 03-14-1990 |
| Eastern Black rail | Laterallus jamaicensis ssp. jamaicensis | Threatened | Wherever found | 11-09-2020 |
| Eastern Hellbender | Cryptobranchus alleganiensis alleganiensis | Endangered | Missouri DPS | 04-07-2021 |
| Eastern indigo snake | Drymarchon couperi | Threatened | Wherever found | 03-03-1978 |
| Eastern jerboa marsupial | Antechinomys laniger | Endangered | Wherever found | 12-02-1970 |
| Eastern Massasauga (=rattlesnake) | Sistrurus catenatus | Threatened | Wherever found | 09-30-2016 |
| Eastern native-cat | Dasyurus viverrinus | Endangered | Wherever found | 06-04-1973 |
| Eastern prairie fringed orchid | Platanthera leucophaea | Threatened | Wherever found | 09-28-1989 |
| Easy yellow-faced bee | Hylaeus facilis | Endangered | Wherever found | 10-31-2016 |
| Edward's pheasant | Lophura edwardsi | Endangered | Wherever found | 06-02-1970 |
| Egyptian Tortoise | Testudo kleinmanni | Threatened | Wherever found | 05-01-2023 |
| Eiao Marquesas reed-Warbler | Acrocephalus percernis aquilonis | Endangered | Wherever found | 09-12-2011 |
| El Dorado bedstraw | Galium californicum ssp. sierrae | Endangered | Wherever found | 10-18-1996 |
| Eld's brow-antlered Deer | Cervus eldi | Endangered | Wherever found | 06-02-1970 |
| Elfin tree fern | Cyathea dryopteroides | Endangered | Wherever found | 06-16-1987 |
| Elfin-woods warbler | Setophaga angelae | Threatened | Wherever found | 07-22-2016 |
| Elkhorn coral | Acropora palmata | Threatened | Wherever found | 06-08-2006 |
| Elliot's pheasant | Syrmaticus ellioti | Endangered | Wherever found | 06-14-1976 |
| El Segundo blue butterfly | Euphilotes battoides allyni | Endangered | Wherever found | 06-08-1976 |
| emperor penguin | Aptenodytes forsteri | Threatened | Wherever found | 11-25-2022 |
| `Ena`ena | Pseudognaphalium sandwicensium var. molokaiense | Endangered | Wherever found | 10-31-2016 |
| Encinitas baccharis | Baccharis vanessae | Threatened | Wherever found | 10-07-1996 |
| erect-crested penguin | Eudyptes sclateri | Threatened | Wherever found | 09-02-2010 |
| Erubia | Solanum drymophilum | Endangered | Wherever found | 08-26-1988 |
| Eskimo curlew | Numenius borealis | Endangered | Wherever found | 03-11-1967 |
| Esmeraldas woodstar | Chaetocercus berlepschi | Endangered | Wherever found | 11-29-2013 |
| Etonia rosemary | Conradina etonia | Endangered | | 07-12-1993 |
| Etowah darter | Etheostoma etowahae | Endangered | Wherever found | 12-20-1994 |
| Eulachon | Thaleichthys pacificus | Threatened | Southern DPS - See 50 CFR 223.102 | 04-13-2011 |
| Euler's flycatcher | Empidonax euleri johnstonei | Endangered | Wherever found | 06-02-1970 |
| Eurasian peregrine falcon | Falco peregrinus peregrinus | Endangered | Wherever found | 06-14-1976 |
| Eureka Dune grass | Swallenia alexandrae | Threatened | | 05-27-1978 |
| European sturgeon | Acipenser sturio | Endangered | Wherever found | 09-04-2014 |
| Everglades bully | Sideroxylon reclinatum ssp. austrofloridense | Threatened | | 10-06-2017 |
| Everglade snail kite | Rostrhamus sociabilis plumbeus | Endangered | Wherever found | 03-11-1967 |
| Ewa Plains `akoko | Euphorbia skottsbergii var. skottsbergii | Endangered | Wherever found | 08-24-1982 |
| Exuma Island iguana | Cyclura cychlura figginsi | Threatened | Wherever found | 06-22-1983 |
| Eyrean grasswren (flycatcher) | Amytornis goyderi | Endangered | Wherever found | 06-02-1970 |
| Fadang | Cycas micronesica | Threatened | Wherever found | 11-02-2015 |
| false killer whale | Pseudorca crassidens | Endangered | Main Hawaiian Islands Insular DPS See 50 CFR 224.101 | 12-28-2012 |
| False water rat | Xeromys myoides | Endangered | Wherever found | 12-02-1970 |
| Fanshell | Cyprogenia stegaria | Endangered | Wherever found | 06-21-1990 |
| Fanshell | Cyprogenia stegaria | Experimental Population, Non-Essential | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 10-15-2007 |
| Fassett's locoweed | Oxytropis campestris var. chartacea | Threatened | Wherever found | 09-28-1988 |
| Fat pocketbook | Potamilus capax | Endangered | Wherever found | 06-14-1976 |
| Fat threeridge (mussel) | Amblema neislerii | Endangered | Wherever found | 03-16-1998 |
| Fea's muntjac | Muntiacus feae | Endangered | Wherever found | 07-27-1979 |
| Fender's blue butterfly | Icaricia icarioides fenderi | Threatened | Wherever found | 01-25-2000 |
| Few-flowered navarretia | Navarretia leucocephala ssp. pauciflora (=N. pauciflora) | Endangered | Wherever found | 06-18-1997 |
| Fickeisen plains cactus | Pediocactus peeblesianus ssp. fickeiseniae | Endangered | Wherever found | 10-31-2013 |
| Field's mouse | Pseudomys fieldi | Endangered | Wherever found | 12-02-1970 |
| Fiji banded iguana | Brachylophus fasciatus | Endangered | Wherever found | 03-20-1980 |
| Fiji crested iguana | Brachylophus vitiensis | Endangered | Wherever found | 03-20-1980 |
| Fiji petrel | Pseudobulweria macgillivrayi | Endangered | Wherever found | 09-14-2009 |
| Finback whale | Balaenoptera physalus | Endangered | Wherever found | 06-02-1970 |
| Finelined pocketbook | Hamiota altilis | Threatened | Wherever found | 03-17-1993 |
| Finerayed pigtoe | Fusconaia cuneolus | Experimental Population, Non-Essential | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 06-14-2001 |
| Finerayed pigtoe | Fusconaia cuneolus | Endangered | Wherever found; Except where listed as Experimental Populations | 06-14-1976 |
| Finerayed pigtoe | Fusconaia cuneolus | Experimental Population, Non-Essential | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 10-15-2007 |
| fiordland crested penguin | Eudyptes pachyrhynchus | Threatened | Wherever found | 09-02-2010 |
| Fisher | Pekania pennanti | Endangered | Southern Sierra Nevada Distinct Population Segment | 06-15-2020 |
| Fish Slough milk-vetch | Astragalus lentiginosus var. piscinensis | Threatened | Wherever found | 10-06-1998 |
| Flat-headed cat | Prionailurus (=Felis) planiceps | Endangered | Wherever found | 06-14-1976 |
| Flat pebblesnail | Lepyrium showalteri | Endangered | Wherever found | 10-28-1998 |
| Flat pigtoe | Pleurobema marshalli | Endangered | Wherever found | 04-07-1987 |
| Flat-spired three-toothed Snail | Triodopsis platysayoides | Threatened | Wherever found | 08-02-1978 |
| Flattened musk turtle | Sternotherus depressus | Threatened | Black Warrior R. system upstream from Bankhead Dam | 06-11-1987 |
| Fleshy-fruit gladecress | Leavenworthia crassa | Endangered | Wherever found | 08-01-2014 |
| Fleshy owl's-clover | Castilleja campestris ssp. succulenta | Threatened | Wherever found | 03-26-1997 |
| Floreana tree-Finch | Camarhynchus pauper | Endangered | Wherever found | 08-26-2010 |
| Florida bonamia | Bonamia grandiflora | Threatened | | 11-02-1987 |
| Florida bonneted bat | Eumops floridanus | Endangered | Wherever found | 11-01-2013 |
| Florida brickell-bush | Brickellia mosieri | Endangered | | 10-06-2014 |
| Florida bristle fern | Trichomanes punctatum ssp. floridanum | Endangered | | 11-05-2015 |
| Florida golden aster | Chrysopsis floridana | Endangered | | 05-16-1986 |
| Florida grasshopper sparrow | Ammodramus savannarum floridanus | Endangered | Wherever found | 07-31-1986 |
| Florida leafwing Butterfly | Anaea troglodyta floridalis | Endangered | Wherever found | 09-11-2014 |
| Florida panther | Puma (=Felis) concolor coryi | Endangered | Wherever found | 03-11-1967 |
| Florida perforate cladonia | Cladonia perforata | Endangered | | 04-27-1993 |
| Florida pineland crabgrass | Digitaria pauciflora | Threatened | | 10-06-2017 |
| Florida prairie-clover | Dalea carthagenensis floridana | Endangered | | 10-06-2017 |
| Florida salt marsh vole | Microtus pennsylvanicus dukecampbelli | Endangered | Wherever found | 01-14-1991 |
| Florida scrub-jay | Aphelocoma coerulescens | Threatened | Wherever found | 06-03-1987 |
| Florida semaphore Cactus | Consolea corallicola | Endangered | | 11-25-2013 |
| Florida skullcap | Scutellaria floridana | Threatened | | 05-08-1992 |
| Florida torreya | Torreya taxifolia | Endangered | | 01-23-1984 |
| Florida ziziphus | Ziziphus celata | Endangered | | 07-27-1989 |
| Fluted kidneyshell | Ptychobranchus subtentus | Endangered | Wherever found | 10-28-2013 |
| Flying earwig Hawaiian damselfly | Megalagrion nesiotes | Endangered | Wherever found | 07-26-2010 |
| Forbes' parakeet | Cyanoramphus auriceps forbesi | Endangered | Wherever found | 06-02-1970 |
| Formosan rock macaque | Macaca cyclopis | Threatened | Wherever found | 10-19-1976 |
| Formosan sika deer | Cervus nippon taiouanus | Endangered | Wherever found | 07-27-1979 |
| Formosan yellow-throated marten | Martes flavigula chrysospila | Endangered | Wherever found | 06-02-1970 |
| Fosberg's love grass | Eragrostis fosbergii | Endangered | Wherever found | 10-10-1996 |
| Fountain darter | Etheostoma fonticola | Endangered | Wherever found | 10-13-1970 |
| Fountain thistle | Cirsium fontinale var. fontinale | Endangered | Wherever found | 02-03-1995 |
| Four-petal pawpaw | Asimina tetramera | Endangered | | 09-26-1986 |
| Fragile tree snail | Samoana fragilis | Endangered | Wherever found | 11-02-2015 |
| Fragrant prickly-apple | Cereus eriophorus var. fragrans | Endangered | | 11-01-1985 |
| Franciscan manzanita | Arctostaphylos franciscana | Endangered | Wherever found | 10-05-2012 |
| Francois' langur | Trachypithecus (=Presbytis) francoisi | Endangered | Wherever found | 10-19-1976 |
| Franklin's bumble bee | Bombus franklini | Endangered | Wherever found | 09-23-2021 |
| Frecklebelly madtom | Noturus munitus | Threatened | Upper Coosa River Distinct Population Segment | 04-03-2023 |
| Freira | Pterodroma madeira | Endangered | Wherever found | 01-12-1995 |
| Fresno kangaroo rat | Dipodomys nitratoides exilis | Endangered | Wherever found | 01-30-1985 |
| Friendly Ground-Dove | Gallicolumba stairi | Endangered | American Samoa DPS | 10-24-2016 |
| Fringe-backed fire-eye | Pyriglena atra | Endangered | Wherever found | 01-27-2011 |
| Fringed campion | Silene polypetala | Endangered | Wherever found | 01-18-1991 |
| Fringed Ornamental Tarantula | Poecilotheria ornata | Endangered | Wherever found | 08-30-2018 |
| Frosted Flatwoods salamander | Ambystoma cingulatum | Threatened | Wherever found | 04-01-1999 |
| Furbish lousewort | Pedicularis furbishiae | Endangered | Wherever found | 05-27-1978 |
| Fuzzy pigtoe | Pleurobema strodeanum | Threatened | Wherever found | 10-10-2012 |
| Gaimard's rat-kangaroo | Bettongia gaimardi | Endangered | Wherever found | 06-04-1973 |
| Galapagos hawk | Buteo galapagoensis | Endangered | Wherever found | 06-02-1970 |
| Galapagos penguin | Spheniscus mendiculus | Endangered | Wherever found | 06-02-1970 |
| Galapagos petrel | Pterodroma phaeopygia | Threatened | Wherever found | 01-05-2010 |
| Galapagos tortoise | Geochelone nigra (=elephantopus) | Endangered | Wherever found | 06-02-1970 |
| Gambel's watercress | Rorippa gambellii | Endangered | Wherever found | 08-03-1993 |
| Garber's spurge | Chamaesyce garberi | Threatened | | 07-18-1985 |
| Garrett's mint | Dicerandra christmanii | Endangered | | 11-01-1985 |
| Gavial | Gavialis gangeticus | Endangered | Wherever found | 06-02-1970 |
| Gaviota Tarplant | Deinandra increscens ssp. villosa | Endangered | Wherever found | 03-20-2000 |
| Gelada baboon | Theropithecus gelada | Threatened | Wherever found | 10-19-1976 |
| Gentian pinkroot | Spigelia gentianoides | Endangered | | 11-26-1990 |
| Gentner's Fritillary | Fritillaria gentneri | Endangered | Wherever found | 12-10-1999 |
| Geometric turtle | Psammobates geometricus | Endangered | Wherever found | 06-14-1976 |
| Georgetown Salamander | Eurycea naufragia | Threatened | Wherever found | 03-26-2014 |
| Georgia pigtoe | Pleurobema hanleyianum | Endangered | Wherever found | 12-02-2010 |
| Georgia rockcress | Arabis georgiana | Threatened | Wherever found | 10-14-2014 |
| Giant armadillo | Priodontes maximus | Endangered | Wherever found | 06-14-1976 |
| Giant garter snake | Thamnophis gigas | Threatened | Wherever found | 10-20-1993 |
| Giant ibis | Pseudibis gigantea | Endangered | Wherever found | 01-16-2008 |
| Giant kangaroo rat | Dipodomys ingens | Endangered | Wherever found | 01-05-1987 |
| Giant Manta Ray | Manta birostris | Threatened | | |
| Giant otter | Pteronura brasiliensis | Endangered | South America | 06-02-1970 |
| Giant panda | Ailuropoda melanoleuca | Endangered | Wherever found | 01-23-1984 |
| Giant sable antelope | Hippotragus niger variani | Endangered | Wherever found | 06-02-1970 |
| Giant scops owl | Mimizuku (=Otus) gurneyi | Endangered | Wherever found | 06-14-1976 |
| Gibbons | Hylobates spp. (including Nomascus) | Endangered | Wherever found | 06-02-1970 |
| Gierisch mallow | Sphaeralcea gierischii | Endangered | Wherever found | 09-12-2013 |
| Gila chub | Gila intermedia | Endangered | Wherever found | 11-02-2005 |
| Gila topminnow (incl. Yaqui) | Poeciliopsis occidentalis | Endangered | U.S. Only | 03-11-1967 |
| Gila trout | Oncorhynchus gilae | Threatened | Wherever found | 03-11-1967 |
| Glaucous macaw | Anodorhynchus glaucus | Endangered | Wherever found | 06-14-1976 |
| Godfrey's butterwort | Pinguicula ionantha | Threatened | | 07-12-1993 |
| Goeldi's marmoset | Callimico goeldii | Endangered | Wherever found | 06-02-1970 |
| golden-cheeked warbler | Setophaga chrysoparia | Endangered | Wherever found | 05-04-1990 |
| Golden conure | Aratinga guarouba | Threatened | Wherever found | 05-26-2020 |
| Golden coqui | Eleutherodactylus jasperi | Threatened | Wherever found | 11-11-1977 |
| Golden langur | Trachypithecus (=Presbytis) geei | Endangered | Wherever found | 06-14-1976 |
| golden paintbrush | Castilleja levisecta | Threatened | Wherever found | 06-11-1997 |
| Golden-rumped tamarin | Leontopithecus spp. | Endangered | Wherever found | 06-02-1970 |
| Golden sedge | Carex lutea | Endangered | Wherever found | 01-23-2002 |
| Golden-shouldered parakeet | Psephotus chrysopterygius | Endangered | Wherever found | 06-02-1970 |
| Goldline darter | Percina aurolineata | Threatened | Wherever found | 04-22-1992 |
| Goliath Frog | Conraua goliath | Threatened | Wherever found | 12-08-1994 |
| Gonzales tryonia | Tryonia circumstriata (=stocktonensis) | Endangered | Wherever found | 07-09-2013 |
| Gopher tortoise | Gopherus polyphemus | Threatened | Western DPS | 07-07-1987 |
| Goral | Naemorhedus goral | Endangered | Wherever found | 06-14-1976 |
| Gorgeted wood-quail | Odontophorus strophium | Endangered | Wherever found | 11-29-2013 |
| Gorilla | Gorilla gorilla | Endangered | Wherever found | 06-02-1970 |
| Gould's mouse | Pseudomys gouldii | Endangered | Wherever found | 06-04-1973 |
| Government Canyon Bat Cave meshweaver | Cicurina vespera | Endangered | Wherever found | 12-26-2000 |
| Government Canyon Bat Cave spider | Tayshaneta microps | Endangered | Wherever found | 12-26-2000 |
| Gowen cypress | Cupressus goveniana ssp. goveniana | Threatened | Wherever found | 08-12-1998 |
| Grand Cayman ground iguana | Cyclura lewisi | Endangered | Wherever found | 06-22-1983 |
| Gray bat | Myotis grisescens | Endangered | Wherever found | 04-28-1976 |
| Gray (=entellus) langur | Semnopithecus (=Presbytis) entellus | Endangered | Wherever found | 06-14-1976 |
| Gray whale | Eschrichtius robustus | Endangered | Western North Pacific DPS See 50 CFR 224.101 | 06-02-1970 |
| Gray wolf | Canis lupus | Endangered | U.S.A.: All of AL, AR, CA, CO, CT, DE, FL, GA, IA, IN, IL, KS, KY, LA, MA, MD, ME, MI, MO, MS, NC, ND, NE, NH, NJ, NV, NY, OH, OK, PA, RI, SC, SD, TN, TX, VA, VT, WI, and WV; and portions of AZ, NM, OR, UT, and WA as follows: (1) Northern AZ (that portion north of the centerline of Interstate Highway 40); (2) Northern NM (that portion north of the centerline of Interstate Highway 40); (3) Western OR (that portion of OR west of the centerline of Highway 395 and Highway 78 north of Burns Junction and that portion of OR west of the centerline of Highway 95 south of Burns Junction); (4) Most of Utah (that portion of UT south and west of the centerline of Highway 84 and that portion of UT south of Highway 80 from Echo to the UT/WY Stateline); and (5) Western WA (that portion of WA west of the centerline of Highway 97 and Highway 17 north of Mesa and that portion of WA west of the centerline of Highway 395 south of Mesa). Mexico. | 03-09-1978 |
| Gray wolf | Canis lupus | Threatened | U.S.A. (MN) | 03-09-1978 |
| Greater adjutant | Leptoptilos dubius | Endangered | Wherever found | 09-12-2011 |
| Great green macaw | Ara ambiguus | Endangered | Wherever found | 11-02-2015 |
| Great Indian bustard | Ardeotis (=Choriotis) nigriceps | Endangered | Wherever found | 06-02-1970 |
| Great Indian rhinoceros | Rhinoceros unicornis | Endangered | Nepal, India | 12-02-1970 |
| Greenback Cutthroat trout | Oncorhynchus clarkii stomias | Threatened | Wherever found | 03-11-1967 |
| Green blossom (pearlymussel) | Epioblasma torulosa gubernaculum | Endangered | Wherever found | 06-14-1976 |
| Greene's tuctoria | Tuctoria greenei | Endangered | Wherever found | 03-26-1997 |
| Greenland white-tailed eagle | Haliaeetus albicilla groenlandicus | Endangered | Wherever found | 06-14-1976 |
| Green pitcher-plant | Sarracenia oreophila | Endangered | Wherever found | 10-21-1979 |
| Green sawfish | Pristis zijsron | Endangered | Wherever found | 01-12-2015 |
| Green sea turtle | Chelonia mydas | Endangered | Green sea turtles originating from the Central West Pacific Ocean, bounded by the following coordinates: 41 degrees N., 146 degrees E. in the northwest; 41 degrees N., 169 degrees E. in the northeast; 9 degrees N., 175 degrees W. in the east; 13 degrees S., 171 degrees E. in the southeast; along the northern coast of the island of New Guinea; and 4.5 degrees N., 129 degrees E. in the west | 05-06-2016 |
| Green sea turtle | Chelonia mydas | Threatened | Green sea turtles originating from the South Atlantic Ocean, bounded by the following lines and coordinates: along the northern and eastern coasts of South America (east of 7.5 degrees N., 77 degrees W.); 14 degrees N., 77 degrees W. to 14 degrees N., 65.1 degrees W. to 19 degrees N., 65.1 degrees W. in the north and west; 19 degrees N. Lat. in the northeast; 40 degrees S., 19 degrees E. in the southeast; and 40 degrees S. Lat. in the south | 05-06-2016 |
| Green sea turtle | Chelonia mydas | Threatened | Green sea turtles originating from the Southwest Pacific Ocean, bounded by the following lines and coordinates: along the southern coast of the island of New Guinea and the Torres Strait (east of 142 degrees E Long.); 13 degrees S., 171 degrees E. in the northeast; 40 degrees S., 176 degrees E. in the southeast; and 40 degrees S., 142 degrees E. in the southwest | 05-06-2016 |
| Green sea turtle | Chelonia mydas | Threatened | Green sea turtles originating from the Central North Pacific Ocean, bounded by the following coordinates: 41 degrees N., 169 degrees E. in the northwest; 41 degrees N., 143 degrees W. in the northeast; 9 degrees N., 125 degrees W. in the southeast; and 9 degrees N., 175 degrees W. in the southwest Pacific coast of Mexico | 05-06-2016 |
| Green sea turtle | Chelonia mydas | Endangered | Green sea turtles originating from the Central South Pacific Ocean, bounded by the following coordinates: 9 degrees N., 175 degrees W. in the northwest; 9 degrees N., 125 degrees W. in the northeast; 40 degrees S., 96 degrees W. in the southeast; 40 degrees S., 176 degrees E. in the southwest; and 13 degrees S., 171 degrees E. in the west | 05-06-2016 |
| Green sea turtle | Chelonia mydas | Endangered | Green sea turtles originating from the Mediterranean Sea, bounded by 5.5 degrees W. Long. in the west | 05-06-2016 |
| Green sea turtle | Chelonia mydas | Threatened | Green sea turtles originating from the Eastern Indian and Western Pacific Oceans, bounded by the following lines and coordinates: 41 degrees N. Lat. in the north, 41 degrees N., 146 degrees E. in the northeast; 4.5 degrees N., 129 degrees E. in the southeast; along the southern coast of the island of New Guinea; along the western coast of Australia (west of 142 degrees E. Long.); 40 degrees S. Lat. in the south; and 84 degrees E. Long. in the east | 05-06-2016 |
| Green sea turtle | Chelonia mydas | Threatened | Green sea turtles originating from the North Atlantic Ocean, bounded by the following lines and coordinates: 48 degrees N. Lat. in the north, along the western coasts of Europe and Africa (west of 5.5 degrees W. Long.); north of 19 degrees N. Lat. in the east; bounded by 19 degrees N., 65.1 degrees W. to 14 degrees N., 65.1 degrees W. then 14 degrees N., 77 degrees W. in the south and west; and along the eastern coasts of the Americas (north of 7.5 degrees N., 77 degrees W.) | 05-06-2016 |
| Green sea turtle | Chelonia mydas | Threatened | Green sea turtles originating from the Southwest Indian Ocean, bounded by the following lines: the equator to the north; 84 degrees E. Long. to the east; 40 degrees S. Lat. to the south; and 19 degrees E. Long (and along the eastern coast of Africa) in the west | 05-06-2016 |
| Green sea turtle | Chelonia mydas | Threatened | Green sea turtles originating from the East Pacific Ocean, bounded by the following lines and coordinates: 41 degrees N., 143 degrees W. in the northwest; 41 degrees N. Lat. in the north; along the western coasts of the Americas; 40 degrees S. Lat. in the south; and 40 degrees S., 96 degrees W. in the southwest | 05-06-2016 |
| Green sea turtle | Chelonia mydas | Threatened | Green sea turtles originating from the North Indian Ocean, bounded by: Africa and Asia in the west and north; 84 degrees E. Long. in the east; and the equator in the south | 05-06-2016 |
| green sturgeon | Acipenser medirostris | Threatened | Southern DPS - See 50 CFR 223.102 | 06-06-2006 |
| Grenada gray-fronted dove | Leptotila rufaxilla wellsi | Endangered | Wherever found | 06-02-1970 |
| Grenada hook-billed kite | Chondrohierax uncinatus mirus | Endangered | Wherever found | 06-02-1970 |
| Grevy's zebra | Equus grevyi | Threatened | Wherever found | 09-20-1979 |
| Grey-necked rockfowl | Picathartes oreas | Endangered | Wherever found | 06-02-1970 |
| Grizzly bear | Ursus arctos horribilis | Threatened | U.S.A., conterminous (lower 48) States, except where listed as an experimental population | 07-28-1975 |
| Grotto Sculpin | Cottus specus | Endangered | Wherever found | 10-25-2013 |
| Ground parrot | Pezoporus wallicus | Endangered | Wherever found | 06-04-1973 |
| Guadalupe fescue | Festuca ligulata | Endangered | Wherever found | 10-10-2017 |
| Guadalupe fur seal | Arctocephalus townsendi | Threatened | Wherever found | 03-11-1967 |
| Guadeloupe house wren | Troglodytes aedon guadeloupensis | Endangered | Wherever found | 06-02-1970 |
| Guajon | Eleutherodactylus cooki | Threatened | Wherever found | 06-11-1997 |
| Guam Micronesian kingfisher | Halcyon cinnamomina cinnamomina | Experimental Population, Non-Essential | | 05-04-2023 |
| Guam Micronesian kingfisher | Halcyon cinnamomina cinnamomina | Endangered | Wherever found | 08-27-1984 |
| Guam rail | Rallus owstoni | Endangered | Wherever found, except where listed as an experimental population | 04-11-1984 |
| Guam rail | Rallus owstoni | Experimental Population, Non-Essential | Rota | 10-30-1989 |
| Guam tree snail | Partula radiolata | Endangered | Wherever found | 11-02-2015 |
| Guatemalan Fir (=pinabete) | Abies guatemalensis | Threatened | Wherever found | 12-10-1979 |
| Guatemalan jaguarundi | Herpailurus (=Felis) yagouaroundi fossata | Endangered | Mexico,Nicaragua | 06-14-1976 |
| Guizhou snub-nosed monkey | Rhinopithecus brelichi | Endangered | Wherever found | 09-27-1990 |
| Gulf Coast jaguarundi | Puma yagouaroundi cacomitli | Endangered | Wherever found | 06-14-1976 |
| Gulf Grouper | Mycteroperca jordani | Endangered | | |
| Gulf moccasinshell | Medionidus penicillatus | Endangered | Wherever found | 03-16-1998 |
| Gulf of Mexico Bryde's Whale | Balaenoptera edeni | Endangered | | |
| Gulf sturgeon | Acipenser oxyrinchus (=oxyrhynchus) desotoi | Threatened | Wherever found | 09-30-1991 |
| Gunnison sage-grouse | Centrocercus minimus | Threatened | Wherever found | 12-22-2014 |
| Gurney's pitta | Pitta gurneyi | Endangered | Wherever found | 01-16-2008 |
| Guthrie's (=Pyne's) ground-plum | Astragalus bibullatus | Endangered | Wherever found | 09-26-1991 |
| Guyandotte River crayfish | Cambarus veteranus | Endangered | Wherever found | 05-09-2016 |
| Gypsum wild-buckwheat | Eriogonum gypsophilum | Threatened | Wherever found | 01-19-1981 |
| haha | Cyanea crispa | Endangered | Wherever found | 03-28-1994 |
| haha | Cyanea dunbariae | Endangered | Wherever found | 10-10-1996 |
| haha | Cyanea duvalliorum | Endangered | Wherever found | 06-27-2013 |
| haha | Cyanea gibsonii | Endangered | Wherever found | 09-20-1991 |
| haha | Cyanea magnicalyx | Endangered | Wherever found | 06-27-2013 |
| haha | Cyanea maritae | Endangered | Wherever found | 06-27-2013 |
| haha | Cyanea mauiensis | Endangered | Wherever found | 06-27-2013 |
| haha | Cyanea munroi | Endangered | Wherever found | 06-27-2013 |
| Haha | Cyanea acuminata | Endangered | Wherever found | 10-10-1996 |
| Haha | Cyanea asarifolia | Endangered | Wherever found | 02-25-1994 |
| Haha | Cyanea asplenifolia | Endangered | Wherever found | 06-27-2013 |
| Haha | Cyanea calycina | Endangered | Wherever found | 10-18-2012 |
| Haha | Cyanea copelandii ssp. copelandii | Endangered | Wherever found | 03-04-1994 |
| Haha | Cyanea copelandii ssp. haleakalaensis | Endangered | Wherever found | 09-03-1999 |
| Haha | Cyanea dolichopoda | Endangered | Wherever found | 05-13-2010 |
| Haha | Cyanea eleeleensis | Endangered | Wherever found | 05-13-2010 |
| Haha | Cyanea glabra | Endangered | Wherever found | 09-03-1999 |
| Haha | Cyanea grimesiana ssp. grimesiana | Endangered | Wherever found | 10-10-1996 |
| Haha | Cyanea grimesiana ssp. obatae | Endangered | Wherever found | 06-27-1994 |
| Haha | Cyanea hamatiflora ssp. carlsonii | Endangered | Wherever found | 03-04-1994 |
| Haha | Cyanea hamatiflora ssp. hamatiflora | Endangered | Wherever found | 09-03-1999 |
| Haha | Cyanea humboldtiana | Endangered | Wherever found | 10-10-1996 |
| Haha | Cyanea kolekoleensis | Endangered | Wherever found | 05-13-2010 |
| Haha | Cyanea koolauensis | Endangered | Wherever found | 10-10-1996 |
| Haha | Cyanea kuhihewa | Endangered | Wherever found | 05-13-2010 |
| Haha | Cyanea kunthiana | Endangered | Wherever found | 06-27-2013 |
| Haha | Cyanea lanceolata | Endangered | Wherever found | 10-18-2012 |
| Haha | Cyanea lobata | Endangered | Wherever found | 05-15-1992 |
| Haha | Cyanea longiflora | Endangered | Wherever found | 10-10-1996 |
| Haha | Cyanea mannii | Endangered | Wherever found | 10-08-1992 |
| Haha | Cyanea marksii | Endangered | Wherever found | 11-29-2013 |
| Haha | Cyanea mceldowneyi | Endangered | Wherever found | 05-15-1992 |
| Haha | Cyanea obtusa | Endangered | Wherever found | 06-27-2013 |
| Haha | Cyanea pinnatifida | Endangered | Wherever found | 10-29-1991 |
| Haha | Cyanea procera | Endangered | Wherever found | 10-08-1992 |
| Haha | Cyanea profuga | Endangered | Wherever found | 06-27-2013 |
| Haha | Cyanea purpurellifolia | Endangered | Wherever found | 10-18-2012 |
| Haha | Cyanea recta | Threatened | Wherever found | 10-10-1996 |
| Haha | Cyanea remyi | Endangered | Wherever found | 10-10-1996 |
| Haha | Cyanea rivularis | Endangered | Wherever found | 10-10-1996 |
| Haha | Cyanea shipmanii | Endangered | Wherever found | 03-04-1994 |
| Haha | Cyanea stictophylla | Endangered | Wherever found | 03-04-1994 |
| Haha | Cyanea st.-johnii | Endangered | Wherever found | 10-10-1996 |
| Haha | Cyanea superba | Endangered | Wherever found | 09-11-1991 |
| Haha | Cyanea truncata | Endangered | Wherever found | 03-28-1994 |
| Haha | Cyanea undulata | Endangered | Wherever found | 09-20-1991 |
| haha nui | Cyanea horrida | Endangered | Wherever found | 06-27-2013 |
| Hairy Orcutt grass | Orcuttia pilosa | Endangered | Wherever found | 03-26-1997 |
| Hairy rattleweed | Baptisia arachnifera | Endangered | Wherever found | 05-27-1978 |
| Haitian solenodon | Solenodon paradoxus | Endangered | Wherever found | 06-02-1970 |
| haiwale | Cyrtandra ferripilosa | Endangered | Wherever found | 06-27-2013 |
| haiwale | Cyrtandra nanawaleensis | Endangered | Wherever found | 11-29-2013 |
| haiwale | Cyrtandra wagneri | Endangered | Wherever found | 11-29-2013 |
| Haiwale | Cyrtandra gracilis | Endangered | Wherever found | 10-18-2012 |
| Haiwale | Cyrtandra paliku | Endangered | Wherever found | 05-13-2010 |
| Haiwale | Cyrtandra waiolani | Endangered | Wherever found | 10-18-2012 |
| Ha`iwale | Cyrtandra crenata | Endangered | Wherever found | 03-28-1994 |
| Ha`iwale | Cyrtandra dentata | Endangered | Wherever found | 10-10-1996 |
| Ha`iwale | Cyrtandra filipes | Endangered | Wherever found | 06-27-2013 |
| Ha`iwale | Cyrtandra giffardii | Endangered | Wherever found | 03-04-1994 |
| Ha`iwale | Cyrtandra hematos | Endangered | Wherever found | 10-31-2016 |
| Ha`iwale | Cyrtandra kaulantha | Endangered | Wherever found | 10-18-2012 |
| Ha`iwale | Cyrtandra limahuliensis | Threatened | Wherever found | 02-25-1994 |
| Ha`iwale | Cyrtandra munroi | Endangered | Wherever found | 05-15-1992 |
| Ha`iwale | Cyrtandra oenobarba | Endangered | Wherever found | 05-13-2010 |
| Ha`iwale | Cyrtandra oxybapha | Endangered | Wherever found | 06-27-2013 |
| Ha`iwale | Cyrtandra polyantha | Endangered | Wherever found | 03-28-1994 |
| Ha`iwale | Cyrtandra sessilis | Endangered | Wherever found | 10-18-2012 |
| Ha`iwale | Cyrtandra subumbellata | Endangered | Wherever found | 10-10-1996 |
| Ha`iwale | Cyrtandra tintinnabula | Endangered | Wherever found | 03-04-1994 |
| Ha`iwale | Cyrtandra viridiflora | Endangered | Wherever found | 10-10-1996 |
| Hala pepe | Pleomele fernaldii | Endangered | Wherever found | 06-27-2013 |
| Hala pepe | Pleomele forbesii | Endangered | Wherever found | 10-18-2012 |
| Hala pepe | Pleomele hawaiiensis | Endangered | Wherever found | 10-10-1996 |
| Harperella | Ptilimnium nodosum | Endangered | Wherever found | 10-28-1988 |
| Harper's beauty | Harperocallis flava | Endangered | | 11-01-1979 |
| Harpy eagle | Harpia harpyja | Endangered | Wherever found | 06-14-1976 |
| Hartmann's mountain zebra | Equus zebra hartmannae | Threatened | Wherever found | 09-20-1979 |
| Hartweg's golden sunburst | Pseudobahia bahiifolia | Endangered | Wherever found | 02-06-1997 |
| Hau kuahiwi | Hibiscadelphus giffardianus | Endangered | Wherever found | 10-10-1996 |
| Hau kuahiwi | Hibiscadelphus hualalaiensis | Endangered | Wherever found | 10-10-1996 |
| Hau kuahiwi | Hibiscadelphus woodii | Endangered | Wherever found | 10-10-1996 |
| Hawaii akepa | Loxops coccineus | Endangered | Wherever found | 10-13-1970 |
| Hawaiian (='alala) Crow | Corvus hawaiiensis | Endangered | Wherever found | 03-11-1967 |
| Hawaiian bluegrass | Poa sandvicensis | Endangered | Wherever found | 05-13-1992 |
| Hawaiian common gallinule | Gallinula galeata sandvicensis | Endangered | Wherever found | 03-11-1967 |
| Hawaiian coot | Fulica americana alai | Endangered | Wherever found | 10-13-1970 |
| Hawaiian gardenia (=Na`u) | Gardenia brighamii | Endangered | Wherever found | 08-21-1985 |
| Hawaiian goose | Branta (=Nesochen) sandvicensis | Threatened | Wherever found | 03-11-1967 |
| Hawaiian hoary bat | Lasiurus cinereus semotus | Endangered | Wherever found | 10-13-1970 |
| Hawaiian (=koloa) Duck | Anas wyvilliana | Endangered | Wherever found | 03-11-1967 |
| Hawaiian monk seal | Monachus schauinslandi | Endangered | Wherever found | 12-23-1976 |
| Hawaiian petrel | Pterodroma sandwichensis | Endangered | Wherever found | 03-11-1967 |
| Hawaiian picture-wing fly | Drosophila aglaia | Endangered | Wherever found | 05-09-2006 |
| Hawaiian picture-wing fly | Drosophila differens | Endangered | Wherever found | 05-09-2006 |
| Hawaiian picture-wing fly | Drosophila digressa | Endangered | Wherever found | 11-29-2013 |
| Hawaiian picture-wing fly | Drosophila hemipeza | Endangered | Wherever found | 05-09-2006 |
| Hawaiian picture-wing fly | Drosophila heteroneura | Endangered | Wherever found | 05-09-2006 |
| Hawaiian picture-wing fly | Drosophila montgomeryi | Endangered | Wherever found | 05-09-2006 |
| Hawaiian picture-wing fly | Drosophila mulli | Threatened | Wherever found | 05-09-2006 |
| Hawaiian picture-wing fly | Drosophila musaphilia | Endangered | Wherever found | 05-09-2006 |
| Hawaiian picture-wing fly | Drosophila neoclavisetae | Endangered | Wherever found | 05-09-2006 |
| Hawaiian picture-wing fly | Drosophila obatai | Endangered | Wherever found | 05-09-2006 |
| Hawaiian picture-wing fly | Drosophila ochrobasis | Endangered | Wherever found | 05-09-2006 |
| Hawaiian picture-wing fly | Drosophila sharpi | Endangered | Wherever found | 05-13-2010 |
| Hawaiian picture-wing fly | Drosophila substenoptera | Endangered | Wherever found | 05-09-2006 |
| Hawaiian picture-wing fly | Drosophila tarphytrichia | Endangered | Wherever found | 05-09-2006 |
| Hawaiian stilt | Himantopus mexicanus knudseni | Endangered | Wherever found | 10-13-1970 |
| Hawaiian vetch | Vicia menziesii | Endangered | Wherever found | 05-27-1978 |
| Hawaiian yellow-faced bee | Hylaeus kuakea | Endangered | Wherever found | 10-31-2016 |
| Hawaiian yellow-faced bee | Hylaeus longiceps | Endangered | Wherever found | 10-31-2016 |
| Hawaiian yellow-faced bee | Hylaeus mana | Endangered | Wherever found | 10-31-2016 |
| Hawaii creeper | Oreomystis mana | Endangered | Wherever found | 10-28-1975 |
| Hawksbill sea turtle | Eretmochelys imbricata | Endangered | Wherever found | 06-02-1970 |
| Hay's Spring amphipod | Stygobromus hayi | Endangered | Wherever found | 02-05-1982 |
| Hayun Iagu (=(Guam), Tronkon guafi (Rota)) | Serianthes nelsonii | Endangered | Wherever found | 02-18-1987 |
| Heau | Exocarpos luteolus | Endangered | Wherever found | 02-25-1994 |
| Heau | Exocarpos menziesii | Endangered | | 10-31-2016 |
| Heavy pigtoe | Pleurobema taitianum | Endangered | Wherever found | 04-07-1987 |
| Heinroth's shearwater | Puffinus heinrothi | Threatened | Wherever found | 01-05-2010 |
| Heliotrope milk-vetch | Astragalus montii | Threatened | Wherever found | 11-06-1987 |
| Hell Creek Cave crayfish | Cambarus zophonastes | Endangered | Wherever found | 04-07-1987 |
| Heller's blazingstar | Liatris helleri | Threatened | Wherever found | 11-19-1987 |
| Helmeted honeyeater | Lichenostomus melanops cassidix (=Meliphaga c.) | Endangered | Wherever found | 12-02-1970 |
| Helmeted hornbill | Buceros (=Rhinoplax) vigil | Endangered | Wherever found | 06-14-1976 |
| Helotes mold beetle | Batrisodes venyivi | Endangered | Wherever found | 12-26-2000 |
| Hermes copper butterfly | Lycaena hermes | Threatened | Wherever found | 01-20-2022 |
| Hickman's potentilla | Potentilla hickmanii | Endangered | Wherever found | 08-12-1998 |
| Hierro giant lizard | Gallotia simonyi simonyi | Endangered | Wherever found | 02-29-1984 |
| Higgins eye (pearlymussel) | Lampsilis higginsii | Endangered | Wherever found | 06-14-1976 |
| Highlands scrub hypericum | Hypericum cumulicola | Endangered | | 01-21-1987 |
| Higo Chumbo | Harrisia portoricensis | Threatened | Wherever found | 08-08-1990 |
| Higuero de sierra | Crescentia portoricensis | Endangered | Wherever found | 12-04-1987 |
| Hiko White River springfish | Crenichthys baileyi grandis | Endangered | Wherever found | 09-27-1985 |
| Hilaris yellow-faced bee | Hylaeus hilaris | Endangered | Wherever found | 10-31-2016 |
| Hillebrand's reedgrass | Calamagrostis hillebrandii | Endangered | Wherever found | 06-27-2013 |
| Hilo ischaemum | Ischaemum byrone | Endangered | Wherever found | 03-04-1994 |
| Hinckley oak | Quercus hinckleyi | Threatened | Wherever found | 08-26-1988 |
| Hine's emerald dragonfly | Somatochlora hineana | Endangered | Wherever found | 01-26-1995 |
| Hispid hare | Caprolagus hispidus | Endangered | Wherever found | 06-14-1976 |
| Hoawa | Pittosporum halophilum | Endangered | Wherever found | 06-27-2013 |
| Hoawa | Pittosporum hawaiiense | Endangered | Wherever found | 11-29-2013 |
| Ho`awa | Pittosporum napaliense | Endangered | Wherever found | 05-13-2010 |
| Hoffmann's rock-cress | Arabis hoffmannii | Endangered | Wherever found | 07-31-1997 |
| Hoffmann's slender-flowered gilia | Gilia tenuiflora ssp. hoffmannii | Endangered | Wherever found | 07-31-1997 |
| Hohiu | Dryopteris glabra var. pusilla | Endangered | Wherever found | 10-31-2016 |
| Holei | Ochrosia haleakalae | Endangered | Wherever found | 10-31-2016 |
| Holei | Ochrosia kilaueaensis | Endangered | Wherever found | 03-04-1994 |
| Holmgren milk-vetch | Astragalus holmgreniorum | Endangered | Wherever found | 09-28-2001 |
| Holy Ghost ipomopsis | Ipomopsis sancti-spiritus | Endangered | Wherever found | 03-23-1994 |
| Homerus swallowtail butterfly | Papilio homerus | Endangered | Wherever found | 01-14-1993 |
| Honduran emerald hummingbird | Amazilia luciae | Endangered | Wherever found | 08-28-2015 |
| Honohono | Haplostachys haplostachya | Endangered | Wherever found | 11-29-1979 |
| Hooded Crane | Grus monacha | Endangered | Wherever found | 12-02-1970 |
| Hook-billed hermit (hummingbird) | Ramphodon (=Glaucis) dohrnii | Endangered | Wherever found | 06-14-1976 |
| Hoover's spurge | Chamaesyce hooveri | Threatened | Wherever found | 03-26-1997 |
| Horned guan | Oreophasis derbianus | Endangered | Wherever found | 06-02-1970 |
| Houghton's goldenrod | Solidago houghtonii | Threatened | Wherever found | 07-18-1988 |
| Houston toad | Bufo houstonensis | Endangered | Wherever found | 10-13-1970 |
| Howell''s spectacular thelypody | Thelypodium howellii ssp. spectabilis | Threatened | Wherever found | 05-26-1999 |
| Howell's spineflower | Chorizanthe howellii | Endangered | Wherever found | 06-22-1992 |
| Huachuca water-umbel | Lilaeopsis schaffneriana var. recurva | Endangered | Wherever found | 01-06-1997 |
| Hulumoa | Korthalsella degeneri | Endangered | Wherever found | 10-18-2012 |
| Humboldt penguin | Spheniscus humboldti | Threatened | Wherever found | 09-02-2010 |
| Humpback chub | Gila cypha | Threatened | Wherever found | 03-11-1967 |
| Humpback whale | Megaptera novaeangliae | Endangered | Arabian Sea DPS | 06-02-1970 |
| Humpback whale | Megaptera novaeangliae | Threatened | Mexico DPS | 06-02-1970 |
| Humpback whale | Megaptera novaeangliae | Endangered | Cape Verde Island/Northwest Africa | 06-02-1970 |
| Humpback whale | Megaptera novaeangliae | Endangered | Central America DPS | 06-02-1970 |
| Humpback whale | Megaptera novaeangliae | Endangered | Western North Pacific | 06-02-1970 |
| Humped tree snail | Partula gibba | Endangered | Wherever found | 11-02-2015 |
| Hungerford's crawling water Beetle | Brychius hungerfordi | Endangered | Wherever found | 03-07-1994 |
| Hutton tui chub | Gila bicolor ssp. | Threatened | Wherever found | 03-28-1985 |
| Hyacinth macaw | Anodorhynchus hyacinthinus | Threatened | Wherever found | 09-12-2018 |
| Ibadan malimbe | Malimbus ibadanensis | Endangered | Wherever found | 01-12-1995 |
| Ibiza wall lizard | Podarcis pityusensis | Threatened | Wherever found | 02-29-1984 |
| Ihi | Portulaca villosa | Endangered | Wherever found | 10-31-2016 |
| Ihi`ihi | Marsilea villosa | Endangered | Wherever found | 06-22-1992 |
| `I`iwi | Drepanis coccinea | Threatened | Wherever found | 10-20-2017 |
| Ikan temoleh (minnow) | Probarbus jullieni | Endangered | Wherever found | 06-14-1976 |
| Illinois cave amphipod | Gammarus acherondytes | Endangered | Wherever found | 09-03-1998 |
| Imperial parrot | Amazona imperialis | Endangered | Wherever found | 06-02-1970 |
| Imperial pheasant | Lophura imperialis | Endangered | Wherever found | 06-02-1970 |
| Imperial woodpecker | Campephilus imperialis | Endangered | Wherever found | 06-02-1970 |
| Inagua Island turtle | Trachemys stejnegeri malonei | Endangered | Wherever found | 09-30-1991 |
| Independence Valley speckled dace | Rhinichthys osculus lethoporus | Endangered | Wherever found | 10-10-1989 |
| Indiana bat | Myotis sodalis | Endangered | Wherever found | 03-11-1967 |
| Indian (=Bengal) monitor | Varanus bengalensis | Endangered | Wherever found | 06-14-1976 |
| Indian Knob mountainbalm | Eriodictyon altissimum | Endangered | Wherever found | 12-15-1994 |
| Indian python | Python molurus molurus | Endangered | Wherever found | 06-14-1976 |
| Indian sawback turtle | Kachuga tecta tecta | Endangered | Wherever found | 06-14-1976 |
| Indian softshell turtle | Trionyx gangeticus | Endangered | Wherever found | 06-14-1976 |
| Indigo macaw | Anodorhynchus leari | Endangered | Wherever found | 06-14-1976 |
| Indochina hog deer | Axis porcinus annamiticus | Endangered | Wherever found | 06-14-1976 |
| Indri lemur | Indri indri | Endangered | Wherever found | 06-02-1970 |
| Inflated heelsplitter | Potamilus inflatus | Threatened | Wherever found | 09-28-1990 |
| Interrupted (=Georgia) Rocksnail | Leptoxis foremani | Endangered | Wherever found | 12-02-2010 |
| Inyo California towhee | Pipilo crissalis eremophilus | Threatened | Wherever found | 08-03-1987 |
| Ione (incl. Irish Hill) buckwheat | Eriogonum apricum (incl. var. prostratum) | Endangered | Wherever found | 05-26-1999 |
| Ione manzanita | Arctostaphylos myrtifolia | Threatened | Wherever found | 05-26-1999 |
| Iowa Pleistocene snail | Discus macclintocki | Endangered | Wherever found | 08-02-1978 |
| Iriomote cat | Prionailurus (=Felis) bengalensis iriomotensis | Endangered | Wherever found | 07-27-1979 |
| Island Barberry | Berberis pinnata ssp. insularis | Endangered | Wherever found | 07-31-1997 |
| Island bedstraw | Galium buxifolium | Endangered | Wherever found | 07-31-1997 |
| Island Grouper | Mycteroperca fusca | Threatened | | |
| Island malacothrix | Malacothrix squalida | Endangered | Wherever found | 07-31-1997 |
| Island marble Butterfly | Euchloe ausonides insulanus | Endangered | Wherever found | 06-04-2020 |
| Island phacelia | Phacelia insularis ssp. insularis | Endangered | Wherever found | 07-31-1997 |
| Island rush-rose | Helianthemum greenei | Threatened | Wherever found | 07-31-1997 |
| Israel painted frog | Discoglossus nigriventer | Endangered | Wherever found | 06-02-1970 |
| Ivory-billed woodpecker | Campephilus principalis | Endangered | Wherever found | 03-11-1967 |
| Ivory Ornamental Tarantula | Poecilotheria subfusca | Endangered | Wherever found | 08-30-2018 |
| Jaguar | Panthera onca | Endangered | Wherever found | 03-28-1972 |
| Jamaican boa | Epicrates subflavus | Endangered | Wherever found | 06-02-1970 |
| Jamaican iguana | Cyclura collei | Endangered | Wherever found | 06-22-1983 |
| James spinymussel | Parvaspina collina | Endangered | Wherever found | 07-22-1988 |
| Japanese Crane | Grus japonensis | Endangered | Wherever found | 06-02-1970 |
| Japanese crested ibis | Nipponia nippon | Endangered | Wherever found | 06-02-1970 |
| Japanese giant salamander | Andrias japonicus (=davidianus j.) | Endangered | Wherever found | 06-14-1976 |
| Japanese macaque | Macaca fuscata | Threatened | Wherever found | 10-19-1976 |
| Javan rhinoceros | Rhinoceros sondaicus | Endangered | Sikkim, Thailand, Malaysia, Indonesia, Indochina, Burma, Bangladesh | 06-02-1970 |
| Jemez Mountains salamander | Plethodon neomexicanus | Endangered | Wherever found | 10-10-2013 |
| Jentink's duiker | Cephalophus jentinki | Endangered | Wherever found | 07-27-1979 |
| Jerdon's courser | Rhinoptilus bitorquatus | Endangered | Wherever found | 09-12-2011 |
| Jesup''s milk-vetch | Astragalus robbinsii var. jesupii | Endangered | Wherever found | 06-05-1987 |
| Jollyville Plateau Salamander | Eurycea tonkawae | Threatened | Wherever found | 09-19-2013 |
| Jones Cycladenia | Cycladenia humilis var. jonesii | Threatened | Wherever found | 05-05-1986 |
| June sucker | Chasmistes liorus | Threatened | Wherever found | 03-31-1986 |
| Junin grebe | Podiceps taczanowskii | Endangered | Wherever found | 07-24-2012 |
| Junin rail | Laterallus tuerosi | Endangered | Wherever found | 07-24-2012 |
| Kaempfer's tody-tyrant | Hemitriccus kaempferi | Endangered | Wherever found | 01-27-2011 |
| Kagu | Rhynochetos jubatus | Endangered | Wherever found | 06-02-1970 |
| Kakapo | Strigops habroptilus | Endangered | Wherever found | 06-02-1970 |
| Kaluga sturgeon | Huso dauricus | Endangered | Wherever found | 09-04-2014 |
| Kamakahala | Labordia cyrtandrae | Endangered | Wherever found | 10-10-1996 |
| Kamakahala | Labordia helleri | Endangered | Wherever found | 05-13-2010 |
| Kamakahala | Labordia lydgatei | Endangered | Wherever found | 09-20-1991 |
| Kamakahala | Labordia pumila | Endangered | Wherever found | 05-13-2010 |
| Kamakahala | Labordia tinifolia var. lanaiensis | Endangered | Wherever found | 09-03-1999 |
| Kamakahala | Labordia tinifolia var. wahiawaensis | Endangered | Wherever found | 10-10-1996 |
| Kamakahala | Labordia triflora | Endangered | Wherever found | 09-03-1999 |
| Kamanomano | Cenchrus agrimonioides | Endangered | Wherever found | 10-10-1996 |
| Kamapua`a | Kadua fluviatilis | Endangered | Wherever found | 10-31-2016 |
| Kandy Parachute Spider | Poecilotheria smithi | Endangered | Wherever found | 08-30-2018 |
| Karner blue butterfly | Lycaeides melissa samuelis | Endangered | Wherever found | 12-14-1992 |
| Kashmir stag | Cervus elaphus hanglu | Endangered | Wherever found | 06-02-1970 |
| Kauai akialoa (honeycreeper) | Akialoa stejnegeri | Endangered | Wherever found | 03-11-1967 |
| Kauai cave amphipod | Spelaeorchestia koloana | Endangered | Wherever found | 01-14-2000 |
| Kauai cave wolf or pe'e pe'e maka 'ole spider | Adelocosa anops | Endangered | Wherever found | 01-14-2000 |
| Kauai hau kuahiwi | Hibiscadelphus distans | Endangered | Wherever found | 04-29-1986 |
| Kauai nukupuu | Hemignathus hanapepe | Endangered | Wherever found | 03-11-1967 |
| Kauai `o`o (honeyeater) | Moho braccatus | Endangered | Wherever found | 03-11-1967 |
| Kauila | Colubrina oppositifolia | Endangered | Wherever found | 03-04-1994 |
| Kaulu | Pteralyxia kauaiensis | Endangered | Wherever found | 02-25-1994 |
| Kaulu | Pteralyxia macrocarpa | Endangered | Wherever found | 10-18-2012 |
| Kearney's blue-star | Amsonia kearneyana | Endangered | Wherever found | 01-19-1989 |
| Keck's Checker-mallow | Sidalcea keckii | Endangered | Wherever found | 02-16-2000 |
| Kemp's ridley sea turtle | Lepidochelys kempii | Endangered | Wherever found | 12-02-1970 |
| Kendall Warm Springs dace | Rhinichthys osculus thermalis | Endangered | Wherever found | 10-13-1970 |
| Kentucky arrow darter | Etheostoma spilotum | Threatened | Wherever found | 11-04-2016 |
| Kentucky cave shrimp | Palaemonias ganteri | Endangered | Wherever found | 10-12-1983 |
| Kentucky glade cress | Leavenworthia exigua laciniata | Threatened | Wherever found | 06-05-2014 |
| Kenwood Marsh checker-mallow | Sidalcea oregana ssp. valida | Endangered | Wherever found | 10-22-1997 |
| Kern mallow | Eremalche kernensis | Endangered | Wherever found | 07-19-1990 |
| Kern primrose sphinx moth | Euproserpinus euterpe | Threatened | Wherever found | 04-08-1980 |
| Key deer | Odocoileus virginianus clavium | Endangered | Wherever found | 03-11-1967 |
| Key Largo cotton mouse | Peromyscus gossypinus allapaticola | Endangered | Wherever found | 09-21-1983 |
| Key Largo woodrat | Neotoma floridana smalli | Endangered | Wherever found | 09-21-1983 |
| Key tree cactus | Pilosocereus robinii | Endangered | | 07-19-1984 |
| Killer whale | Orcinus orca | Endangered | Southern Resident DPS See 50 CFR 224.101 | 02-16-2006 |
| Kincaid's Lupine | Lupinus sulphureus ssp. kincaidii | Threatened | Wherever found | 01-25-2000 |
| Kio`ele | Kadua coriacea | Endangered | Wherever found | 05-15-1992 |
| Kiponapona | Phyllostegia racemosa | Endangered | Wherever found | 10-10-1996 |
| Kneeland Prairie penny-cress | Thlaspi californicum | Endangered | Wherever found | 02-09-2000 |
| Knieskern's Beaked-rush | Rhynchospora knieskernii | Threatened | Wherever found | 07-18-1991 |
| Knowlton's cactus | Pediocactus knowltonii | Endangered | Wherever found | 11-28-1979 |
| Koala | Phascolarctos cinereus | Threatened | Australia | 05-09-2000 |
| Koch's pitta | Pitta kochi | Endangered | Wherever found | 06-14-1976 |
| Kodachrome bladderpod | Lesquerella tumulosa | Endangered | Wherever found | 10-06-1993 |
| Kohe malama malama o kanaloa | Kanaloa kahoolawensis | Endangered | Wherever found | 09-03-1999 |
| Koholapehu | Dubautia latifolia | Endangered | Wherever found | 05-13-1992 |
| Kokako (wattlebird) | Callaeas cinerea | Endangered | Wherever found | 06-02-1970 |
| Koki`o | Kokia drynarioides | Endangered | Wherever found | 12-04-1984 |
| Koki`o | Kokia kauaiensis | Endangered | Wherever found | 10-10-1996 |
| Koki`o ke`oke`o | Hibiscus arnottianus ssp. immaculatus | Endangered | Wherever found | 10-08-1992 |
| Koki`o ke`oke`o | Hibiscus waimeae ssp. hannerae | Endangered | Wherever found | 10-10-1996 |
| Kolea | Myrsine fosbergii | Endangered | Wherever found | 10-31-2016 |
| Kolea | Myrsine juddii | Endangered | Wherever found | 10-10-1996 |
| Kolea | Myrsine knudsenii | Endangered | Wherever found | 05-13-2010 |
| Kolea | Myrsine linearifolia | Threatened | Wherever found | 10-10-1996 |
| Kolea | Myrsine mezii | Endangered | Wherever found | 05-13-2010 |
| Kolea | Myrsine vaccinioides | Endangered | Wherever found | 06-27-2013 |
| Komodo Island monitor | Varanus komodoensis | Endangered | Wherever found | 06-14-1976 |
| kookoolau | Bidens hillebrandiana ssp. hillebrandiana | Endangered | Wherever found | 11-29-2013 |
| Ko`oko`olau | Bidens amplectens | Endangered | Wherever found | 10-18-2012 |
| Ko`oko`olau | Bidens campylotheca ssp. pentamera | Endangered | Wherever found | 06-27-2013 |
| Ko`oko`olau | Bidens campylotheca ssp. waihoiensis | Endangered | Wherever found | 06-27-2013 |
| Ko`oko`olau | Bidens conjuncta | Endangered | Wherever found | 06-27-2013 |
| Ko`oko`olau | Bidens micrantha ssp. ctenophylla | Endangered | Wherever found | 11-29-2013 |
| Ko`oko`olau | Bidens micrantha ssp. kalealaha | Endangered | Wherever found | 05-15-1992 |
| Ko`oko`olau | Bidens wiebkei | Endangered | Wherever found | 10-08-1992 |
| Ko`oloa`ula | Abutilon menziesii | Endangered | Wherever found | 09-26-1986 |
| kopa | Kadua cordata remyi | Endangered | Wherever found | 09-03-1999 |
| Kopiko | Psychotria grandiflora | Endangered | Wherever found | 05-13-2010 |
| Kopiko | Psychotria hexandra ssp. oahuensis | Endangered | Wherever found | 10-18-2012 |
| Kopiko | Psychotria hobdyi | Endangered | Wherever found | 05-13-2010 |
| Koster's springsnail | Juturnia kosteri | Endangered | Wherever found | 08-09-2005 |
| Kouprey | Bos sauveli | Endangered | Wherever found | 06-02-1970 |
| Kral's water-plantain | Sagittaria secundifolia | Threatened | Wherever found | 04-13-1990 |
| Kretschmarr Cave mold beetle | Texamaurops reddelli | Endangered | Wherever found | 09-16-1988 |
| Kuahiwi laukahi | Plantago hawaiensis | Endangered | Wherever found | 03-04-1994 |
| Kuahiwi laukahi | Plantago princeps | Endangered | Wherever found | 11-10-1994 |
| Kuawawaenohu | Schiedea lychnoides | Endangered | Wherever found | 10-10-1996 |
| Kuenzler hedgehog cactus | Echinocereus fendleri var. kuenzleri | Threatened | Wherever found | 11-28-1979 |
| Kuhl's (=Bawean) deer | Axis porcinus kuhli | Endangered | Wherever found | 06-02-1970 |
| Kulu`i | Nototrichium humile | Endangered | Wherever found | 10-29-1991 |
| Kupukupu makalii | Cyclosorus boydiae | Endangered | Wherever found | 10-31-2016 |
| Lacy elimia (snail) | Elimia crenatella | Threatened | Wherever found | 10-28-1998 |
| La Graciosa thistle | Cirsium loncholepis | Endangered | Wherever found | 03-20-2000 |
| Laguna Beach liveforever | Dudleya stolonifera | Threatened | Wherever found | 10-13-1998 |
| Laguna Mountains skipper | Pyrgus ruralis lagunae | Endangered | Wherever found | 01-16-1997 |
| Lahontan cutthroat trout | Oncorhynchus clarkii henshawi | Threatened | Wherever found | 10-13-1970 |
| Lake County stonecrop | Parvisedum leiocarpum | Endangered | Wherever found | 06-18-1997 |
| Lakela's mint | Dicerandra immaculata | Endangered | | 05-15-1985 |
| Lakeside daisy | Hymenoxys herbacea | Threatened | Wherever found | 06-23-1988 |
| Lanai sandalwood (=`iliahi) | Santalum haleakalae var. lanaiense | Endangered | Wherever found | 01-24-1986 |
| Lanai tree snail | Partulina semicarinata | Endangered | Wherever found | 06-27-2013 |
| Lanai tree snail | Partulina variabilis | Endangered | Wherever found | 06-27-2013 |
| Lane Mountain milk-vetch | Astragalus jaegerianus | Endangered | Wherever found | 10-06-1998 |
| Lange's metalmark butterfly | Apodemia mormo langei | Endangered | Wherever found | 06-08-1976 |
| Langford's tree snail | Partula langfordi | Endangered | Wherever found | 11-02-2015 |
| Large desert marsupial-mouse | Sminthopsis psammophila | Endangered | Wherever found | 12-02-1970 |
| Large-eared hutia | Capromys auritus | Endangered | Wherever found | 05-16-1986 |
| Large-flowered fiddleneck | Amsinckia grandiflora | Endangered | Wherever found | 05-08-1985 |
| Large-flowered skullcap | Scutellaria montana | Threatened | Wherever found | 06-20-1986 |
| Large-flowered woolly meadowfoam | Limnanthes pumila ssp. grandiflora | Endangered | Wherever found | 11-07-2002 |
| Large-fruited sand-verbena | Abronia macrocarpa | Endangered | Wherever found | 09-28-1988 |
| Large Kauai (=kamao) Thrush | Myadestes myadestinus | Endangered | Wherever found | 10-13-1970 |
| Largetooth Sawfish | Pristis pristis | Endangered | Wherever found | 07-23-2014 |
| Lar Valley viper | Vipera latifii | Endangered | Wherever found | 06-22-1983 |
| Last Chance townsendia | Townsendia aprica | Threatened | Wherever found | 08-21-1985 |
| Lau `ehu | Panicum niihauense | Endangered | Wherever found | 10-10-1996 |
| Laulihilihi | Schiedea stellarioides | Endangered | Wherever found | 10-10-1996 |
| Laurel dace | Chrosomus saylori | Endangered | Wherever found | 09-08-2011 |
| Layne's butterweed | Senecio layneae | Threatened | Wherever found | 10-18-1996 |
| Laysan duck | Anas laysanensis | Endangered | Wherever found | 03-11-1967 |
| Laysan finch (honeycreeper) | Telespyza cantans | Endangered | Wherever found | 03-11-1967 |
| Leadbeater's Possum | Gymnobelideus leadbeateri | Endangered | Wherever found | 05-16-1986 |
| Leafy prairie-clover | Dalea foliosa | Endangered | | 05-01-1991 |
| Least Bell's vireo | Vireo bellii pusillus | Endangered | Wherever found | 05-02-1986 |
| Leatherback sea turtle | Dermochelys coriacea | Endangered | Wherever found | 06-02-1970 |
| Lee County cave isopod | Lirceus usdagalun | Endangered | Wherever found | 11-20-1992 |
| Leedy's roseroot | Rhodiola integrifolia ssp. leedyi | Threatened | Wherever found | 04-22-1992 |
| Lee pincushion cactus | Coryphantha sneedii var. leei | Threatened | Wherever found | 11-26-1979 |
| lehua makanoe | Lysimachia daphnoides | Endangered | Wherever found | 05-13-2010 |
| Lemurs | Lemuridae (incl. genera Lemur, Phaner, Hapalemur, Lepilemur, Microcebus, Allocebus, Cheirogaleus, Varecia) | Endangered | Wherever found | 06-02-1970 |
| Leon Springs pupfish | Cyprinodon bovinus | Endangered | Wherever found | 08-15-1980 |
| Leopard | Panthera pardus | Threatened | In Africa, in the wild, south of, and including, the following countries: Gabon, Congo, Zaire, Uganda, Kenya | 01-28-1982 |
| Leopard | Panthera pardus | Endangered | Wherever found, except where it is listed as Threatened | 06-02-1970 |
| Leopard cat | Prionailurus (=Felis) bengalensis bengalensis | Endangered | Wherever found | 06-14-1976 |
| Leopard darter | Percina pantherina | Threatened | Wherever found | 02-27-1978 |
| Lesser prairie-chicken | Tympanuchus pallidicinctus | Endangered | Southern DPS: All lesser prairie-chickens south of a line starting at 37.9868 N, 105.0133 W, and ending at 31.7351 N, 98.3773 W, NAD83 | 03-27-2023 |
| Lesser prairie-chicken | Tympanuchus pallidicinctus | Threatened | Northern DPS: All lesser prairie-chickens north of a line starting at 37.9868 N, 105.0133 W, and ending at 31.7351 N, 98.3773 W, NAD83 | 03-27-2023 |
| Lesser rabbit bandicoot | Macrotis leucura | Endangered | Wherever found | 12-02-1970 |
| Lesser rhea (incl. Darwin's) | Rhea (=Pterocnemia) pennata | Endangered | Wherever found | 06-02-1970 |
| Lesser slow loris | Nycticebus pygmaeus | Threatened | Wherever found | 10-19-1976 |
| Lesueur's rat-kangaroo | Bettongia lesueur | Endangered | Wherever found | 12-02-1970 |
| Lewton's polygala | Polygala lewtonii | Endangered | | 04-27-1993 |
| L'hoest's monkey | Cercopithecus lhoesti | Endangered | Wherever found | 10-19-1976 |
| Light-footed clapper rail | Rallus longirostris levipes | Endangered | Wherever found | 10-13-1970 |
| Liliwai | Acaena exigua | Endangered | Wherever found | 05-15-1992 |
| Lion | Panthera leo ssp. leo | Endangered | Wherever found | 01-22-2016 |
| Lion | Panthera leo ssp. melanochaita | Threatened | Wherever found | 01-22-2016 |
| Lion-tailed macaque | Macaca silenus | Endangered | Wherever found | 06-02-1970 |
| Little Aguja (=Creek) Pondweed | Potamogeton clystocarpus | Endangered | Wherever found | 11-14-1991 |
| Little amphianthus | Amphianthus pusillus | Threatened | Wherever found | 02-05-1988 |
| Little blue macaw | Cyanopsitta spixii | Endangered | Wherever found | 06-14-1976 |
| Little Colorado spinedace | Lepidomeda vittata | Threatened | Wherever found | 03-11-1967 |
| Little earth hutia | Capromys sanfelipensis | Endangered | Wherever found | 05-16-1986 |
| Little Kern golden trout | Oncorhynchus aguabonita whitei | Threatened | Wherever found | 05-15-1978 |
| Little Mariana fruit Bat | Pteropus tokudae | Endangered | Wherever found | 08-27-1984 |
| Little planigale | Planigale ingrami subtilissima | Endangered | Wherever found | 12-02-1970 |
| Littlewing pearlymussel | Pegias fabula | Endangered | Wherever found | 11-14-1988 |
| Llanero Coqui | Eleutherodactylus juanariveroi | Endangered | Wherever found | 10-04-2012 |
| Lloyd''s Mariposa cactus | Sclerocactus mariposensis | Threatened | Wherever found | 12-06-1979 |
| Loach minnow | Tiaroga cobitis | Endangered | Wherever found | 10-28-1986 |
| Lobed Star Coral | Orbicella annularis | Threatened | Wherever found | 11-13-2014 |
| Loch Lomond coyote thistle | Eryngium constancei | Endangered | Wherever found | 08-01-1985 |
| Loggerhead sea turtle | Caretta caretta | Endangered | Northeast Atlantic Ocean DPS - Loggerhead sea turtles originating from the Northeast Atlantic Ocean north of the equator, south of 60 degrees N. Lat., and east of 40 degrees W. Long., except in the vicinity of the Strait of Gibraltar where the eastern boundary is 5 degrees 36 minutes W. Long | 07-23-1978 |
| Loggerhead sea turtle | Caretta caretta | Threatened | Loggerhead sea turtles originating from the South Atlantic Ocean south of the equator, north of 60 degrees S. Lat., west of 20 degrees E. Long., and east of 67 degrees W. Long | 07-23-1978 |
| Loggerhead sea turtle | Caretta caretta | Threatened | Northwest Atlantic Ocean DPS - Loggerhead sea turtles originating from the Northwest Atlantic Ocean west of 40 degrees W. Long | 07-23-1978 |
| Loggerhead sea turtle | Caretta caretta | Threatened | Loggerhead sea turtles originating from the Southeast Indian Ocean south of the equator, north of 60 degrees S. Lat., and east of 80 degrees E. Long.; South Pacific Ocean south of the equator, north of 60degrees S. Lat., and west of 141 degrees E. Long | 07-23-1978 |
| Loggerhead sea turtle | Caretta caretta | Threatened | Loggerhead sea turtles originating from the Southwest Indian Ocean north of the equator, south of 30 degrees N. Lat., east of 20 degrees E. Long., and west of 80 degrees E. Long. | 07-23-1978 |
| Loggerhead sea turtle | Caretta caretta | Endangered | North Indian Ocean DPS - Loggerhead sea turtles originating from the North Indian Ocean north of the equator and south of 30? N. Lat | 07-23-1978 |
| Loggerhead sea turtle | Caretta caretta | Endangered | Loggerhead sea turtles originating from the South Pacific south of the equator, north of 60 degrees S. Lat., west of 67 degrees W. Long., and east of 141 degrees E. Long. | 07-23-1978 |
| Loggerhead sea turtle | Caretta caretta | Endangered | North Pacific Ocean DPS - Loggerhead sea turtles originating from the North Pacific north of the equator and south of 60 degrees N. Lat | 07-23-1978 |
| Loggerhead sea turtle | Caretta caretta | Endangered | Mediterranean Sea DPS - Loggerhead sea turtles originating from the Mediterranean Sea east of 5 degrees 36 minues W. Long. | 07-23-1978 |
| Lompoc yerba santa | Eriodictyon capitatum | Endangered | Wherever found | 03-20-2000 |
| Longhorn fairy shrimp | Branchinecta longiantenna | Endangered | Wherever found | 09-19-1994 |
| Long-legged warbler | Trichocichla rufa | Endangered | Wherever found | 01-16-2008 |
| Longsolid | Fusconaia subrotunda | Threatened | Wherever found | 04-10-2023 |
| Longspurred mint | Dicerandra cornutissima | Endangered | | 11-01-1985 |
| Long-tailed ground roller | Uratelornis chimaera | Endangered | Wherever found | 06-02-1970 |
| Long-tailed langur | Presbytis potenziani | Threatened | Indonesia | 10-19-1976 |
| Long-tailed marsupial-mouse | Sminthopsis longicaudata | Endangered | Wherever found | 12-02-1970 |
| Long-tailed otter | Lontra (=Lutra) longicaudis (incl. platensis) | Endangered | Wherever found | 06-02-1970 |
| Lord Howe wood rail | Gallirallus (=Tricholimnas) sylvestris | Endangered | Wherever found | 06-14-1976 |
| Lost River sucker | Deltistes luxatus | Endangered | Wherever found | 07-18-1988 |
| Lotis blue butterfly | Lycaeides argyrognomon lotis | Endangered | Wherever found | 06-08-1976 |
| Louisiana pearlshell | Margaritifera hembeli | Threatened | Wherever found | 02-05-1988 |
| Louisiana pinesnake | Pituophis ruthveni | Threatened | Wherever found | 05-07-2018 |
| Louisiana quillwort | Isoetes louisianensis | Endangered | Wherever found | 10-28-1992 |
| loulu | Pritchardia aylmer-robinsonii | Endangered | Wherever found | 08-07-1996 |
| loulu | Pritchardia bakeri | Endangered | Wherever found | 10-31-2016 |
| loulu | Pritchardia hardyi | Endangered | Wherever found | 05-13-2010 |
| loulu | Pritchardia kaalae | Endangered | Wherever found | 10-10-1996 |
| loulu | Pritchardia lanigera | Endangered | Wherever found | 11-29-2013 |
| loulu | Pritchardia maideniana | Endangered | Wherever found | 03-04-1994 |
| loulu | Pritchardia munroi | Endangered | Wherever found | 10-08-1992 |
| loulu | Pritchardia napaliensis | Endangered | Wherever found | 10-10-1996 |
| loulu | Pritchardia remota | Endangered | Wherever found | 08-21-1996 |
| loulu | Pritchardia schattaueri | Endangered | Wherever found | 10-10-1996 |
| loulu | Pritchardia viscosa | Endangered | Wherever found | 10-10-1996 |
| Lower Keys marsh rabbit | Sylvilagus palustris hefneri | Endangered | Wherever found | 06-21-1990 |
| Lowland anoa | Bubalus depressicornis | Endangered | Wherever found | 06-02-1970 |
| Luzon peacock swallowtail butterfly | Papilio chikae | Endangered | Wherever found | 01-14-1993 |
| Lyon's pentachaeta | Pentachaeta lyonii | Endangered | Wherever found | 01-29-1997 |
| Lyrate bladderpod | Lesquerella lyrata | Threatened | Wherever found | 09-28-1990 |
| MacFarlane's four-o'clock | Mirabilis macfarlanei | Threatened | Wherever found | 11-29-1979 |
| Madagascar pochard | Aythya innotata | Endangered | Wherever found | 01-12-1995 |
| Madagascar radiated tortoise | Geochelone radiata | Endangered | Wherever found | 06-02-1970 |
| Madagascar red owl | Tyto soumagnei | Endangered | Wherever found | 09-28-1990 |
| Madagascar sea eagle | Haliaeetus vociferoides | Endangered | Wherever found | 01-12-1995 |
| Madagascar serpent eagle | Eutriorchis astur | Endangered | Wherever found | 01-12-1995 |
| Madison Cave isopod | Antrolana lira | Threatened | Wherever found | 10-04-1982 |
| Madla Cave Meshweaver | Cicurina madla | Endangered | Wherever found | 12-26-2000 |
| Magenta petrel | Pterodroma magentae | Endangered | Wherever found | 09-14-2009 |
| Maguire primrose | Primula maguirei | Threatened | Wherever found | 08-21-1985 |
| Mahoe | Alectryon macrococcus | Endangered | Wherever found | 05-15-1992 |
| Makou | Peucedanum sandwicense | Threatened | Wherever found | 02-25-1994 |
| Makou | Ranunculus hawaiensis | Endangered | Wherever found | 10-31-2016 |
| Makou | Ranunculus mauiensis | Endangered | Wherever found | 10-31-2016 |
| Malabar large-spotted civet | Viverra civettina (=megaspila c.) | Endangered | Wherever found | 07-27-1979 |
| Maleo megapode | Macrocephalon maleo | Endangered | Wherever found | 06-02-1970 |
| Malheur wire-lettuce | Stephanomeria malheurensis | Endangered | Wherever found | 11-10-1982 |
| Mancos milk-vetch | Astragalus humillimus | Endangered | Wherever found | 06-27-1985 |
| Mandrill | Mandrillus (=Papio) sphinx | Endangered | Wherever found | 10-19-1976 |
| Maned wolf | Chrysocyon brachyurus | Endangered | Wherever found | 12-02-1970 |
| Mann's bluegrass | Poa mannii | Endangered | Wherever found | 11-10-1994 |
| Mantled howler monkey | Alouatta palliata | Endangered | Wherever found | 06-14-1976 |
| Manus Island tree snail | Papustyla pulcherrima | Endangered | Wherever found | 06-02-1970 |
| Many-flowered navarretia | Navarretia leucocephala ssp. plieantha | Endangered | Wherever found | 06-18-1997 |
| Ma`oli`oli | Schiedea apokremnos | Endangered | Wherever found | 09-30-1991 |
| Ma`oli`oli | Schiedea hawaiiensis | Endangered | Wherever found | 11-29-2013 |
| Ma`oli`oli | Schiedea kealiae | Endangered | Wherever found | 10-10-1996 |
| Ma`oli`oli | Schiedea pubescens | Endangered | Wherever found | 10-31-2016 |
| Mao (= maomao) (honeyeater) | Gymnomyza samoensis | Endangered | Wherever found | 10-24-2016 |
| Mapele | Cyrtandra cyaneoides | Endangered | Wherever found | 10-10-1996 |
| Marbled cat | Pardofelis (=Felis) marmorata | Endangered | Wherever found | 06-14-1976 |
| Marbled murrelet | Brachyramphus marmoratus | Threatened | U.S.A. (CA, OR, WA) | 10-01-1992 |
| Marcescent dudleya | Dudleya cymosa ssp. marcescens | Threatened | Wherever found | 01-29-1997 |
| Margaretta's hermit | Phaethornis malaris margarettae | Endangered | Wherever found | 01-27-2011 |
| Margay | Leopardus (=Felis) wiedii | Endangered | Wherever found | 03-30-1972 |
| Maria Island ground lizard | Cnemidophorus vanzoi | Endangered | Wherever found | 09-30-1991 |
| Maria Island snake | Liophus ornatus | Endangered | Wherever found | 09-30-1991 |
| Mariana (=aga) Crow | Corvus kubaryi | Endangered | Wherever found | 08-27-1984 |
| Mariana common moorhen | Gallinula chloropus guami | Endangered | Wherever found | 08-27-1984 |
| Mariana eight-spot butterfly | Hypolimnas octocula marianensis | Endangered | Wherever found | 11-02-2015 |
| Mariana fruit Bat (=Mariana flying fox) | Pteropus mariannus mariannus | Threatened | Wherever found | 08-27-1984 |
| Mariana gray swiftlet | Aerodramus vanikorensis bartschi | Endangered | Wherever found | 08-27-1984 |
| Mariana wandering butterfly | Vagrans egistina | Endangered | Wherever found | 11-02-2015 |
| Marin dwarf-flax | Hesperolinon congestum | Threatened | Wherever found | 02-03-1995 |
| Marine otter | Lontra (=Lutra) felina | Endangered | Wherever found | 06-14-1976 |
| Mariposa pussypaws | Calyptridium pulchellum | Threatened | Wherever found | 10-14-1998 |
| Marquesas pigeon | Ducula galeata | Endangered | Wherever found | 09-12-2011 |
| Marron bacora | Solanum conocarpum | Endangered | | 07-18-2022 |
| Marsh deer | Blastocerus dichotomus | Endangered | Wherever found | 06-02-1970 |
| Marsh Sandwort | Arenaria paludicola | Endangered | Wherever found | 08-03-1993 |
| Martinique trembler (thrasher) | Cinclocerthia ruficauda gutturalis | Endangered | Wherever found | 06-02-1970 |
| Marungu sunbird | Nectarinia prigoginei | Endangered | Wherever found | 01-12-1995 |
| Maryland darter | Etheostoma sellare | Endangered | Wherever found | 03-11-1967 |
| Mascarene black petrel | Pterodroma aterrima | Endangered | Wherever found | 01-12-1995 |
| Masked bobwhite (quail) | Colinus virginianus ridgwayi | Endangered | Wherever found | 03-11-1967 |
| Mat-forming quillwort | Isoetes tegetiformans | Endangered | Wherever found | 02-05-1988 |
| Maui akepa | Loxops ochraceus | Endangered | Wherever found | 10-13-1970 |
| Maui dolphin | Cephalorhynchus hectori maui | Endangered | | 10-19-2017 |
| Maui nukupuu | Hemignathus affinis | Endangered | Wherever found | 10-13-1970 |
| Maui parrotbill (Kiwikiu) | Pseudonestor xanthophrys | Endangered | Wherever found | 03-11-1967 |
| Maui reedgrass | Calamagrostis expansa | Endangered | Wherever found | 10-31-2016 |
| Maui remya | Remya mauiensis | Endangered | Wherever found | 01-14-1991 |
| Mauna Loa (=Ka'u) silversword | Argyroxiphium kauense | Endangered | Wherever found | 04-07-1993 |
| Mauritius cuckoo-shrike | Coquus typicus | Endangered | Wherever found | 06-02-1970 |
| Mauritius fody | Foudia rubra | Endangered | Wherever found | 01-12-1995 |
| Mauritius kestrel | Falco punctatus | Endangered | Wherever found | 06-02-1970 |
| Mauritius olivaceous Bulbul | Hypsipetes borbonicus olivaceus | Endangered | Wherever found | 06-02-1970 |
| Mauritius parakeet | Psittacula echo | Endangered | Wherever found | 06-02-1970 |
| Mayaguana iguana | Cyclura carinata bartschi | Threatened | Wherever found | 06-22-1983 |
| McDonald's rock-cress | Arabis macdonaldiana | Endangered | Wherever found | 09-29-1978 |
| McNeill's deer | Cervus elaphus macneilii | Endangered | Wherever found | 06-02-1970 |
| Mead's milkweed | Asclepias meadii | Threatened | Wherever found | 09-01-1988 |
| Mediterranean monk seal | Monachus monachus | Endangered | Wherever found | 06-02-1970 |
| Mehamehame | Flueggea neowawraea | Endangered | Wherever found | 11-10-1994 |
| Meltwater lednian stonefly | Lednia tumana | Threatened | Wherever found | 12-23-2019 |
| Menzies' wallflower | Erysimum menziesii | Endangered | Wherever found | 06-22-1992 |
| Merriam's Montezuma quail | Cyrtonyx montezumae merriami | Endangered | Wherever found | 06-14-1976 |
| Mesa Verde cactus | Sclerocactus mesae-verdae | Threatened | Wherever found | 11-29-1979 |
| Metcalf Canyon jewelflower | Streptanthus albidus ssp. albidus | Endangered | Wherever found | 02-03-1995 |
| Mexican blindcat (catfish) | Prietella phreatophila | Endangered | Wherever found | 06-02-1970 |
| Mexican bobcat | Lynx (=Felis) rufus escuinapae | Endangered | Wherever found | 06-14-1976 |
| Mexican flannelbush | Fremontodendron mexicanum | Endangered | Wherever found | 10-13-1998 |
| Mexican long-nosed bat | Leptonycteris nivalis | Endangered | Wherever found | 09-30-1988 |
| Mexican prairie dog | Cynomys mexicanus | Endangered | Mexico | 06-02-1970 |
| Mexican spotted owl | Strix occidentalis lucida | Threatened | Wherever found | 03-16-1993 |
| Mexican wolf | Canis lupus baileyi | Experimental Population, Non-Essential | U.S.A. (portions of AZ and NM)see 17.84(k) | 01-24-1998 |
| Mexican wolf | Canis lupus baileyi | Endangered | Wherever found, except where included in an experimental population as set forth in 17.84(k) | 04-28-1976 |
| Mhorr gazelle | Gazella dama mhorr | Endangered | Wherever found | 06-02-1970 |
| Miami Blue Butterfly | Cyclargus (=Hemiargus) thomasi bethunebakeri | Endangered | Wherever found | 04-06-2012 |
| Miami tiger beetle | Cicindelidia floridana | Endangered | Wherever found | 11-04-2016 |
| Miccosukee gooseberry | Ribes echinellum | Threatened | | 07-18-1985 |
| Michaux's sumac | Rhus michauxii | Endangered | Wherever found | 09-28-1989 |
| Michigan monkey-flower | Mimulus michiganensis | Endangered | Wherever found | 06-21-1990 |
| Micronesian megapode | Megapodius laperouse | Endangered | Wherever found | 06-02-1970 |
| Mikado pheasant | Syrmaticus mikado | Endangered | Wherever found | 06-02-1970 |
| Military macaw | Ara militaris | Endangered | Wherever found | 11-02-2015 |
| Mindoro imperial (=zone-tailed) pigeon | Ducula mindorensis | Endangered | Wherever found | 06-14-1976 |
| Minnesota dwarf trout lily | Erythronium propullans | Endangered | Wherever found | 03-26-1986 |
| Mission blue butterfly | Icaricia icarioides missionensis | Endangered | Wherever found | 06-08-1976 |
| Mississippi sandhill crane | Grus canadensis pulla | Endangered | Wherever found | 06-04-1973 |
| Missouri bladderpod | Physaria filiformis | Threatened | Wherever found | 01-08-1987 |
| Mitchell's satyr Butterfly | Neonympha mitchellii mitchellii | Endangered | Wherever found | 06-25-1991 |
| Miyako tango (=Toyko bitterling) | Tanakia tanago | Endangered | Wherever found | 06-02-1970 |
| Moapa dace | Moapa coriacea | Endangered | Wherever found | 03-11-1967 |
| Mohave tui chub | Gila bicolor ssp. mohavensis | Endangered | Wherever found | 10-13-1970 |
| Mohr's Barbara's buttons | Marshallia mohrii | Threatened | Wherever found | 09-07-1988 |
| Molokai creeper | Paroreomyza flammea | Endangered | Wherever found | 10-13-1970 |
| Molokai thrush | Myadestes lanaiensis rutha | Endangered | Wherever found | 10-13-1970 |
| Mona boa | Epicrates monensis monensis | Threatened | Wherever found | 03-06-1978 |
| Mona ground Iguana | Cyclura stejnegeri | Threatened | Wherever found | 03-06-1978 |
| Mongolian saiga (antelope) | Saiga tatarica mongolica | Endangered | Mongolia | 06-14-1976 |
| Monterey clover | Trifolium trichocalyx | Endangered | Wherever found | 08-12-1998 |
| Monterey gilia | Gilia tenuiflora ssp. arenaria | Endangered | Wherever found | 06-22-1992 |
| Monterey spineflower | Chorizanthe pungens var. pungens | Threatened | Wherever found | 02-04-1994 |
| Monte Verde golden toad | Bufo periglenes | Endangered | Wherever found | 06-14-1976 |
| Morden's owlet | Otus ireneae | Endangered | Wherever found | 06-02-1970 |
| Morefield''s leather flower | Clematis morefieldii | Endangered | | 05-20-1992 |
| Moroccan gazelle | Gazella dorcas massaesyla | Endangered | Wherever found | 06-02-1970 |
| Morro Bay kangaroo rat | Dipodomys heermanni morroensis | Endangered | Wherever found | 10-13-1970 |
| Morro manzanita | Arctostaphylos morroensis | Threatened | Wherever found | 12-15-1994 |
| Morro shoulderband (=Banded dune) snail | Helminthoglypta walkeriana | Threatened | Wherever found | 12-15-1994 |
| Mountain anoa | Bubalus quarlesi | Endangered | Wherever found | 06-02-1970 |
| Mountain (=Cuvier's) gazelle | Gazella cuvieri | Endangered | Wherever found | 06-02-1970 |
| Mountain golden heather | Hudsonia montana | Threatened | Wherever found | 10-20-1980 |
| Mountainous Star Coral | Orbicella faveolata | Threatened | Wherever found | 11-13-2014 |
| Mountain pygmy possum | Burramys parvus | Endangered | Wherever found | 12-02-1970 |
| Mountain sweet pitcher-plant | Sarracenia rubra ssp. jonesii | Endangered | Wherever found | 09-30-1988 |
| Mountain tapir | Tapirus pinchaque | Endangered | Wherever found | 06-02-1970 |
| Mountain yellow-legged frog | Rana muscosa | Endangered | U.S.A., southern California | 07-02-2002 |
| Mountain yellow-legged frog | Rana muscosa | Endangered | U.S.A., northern California | 06-30-2014 |
| Mountain zebra | Equus zebra zebra | Endangered | Wherever found | 06-14-1976 |
| Mount Charleston blue butterfly | Icaricia (Plebejus) shasta charlestonensis | Endangered | Wherever found | 10-21-2013 |
| Mount Graham red squirrel | Tamiasciurus fremonti grahamensis | Endangered | Wherever found | 06-03-1987 |
| Mount Hermon June beetle | Polyphylla barbata | Endangered | Wherever found | 01-24-1997 |
| Mugger crocodile | Crocodylus palustris palustris | Endangered | Wherever found | 06-14-1976 |
| Munz's onion | Allium munzii | Endangered | Wherever found | 10-13-1998 |
| Musk deer | Moschus spp. (all species) | Endangered | Afghanistan, Bhutan, Burma, China (Tibet, Yunnan), India, Nepal, Pakistan, Sikkim | 06-14-1976 |
| Myrtle's silverspot butterfly | Speyeria zerene myrtleae | Endangered | Wherever found | 06-22-1992 |
| Naenae | Dubautia kalalauensis | Endangered | Wherever found | 05-13-2010 |
| Naenae | Dubautia kenwoodii | Endangered | Wherever found | 05-13-2010 |
| Na`ena`e | Dubautia herbstobatae | Endangered | Wherever found | 10-29-1991 |
| Na`ena`e | Dubautia imbricata ssp. imbricata | Endangered | Wherever found | 05-13-2010 |
| Na`ena`e | Dubautia pauciflorula | Endangered | Wherever found | 09-20-1991 |
| Na`ena`e | Dubautia plantaginea ssp. humilis | Endangered | Wherever found | 09-03-1999 |
| Na`ena`e | Dubautia plantaginea ssp. magnifolia | Endangered | Wherever found | 05-13-2010 |
| Na`ena`e | Dubautia waialealae | Endangered | Wherever found | 05-13-2010 |
| Nani wai`ale`ale | Viola kauaiensis var. wahiawaensis | Endangered | Wherever found | 10-10-1996 |
| Nanu | Gardenia mannii | Endangered | Wherever found | 10-10-1996 |
| Nanu | Gardenia remyi | Endangered | Wherever found | 10-31-2016 |
| Napa bluegrass | Poa napensis | Endangered | Wherever found | 10-22-1997 |
| Narrow-headed gartersnake | Thamnophis rufipunctatus | Threatened | Wherever found | 07-08-2014 |
| Narrownose smoothhound shark | Mustelus schmitti | Threatened | | |
| Narrow pigtoe | Fusconaia escambia | Threatened | Wherever found | 10-10-2012 |
| Narrow sawfish | Anoxypristis cuspidata | Endangered | Wherever found | 01-12-2015 |
| Nashville crayfish | Orconectes shoupi | Endangered | Wherever found | 09-26-1986 |
| Nassau grouper | Epinephelus striatus | Threatened | | 07-29-2016 |
| (=Native yellow hibiscus) ma`o hau hele | Hibiscus brackenridgei | Endangered | Wherever found | 11-10-1994 |
| Navajo sedge | Carex specuicola | Threatened | Wherever found | 05-08-1985 |
| Navasota ladies-tresses | Spiranthes parksii | Endangered | Wherever found | 05-06-1982 |
| Neches River rose-mallow | Hibiscus dasycalyx | Threatened | Wherever found | 10-11-2013 |
| nehe | Lipochaeta fauriei | Endangered | Wherever found | 02-25-1994 |
| nehe | Lipochaeta lobata var. leptophylla | Endangered | Wherever found | 10-29-1991 |
| nehe | Lipochaeta micrantha | Endangered | Wherever found | 02-25-1994 |
| nehe | Lipochaeta venosa | Endangered | Wherever found | 11-29-1979 |
| nehe | Lipochaeta waimeaensis | Endangered | Wherever found | 02-25-1994 |
| nehe | Melanthera kamolensis | Endangered | Wherever found | 05-15-1992 |
| nehe | Melanthera tenuifolia | Endangered | Wherever found | 10-29-1991 |
| Nekogigi (catfish) | Coreobagrus ichikawai | Endangered | Wherever found | 06-02-1970 |
| Nellie''s cory cactus | Escobaria minima | Endangered | Wherever found | 12-08-1979 |
| Nelson's checker-mallow | Sidalcea nelsoniana | Threatened | Wherever found | 02-12-1993 |
| Neosho madtom | Noturus placidus | Threatened | Wherever found | 05-22-1990 |
| Neosho Mucket | Lampsilis rafinesqueana | Endangered | Wherever found | 10-17-2013 |
| Neuse River waterdog | Necturus lewisi | Threatened | Wherever found | 07-09-2021 |
| Nevin's barberry | Berberis nevinii | Endangered | Wherever found | 10-13-1998 |
| Newcomb's snail | Erinna newcombi | Threatened | Wherever found | 01-26-2000 |
| Newcomb's Tree snail | Newcombia cumingi | Endangered | Wherever found | 06-27-2013 |
| Newell's Townsend's shearwater | Puffinus auricularis newelli | Threatened | Wherever found | 10-28-1975 |
| New Holland mouse | Pseudomys novaehollandiae | Endangered | Wherever found | 12-02-1970 |
| New Mexican ridge-nosed rattlesnake | Crotalus willardi obscurus | Threatened | Wherever found | 08-21-1978 |
| New Mexico meadow jumping mouse | Zapus hudsonius luteus | Endangered | Wherever found | 07-10-2014 |
| New Zealand bushwren | Xenicus longipes | Endangered | Wherever found | 06-02-1970 |
| New Zealand shore plover | Thinornis novaeseelandiae | Endangered | Wherever found | 06-02-1970 |
| New Zealand thrush (wattlebird) | Turnagra capensis | Endangered | Wherever found | 06-02-1970 |
| Niangua darter | Etheostoma nianguae | Threatened | Wherever found | 06-12-1985 |
| Nichol's Turk's head cactus | Echinocactus horizonthalonius var. nicholii | Endangered | Wherever found | 11-28-1979 |
| Nickerbean Blue Butterfly | Cyclargus ammon | Similarity of Appearance (Threatened) | Wherever found | 04-06-2012 |
| Nicklin's pearlymussel | Megalonaias nicklineana | Endangered | Wherever found | 06-14-1976 |
| Night (=Australian) parrot | Geopsittacus occidentalis | Endangered | Wherever found | 06-02-1970 |
| Nightingale reed warbler (old world warbler) | Acrocephalus luscinia | Endangered | Wherever found | 06-02-1970 |
| Nihoa finch (honeycreeper) | Telespyza ultima | Endangered | Wherever found | 03-11-1967 |
| Nihoa millerbird (old world warbler) | Acrocephalus familiaris kingi | Endangered | Wherever found | 03-11-1967 |
| Nile crocodile | Crocodylus niloticus | Threatened | Wherever found | 06-02-1970 |
| Nioi | Eugenia koolauensis | Endangered | Wherever found | 03-28-1994 |
| Nipomo Mesa lupine | Lupinus nipomensis | Endangered | Wherever found | 03-20-2000 |
| No common name | Abutilon eremitopetalum | Endangered | Wherever found | 09-20-1991 |
| No common name | Abutilon sandwicense | Endangered | Wherever found | 10-29-1991 |
| No common name | Achyranthes mutica | Endangered | Wherever found | 10-10-1996 |
| No common name | Acropora globiceps | Threatened | Wherever found | 11-13-2014 |
| No common name | Acropora jacquelinae | Threatened | Wherever found | 11-13-2014 |
| No common name | Acropora lokani | Threatened | Wherever found | 11-13-2014 |
| No common name | Acropora pharaonis | Threatened | Wherever found | 11-13-2014 |
| No common name | Acropora retusa | Threatened | Wherever found | 11-13-2014 |
| No common name | Acropora rudis | Threatened | Wherever found | 11-13-2014 |
| No common name | Acropora speciosa | Threatened | Wherever found | 11-13-2014 |
| No common name | Acropora tenella | Threatened | Wherever found | 11-13-2014 |
| No common name | Agave eggersiana | Endangered | Wherever found | 10-09-2014 |
| No common name | Amaranthus brownii | Endangered | Wherever found | 08-21-1996 |
| No common name | Anacropora spinosa | Threatened | Wherever found | 11-13-2014 |
| No common name | Aristida chaseae | Endangered | Wherever found | 04-27-1993 |
| No common name | Asplenium dielfalcatum | Endangered | Wherever found | 10-29-1991 |
| No common name | Asplenium diellaciniatum | Endangered | Wherever found | 10-31-2016 |
| No common name | Asplenium dielmannii | Endangered | Wherever found | 05-13-2010 |
| No common name | Asplenium dielpallidum | Endangered | Wherever found | 02-25-1994 |
| No common name | Asplenium peruvianum var. insulare | Endangered | Wherever found | 09-26-1994 |
| No common name | Asplenium unisorum | Endangered | Wherever found | 06-27-1994 |
| No common name | Auerodendron pauciflorum | Endangered | Wherever found | 03-02-1994 |
| No common name | Bonamia menziesii | Endangered | Wherever found | 11-10-1994 |
| No common name | Calyptranthes thomasiana | Endangered | Wherever found | 02-18-1994 |
| No common name | Cantharellus noumeae | Endangered | | 11-06-2015 |
| No common name | Catesbaea melanocarpa | Endangered | Wherever found | 03-17-1999 |
| No common name | Chamaecrista glandulosa var. mirabilis | Endangered | Wherever found | 04-05-1990 |
| No common name | Cordia bellonis | Endangered | Wherever found | 01-10-1997 |
| No common name | Cranichis ricartii | Endangered | Wherever found | 11-29-1991 |
| No common name | Cyanea kauaulaensis | Endangered | Wherever found | 10-31-2016 |
| No common name | Cyperus fauriei | Endangered | Wherever found | 03-04-1994 |
| No common name | Cyperus neokunthianus | Endangered | Wherever found | 10-31-2016 |
| No common name | Cyperus pennatiformis | Endangered | Wherever found | 11-10-1994 |
| No common name | Daphnopsis helleriana | Endangered | Wherever found | 06-23-1988 |
| No common name | Delissea rhytidosperma | Endangered | Wherever found | 02-25-1994 |
| No common name | Delissea undulata | Endangered | Wherever found | 10-10-1996 |
| No common name | Dendrobium guamense | Threatened | Wherever found | 11-02-2015 |
| No common name | Deparia kaalaana | Endangered | Wherever found | 10-31-2016 |
| No common name | Diplazium molokaiense | Endangered | Wherever found | 09-26-1994 |
| No common name | Doryopteris angelica | Endangered | Wherever found | 05-13-2010 |
| No common name | Doryopteris takeuchii | Endangered | Wherever found | 10-18-2012 |
| No common name | Elaphoglossum serpens | Endangered | Wherever found | 06-09-1993 |
| No common name | Eugenia bryanii | Endangered | Wherever found | 11-02-2015 |
| No common name | Eugenia woodburyana | Threatened | Wherever found | 09-09-1994 |
| No common name | Euphyllia paradivisa | Threatened | Wherever found | 11-13-2014 |
| No common name | Festuca hawaiiensis | Endangered | Wherever found | 10-31-2016 |
| No common name | Festuca molokaiensis | Endangered | Wherever found | 06-27-2013 |
| No common name | Geocarpon minimum | Threatened | Wherever found | 06-16-1987 |
| No common name | Gesneria pauciflora | Threatened | Wherever found | 03-07-1995 |
| No common name | Gonocalyx concolor | Endangered | Wherever found | 10-09-2014 |
| No common name | Gouania hillebrandii | Endangered | Wherever found | 11-09-1984 |
| No common name | Gouania meyenii | Endangered | Wherever found | 10-29-1991 |
| No common name | Gouania vitifolia | Endangered | Wherever found | 06-27-1994 |
| No common name | Hesperomannia arborescens | Endangered | Wherever found | 03-28-1994 |
| No common name | Hesperomannia arbuscula | Endangered | Wherever found | 10-29-1991 |
| No common name | Hesperomannia lydgatei | Endangered | Wherever found | 09-20-1991 |
| No common name | Huperzia stemmermanniae | Endangered | Wherever found | 10-31-2016 |
| No common name | Ilex sintenisii | Endangered | Wherever found | 04-22-1992 |
| No common name | Isopora crateriformis | Threatened | Wherever found | 11-13-2014 |
| No common name | Kadua degeneri | Endangered | Wherever found | 10-29-1991 |
| No common name | Kadua haupuensis | Endangered | Wherever found | 10-31-2016 |
| No common name | Kadua parvula | Endangered | Wherever found | 10-29-1991 |
| No common name | Kadua st.-johnii | Endangered | Wherever found | 09-30-1991 |
| No common name | Keysseria (=Lagenifera) erici | Endangered | Wherever found | 05-13-2010 |
| No common name | Keysseria (=Lagenifera) helenae | Endangered | Wherever found | 05-13-2010 |
| No common name | Labordia lorenciana | Endangered | Wherever found | 10-31-2016 |
| No common name | Lepidium orbiculare | Endangered | Wherever found | 10-31-2016 |
| No common name | Leptocereus grantianus | Endangered | Wherever found | 02-26-1993 |
| No common name | Lobelia koolauensis | Endangered | Wherever found | 10-10-1996 |
| No common name | Lobelia monostachya | Endangered | Wherever found | 10-10-1996 |
| No common name | Lobelia niihauensis | Endangered | Wherever found | 10-29-1991 |
| No common name | Lobelia oahuensis | Endangered | Wherever found | 03-28-1994 |
| No common name | Lyonia truncata var. proctorii | Endangered | Wherever found | 04-27-1993 |
| No common name | Lysimachia filifolia | Endangered | Wherever found | 02-25-1994 |
| No common name | Lysimachia iniki | Endangered | Wherever found | 05-13-2010 |
| No common name | Lysimachia lydgatei | Endangered | Wherever found | 05-15-1992 |
| No common name | Lysimachia maxima | Endangered | Wherever found | 10-10-1996 |
| No common name | Lysimachia pendens | Endangered | Wherever found | 05-13-2010 |
| No common name | Lysimachia scopulensis | Endangered | Wherever found | 05-13-2010 |
| No common name | Lysimachia venosa | Endangered | Wherever found | 05-13-2010 |
| No common name | Maesa walkeri | Threatened | Wherever found | 11-02-2015 |
| No common name | Microlepia strigosa var. mauiensis | Endangered | Wherever found | 10-31-2016 |
| No common name | Mitracarpus maxwelliae | Endangered | Wherever found | 09-09-1994 |
| No common name | Mitracarpus polycladus | Endangered | Wherever found | 09-09-1994 |
| No common name | Montipora australiensis | Threatened | Wherever found | 11-13-2014 |
| No common name | Myrcia paganii | Endangered | Wherever found | 02-18-1994 |
| No common name | Neraudia angulata | Endangered | Wherever found | 10-29-1991 |
| No common name | Neraudia ovata | Endangered | Wherever found | 10-10-1996 |
| No common name | Neraudia sericea | Endangered | Wherever found | 11-10-1994 |
| No common name | Nervilia jacksoniae | Threatened | Wherever found | 11-02-2015 |
| No common name | Nesogenes rotensis | Endangered | Wherever found | 04-08-2004 |
| No common name | Osmoxylon mariannense | Endangered | Wherever found | 04-08-2004 |
| No common name | Pavona diffluens | Threatened | Wherever found | 11-13-2014 |
| No common name | Phyllanthus saffordii | Endangered | Wherever found | 11-02-2015 |
| No common name | Phyllostegia bracteata | Endangered | Wherever found | 06-27-2013 |
| No common name | Phyllostegia brevidens | Endangered | Wherever found | 10-31-2016 |
| No common name | Phyllostegia floribunda | Endangered | Wherever found | 11-29-2013 |
| No common name | Phyllostegia glabra var. lanaiensis | Endangered | Wherever found | 09-20-1991 |
| No common name | Phyllostegia haliakalae | Endangered | Wherever found | 06-27-2013 |
| No common name | Phyllostegia helleri | Endangered | | 10-31-2016 |
| No common name | Phyllostegia hirsuta | Endangered | Wherever found | 10-10-1996 |
| No common name | Phyllostegia hispida | Endangered | Wherever found | 03-17-2009 |
| No common name | Phyllostegia kaalaensis | Endangered | Wherever found | 10-10-1996 |
| No common name | Phyllostegia knudsenii | Endangered | Wherever found | 10-10-1996 |
| No common name | Phyllostegia mannii | Endangered | Wherever found | 10-08-1992 |
| No common name | Phyllostegia mollis | Endangered | Wherever found | 10-29-1991 |
| No common name | Phyllostegia parviflora | Endangered | Wherever found | 10-10-1996 |
| No common name | Phyllostegia pilosa | Endangered | Wherever found | 06-27-2013 |
| No common name | Phyllostegia renovans | Endangered | Wherever found | 05-13-2010 |
| No common name | Phyllostegia stachyoides | Endangered | Wherever found | 10-31-2016 |
| No common name | Phyllostegia velutina | Endangered | Wherever found | 10-10-1996 |
| No common name | Phyllostegia waimeae | Endangered | Wherever found | 02-25-1994 |
| No common name | Phyllostegia warshaueri | Endangered | Wherever found | 10-10-1996 |
| No common name | Phyllostegia wawrana | Endangered | Wherever found | 10-10-1996 |
| No common name | Platanthera holochila | Endangered | Wherever found | 10-10-1996 |
| No common name | Platydesma cornuta var. cornuta | Endangered | Wherever found | 10-18-2012 |
| No common name | Platydesma cornuta var. decurrens | Endangered | Wherever found | 10-18-2012 |
| No common name | Platydesma remyi | Endangered | Wherever found | 11-29-2013 |
| No common name | Poa siphonoglossa | Endangered | Wherever found | 05-13-1992 |
| No common name | Polyscias bisattenuata | Endangered | Wherever found | 05-13-2010 |
| No common name | Polyscias flynnii | Endangered | Wherever found | 05-13-2010 |
| No common name | Polyscias lydgatei | Endangered | Wherever found | 10-18-2012 |
| No common name | Polyscias racemosa | Endangered | Wherever found | 02-25-1994 |
| No common name | Polystichum calderonense | Endangered | Wherever found | 06-09-1993 |
| No common name | Porites napopora | Threatened | Wherever found | 11-13-2014 |
| No common name | Pteris lidgatei | Endangered | Wherever found | 09-26-1994 |
| No common name | Remya kauaiensis | Endangered | Wherever found | 01-14-1991 |
| No common name | Remya montgomeryi | Endangered | Wherever found | 01-14-1991 |
| No common name | Sanicula mariversa | Endangered | Wherever found | 10-29-1991 |
| No common name | Sanicula purpurea | Endangered | Wherever found | 10-10-1996 |
| No common name | Sanicula sandwicensis | Endangered | Wherever found | 10-31-2016 |
| No common name | Santalum involutum | Endangered | Wherever found | 10-31-2016 |
| No common name | Schiedea attenuata | Endangered | Wherever found | 05-13-2010 |
| No common name | Schiedea diffusa ssp. macraei | Endangered | Wherever found | 11-29-2013 |
| No common name | Schiedea diffusa subsp. diffusa | Endangered | Wherever found | 10-31-2016 |
| No common name | Schiedea haleakalensis | Endangered | Wherever found | 05-15-1992 |
| No common name | Schiedea helleri | Endangered | Wherever found | 10-10-1996 |
| No common name | Schiedea hookeri | Endangered | Wherever found | 10-10-1996 |
| No common name | Schiedea jacobii | Endangered | Wherever found | 06-27-2013 |
| No common name | Schiedea kaalae | Endangered | Wherever found | 10-29-1991 |
| No common name | Schiedea kauaiensis | Endangered | Wherever found | 10-10-1996 |
| No common name | Schiedea laui | Endangered | Wherever found | 06-27-2013 |
| No common name | Schiedea lydgatei | Endangered | Wherever found | 10-08-1992 |
| No common name | Schiedea membranacea | Endangered | Wherever found | 10-10-1996 |
| No common name | Schiedea nuttallii | Endangered | Wherever found | 10-10-1996 |
| No common name | Schiedea obovata | Endangered | Wherever found | 10-29-1991 |
| No common name | Schiedea salicaria | Endangered | Wherever found | 06-27-2013 |
| No common name | Schiedea sarmentosa | Endangered | Wherever found | 10-10-1996 |
| No common name | Schiedea spergulina var. leiopoda | Endangered | Wherever found | 02-25-1994 |
| No common name | Schiedea spergulina var. spergulina | Threatened | Wherever found | 02-25-1994 |
| No common name | Schiedea trinervis | Endangered | Wherever found | 10-29-1991 |
| No common name | Schiedea verticillata | Endangered | Wherever found | 08-21-1996 |
| No common name | Schiedea viscosa | Endangered | Wherever found | 10-10-1996 |
| No common name | Schoepfia arenaria | Threatened | Wherever found | 04-19-1991 |
| No common name | Seriatopora aculeata | Threatened | Wherever found | 11-13-2014 |
| No common name | Sicyos lanceoloideus | Endangered | Wherever found | 10-31-2016 |
| No common name | Siderastrea glynni | Endangered | | 11-06-2015 |
| No common name | Silene alexandri | Endangered | Wherever found | 10-08-1992 |
| No common name | Silene hawaiiensis | Threatened | Wherever found | 03-04-1994 |
| No common name | Silene lanceolata | Endangered | Wherever found | 10-08-1992 |
| No common name | Silene perlmanii | Endangered | Wherever found | 10-29-1991 |
| No common name | Spermolepis hawaiiensis | Endangered | Wherever found | 11-10-1994 |
| No common name | Stenogyne angustifolia var. angustifolia | Endangered | Wherever found | 11-29-1979 |
| No common name | Stenogyne bifida | Endangered | Wherever found | 10-08-1992 |
| No common name | Stenogyne campanulata | Endangered | Wherever found | 05-13-1992 |
| No common name | Stenogyne cranwelliae | Endangered | Wherever found | 11-29-2013 |
| No common name | Stenogyne kaalae ssp. sherffii | Endangered | Wherever found | 10-31-2016 |
| No common name | Stenogyne kanehoana | Endangered | Wherever found | 05-13-1992 |
| No common name | Stenogyne kauaulaensis | Endangered | Wherever found | 06-27-2013 |
| No common name | Stenogyne kealiae | Endangered | Wherever found | 05-13-2010 |
| No common name | Tabernaemontana rotensis | Threatened | Wherever found | 11-02-2015 |
| No common name | Tectaria estremerana | Endangered | Wherever found | 06-09-1993 |
| No common name | Ternstroemia subsessilis | Endangered | Wherever found | 04-22-1992 |
| No common name | Tetramolopium arenarium | Endangered | Wherever found | 03-04-1994 |
| No common name | Tetramolopium filiforme | Endangered | Wherever found | 10-29-1991 |
| No common name | Tetramolopium lepidotum ssp. lepidotum | Endangered | Wherever found | 10-29-1991 |
| No common name | Tetramolopium remyi | Endangered | Wherever found | 09-20-1991 |
| No common name | Tetramolopium rockii | Threatened | Wherever found | 10-08-1992 |
| No common name | Thelypteris inabonensis | Endangered | Wherever found | 07-02-1993 |
| No common name | Thelypteris verecunda | Endangered | Wherever found | 07-02-1993 |
| No common name | Thelypteris yaucoensis | Endangered | Wherever found | 07-02-1993 |
| No common name | Tinospora homosepala | Endangered | Wherever found | 11-02-2015 |
| No common name | Trematolobelia singularis | Endangered | Wherever found | 10-10-1996 |
| No common name | Tubastraea floreana | Endangered | | 11-06-2015 |
| No common name | Tuberolabium guamense | Threatened | Wherever found | 11-02-2015 |
| No common name | Varronia rupicola | Threatened | Wherever found | 10-09-2014 |
| No common name | Vernonia proctorii | Endangered | Wherever found | 04-27-1993 |
| No common name | Vigna o-wahuensis | Endangered | Wherever found | 11-10-1994 |
| No common name | Viola helenae | Endangered | Wherever found | 09-20-1991 |
| No common name | Viola lanaiensis | Endangered | Wherever found | 09-20-1991 |
| No common name | Viola oahuensis | Endangered | Wherever found | 10-10-1996 |
| No common name | Wikstroemia skottsbergiana | Endangered | | 10-31-2016 |
| No common name | Wikstroemia villosa | Endangered | Wherever found | 06-27-2013 |
| No common name | Xylosma crenatum | Endangered | Wherever found | 05-13-1992 |
| [no common name] Beetle | Rhadine exilis | Endangered | Wherever found | 12-26-2000 |
| [no common name] Beetle | Rhadine infernalis | Endangered | Wherever found | 12-26-2000 |
| Noel's Amphipod | Gammarus desperatus | Endangered | Wherever found | 08-09-2005 |
| Nohoanu | Geranium arboreum | Endangered | Wherever found | 05-13-1992 |
| Nohoanu | Geranium hanaense | Endangered | Wherever found | 06-27-2013 |
| Nohoanu | Geranium hillebrandii | Endangered | Wherever found | 06-27-2013 |
| Nohoanu | Geranium kauaiense | Endangered | Wherever found | 05-13-2010 |
| Nohoanu | Geranium multiflorum | Endangered | Wherever found | 05-15-1992 |
| Noisy scrub-bird | Atrichornis clamosus | Endangered | Wherever found | 06-02-1970 |
| noonday snail | Mesodon clarki nantahala | Threatened | Wherever found | 08-02-1978 |
| Nordmann's greenshank | Tringa guttifer | Endangered | Wherever found | 06-14-1976 |
| Norfolk Island parakeet | Cyanoramphus cookii (=novaezelandiae c.) | Endangered | Wherever found | 09-28-1990 |
| Norfolk Island white-eye | Zosterops albogularis | Endangered | Wherever found | 06-14-1976 |
| North Andean huemul | Hippocamelus antisensis | Endangered | Wherever found | 06-14-1976 |
| North Atlantic Right Whale | Eubalaena glacialis | Endangered | Wherever found | 06-02-1970 |
| North China sika deer | Cervus nippon mandarinus | Endangered | Wherever found | 07-27-1979 |
| Northeastern beach tiger beetle | Habroscelimorpha dorsalis dorsalis | Threatened | Wherever found | 08-07-1990 |
| Northeastern bulrush | Scirpus ancistrochaetus | Endangered | | 05-07-1991 |
| Northern Aplomado Falcon | Falco femoralis septentrionalis | Endangered | Wherever found, except where listed as an experimental population | 02-25-1986 |
| Northern Aplomado Falcon | Falco femoralis septentrionalis | Experimental Population, Non-Essential | U.S.A (AZ, NM) | 07-26-2006 |
| Northern bald ibis | Geronticus eremita | Endangered | Wherever found | 09-28-1990 |
| Northern Idaho Ground Squirrel | Urocitellus brunneus | Threatened | Wherever found | 04-05-2000 |
| Northern Long-Eared Bat | Myotis septentrionalis | Endangered | Wherever found | 05-04-2015 |
| Northern Mexican gartersnake | Thamnophis eques megalops | Threatened | Wherever found | 07-08-2014 |
| Northern riffleshell | Epioblasma rangiana | Endangered | Wherever found | 01-22-1993 |
| Northern Sea Otter | Enhydra lutris kenyoni | Threatened | Southwest Alaska, from Attu Island to Western Cook Inlet, including Bristol Bay, the Kodiak Archipelago, and the Barren Islands | 08-09-2005 |
| Northern spotted owl | Strix occidentalis caurina | Threatened | Wherever found | 06-26-1990 |
| Northern swift fox | Vulpes velox hebes | Endangered | Canada | 06-02-1970 |
| Northern white rhinoceros | Ceratotherium simum cottoni | Endangered | Zaire, Uganda, Sudan, Central African Republic | 06-02-1970 |
| Northern wild monkshood | Aconitum noveboracense | Threatened | Wherever found | 05-27-1978 |
| North Pacific Right Whale | Eubalaena japonica | Endangered | Wherever found | 06-02-1970 |
| North Park phacelia | Phacelia formosula | Endangered | Wherever found | 09-01-1982 |
| Numbat | Myrmecobius fasciatus | Endangered | Wherever found | 12-02-1970 |
| Oahu creeper | Paroreomyza maculata | Endangered | Wherever found | 10-13-1970 |
| Oahu elepaio | Chasiempis ibidis | Endangered | Wherever found | 04-18-2000 |
| Oahu tree snails | Achatinella spp. | Endangered | Wherever found | 02-12-1981 |
| Oceanic Hawaiian damselfly | Megalagrion oceanicum | Endangered | Wherever found | 10-18-2012 |
| Oceanic whitetip shark | Carcharhinus longimanus | Threatened | | |
| Ocelot | Leopardus (=Felis) pardalis | Endangered | wherever found | 03-28-1972 |
| Ochlockonee moccasinshell | Medionidus simpsonianus | Endangered | Wherever found | 03-16-1998 |
| Oha | Delissea subcordata | Endangered | Wherever found | 10-10-1996 |
| Ohai | Sesbania tomentosa | Endangered | Wherever found | 11-10-1994 |
| `Oha wai | Clermontia drepanomorpha | Endangered | Wherever found | 10-10-1996 |
| `Oha wai | Clermontia lindseyana | Endangered | Wherever found | 03-04-1994 |
| `Oha wai | Clermontia oblongifolia ssp. brevipes | Endangered | Wherever found | 10-08-1992 |
| `Oha wai | Clermontia oblongifolia ssp. mauiensis | Endangered | Wherever found | 05-15-1992 |
| `Oha wai | Clermontia peleana | Endangered | Wherever found | 03-04-1994 |
| `Oha wai | Clermontia pyrularia | Endangered | Wherever found | 03-04-1994 |
| `Oha wai | Clermontia samuelii | Endangered | Wherever found | 09-03-1999 |
| `Ohe | Joinvillea ascendens ascendens | Endangered | Wherever found | 10-31-2016 |
| `Ohe`ohe | Polyscias gymnocarpa | Endangered | Wherever found | 03-28-1994 |
| Ohlone tiger beetle | Cicindela ohlone | Endangered | Wherever found | 10-03-2001 |
| Okaloosa darter | Etheostoma okaloosae | Threatened | Wherever found | 06-04-1973 |
| Okeechobee gourd | Cucurbita okeechobeensis ssp. okeechobeensis | Endangered | | 07-12-1993 |
| Olive ridley sea turtle | Lepidochelys olivacea | Threatened | Wherever found, except when listed as endangered under 50 CFR 224.101 | 07-28-1978 |
| Olive ridley sea turtle | Lepidochelys olivacea | Endangered | Breeding colony populations on Pacific coast of Mexico | 07-28-1978 |
| olua | Hypolepis hawaiiensis var. mauiensis | Endangered | Wherever found | 10-31-2016 |
| Olulu | Brighamia insignis | Endangered | Wherever found | 02-25-1994 |
| Olympia pocket gopher | Thomomys mazama pugetensis | Threatened | Wherever found | 05-09-2014 |
| Opuhe | Urera kaalae | Endangered | Wherever found | 10-29-1991 |
| Orange-bellied parakeet | Neophema chrysogaster | Endangered | Wherever found | 12-02-1970 |
| Orangeblack Hawaiian damselfly | Megalagrion xanthomelas | Endangered | Wherever found | 10-31-2016 |
| Orangefoot pimpleback (pearlymussel) | Plethobasus cooperianus | Endangered | Wherever found | 06-14-1976 |
| Orangefoot pimpleback (pearlymussel) | Plethobasus cooperianus | Experimental Population, Non-Essential | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 10-15-2007 |
| Orangenacre mucket | Hamiota perovalis | Threatened | Wherever found | 03-17-1993 |
| Orangutan | Pongo pygmaeus | Endangered | Wherever found | 06-02-1970 |
| Orcutt's spineflower | Chorizanthe orcuttiana | Endangered | Wherever found | 10-07-1996 |
| Oregon silverspot butterfly | Speyeria zerene hippolyta | Threatened | Wherever found | 07-02-1980 |
| Oregon silverspot butterfly | Speyeria zerene hippolyta | Experimental Population, Non-Essential | | 06-23-2017 |
| Oregon spotted frog | Rana pretiosa | Threatened | Wherever found | 09-29-2014 |
| Oriental white stork | Ciconia boyciana (=ciconia b.) | Endangered | Wherever found | 06-02-1970 |
| Orinoco crocodile | Crocodylus intermedius | Endangered | Wherever found | 06-02-1970 |
| Osterhout milkvetch | Astragalus osterhoutii | Endangered | Wherever found | 07-13-1989 |
| Otay mesa-mint | Pogogyne nudiuscula | Endangered | Wherever found | 08-03-1993 |
| Otay tarplant | Deinandra (=Hemizonia) conjugens | Threatened | Wherever found | 10-13-1998 |
| Ouachita rock pocketbook | Arcidens wheeleri | Endangered | Wherever found | 10-23-1991 |
| `O`u (honeycreeper) | Psittirostra psittacea | Endangered | Wherever found | 03-11-1967 |
| Oval pigtoe | Pleurobema pyriforme | Endangered | Wherever found | 03-16-1998 |
| Ovate clubshell | Pleurobema perovatum | Endangered | Wherever found | 03-17-1993 |
| Owens pupfish | Cyprinodon radiosus | Endangered | Wherever found | 03-11-1967 |
| Owens Tui Chub | Gila bicolor ssp. snyderi | Endangered | Wherever found | 08-05-1985 |
| Oyster mussel | Epioblasma capsaeformis | Endangered | Wherever found; Except where listed as Experimental Populations | 01-10-1997 |
| Oyster mussel | Epioblasma capsaeformis | Experimental Population, Non-Essential | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 10-15-2007 |
| Oyster mussel | Epioblasma capsaeformis | Experimental Population, Non-Essential | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 06-14-2001 |
| Ozark big-eared bat | Corynorhinus (=Plecotus) townsendii ingens | Endangered | Wherever found | 11-30-1979 |
| Ozark cavefish | Amblyopsis rosae | Threatened | Wherever found | 11-01-1984 |
| Ozark Hellbender | Cryptobranchus alleganiensis bishopi | Endangered | Wherever found | 11-07-2011 |
| Pacific Hawaiian damselfly | Megalagrion pacificum | Endangered | Wherever found | 07-26-2010 |
| Pacific Marten, Coastal Distinct Population Segment | Martes caurina | Threatened | Wherever found | 11-09-2020 |
| Pacific pocket mouse | Perognathus longimembris pacificus | Endangered | Wherever found | 02-03-1994 |
| Pacific sheath-tailed Bat | Emballonura semicaudata rotensis | Endangered | Wherever found | 11-02-2015 |
| Pacific sheath-tailed Bat | Emballonura semicaudata semicaudata | Endangered | American Samoa | 10-24-2016 |
| Pagi Island langur | Nasalis concolor | Endangered | Wherever found | 06-02-1970 |
| Pagosa skyrocket | Ipomopsis polyantha | Endangered | Wherever found | 08-26-2011 |
| Pahranagat roundtail chub | Gila robusta jordani | Endangered | Wherever found | 10-13-1970 |
| Pahrump poolfish | Empetrichthys latos | Endangered | Wherever found | 03-11-1967 |
| Pa`iniu | Astelia waialealae | Endangered | Wherever found | 05-13-2010 |
| Painted rocksnail | Leptoxis taeniata | Threatened | Wherever found | 10-28-1998 |
| Painted snake coiled forest snail | Anguispira picta | Threatened | Wherever found | 08-02-1978 |
| Paiute cutthroat trout | Oncorhynchus clarkii seleniris | Threatened | Wherever found | 03-11-1967 |
| Pakistan sand cat | Felis margarita scheffeli | Endangered | Wherever found | 01-23-1984 |
| Palapalai aumakua | Dryopteris crinalis var. podosorus | Endangered | Wherever found | 05-13-2010 |
| Palawan peacock pheasant | Polyplectron emphanum | Endangered | Wherever found | 06-02-1970 |
| Pale lilliput (pearlymussel) | Toxolasma cylindrellus | Endangered | Wherever found | 06-14-1976 |
| Palezone shiner | Notropis albizonatus | Endangered | Wherever found | 04-27-1993 |
| Palila (honeycreeper) | Loxioides bailleui | Endangered | Wherever found | 03-11-1967 |
| Pallid manzanita | Arctostaphylos pallida | Threatened | Wherever found | 04-22-1998 |
| Pallid sturgeon | Scaphirhynchus albus | Endangered | Wherever found | 09-06-1990 |
| Palma de manaca | Calyptronoma rivalis | Threatened | Wherever found | 02-06-1990 |
| Palmate-bracted bird's beak | Cordylanthus palmatus | Endangered | Wherever found | 07-01-1986 |
| Palo colorado | Ternstroemia luquillensis | Endangered | Wherever found | 04-22-1992 |
| Palo de jazmin | Styrax portoricensis | Endangered | Wherever found | 04-22-1992 |
| Palo de nigua | Cornutia obovata | Endangered | Wherever found | 04-07-1988 |
| Palo de ramon | Banara vanderbiltii | Endangered | Wherever found | 01-14-1987 |
| Palo de rosa | Ottoschulzia rhodoxylon | Threatened | Wherever found | 04-10-1990 |
| Palos Verdes blue butterfly | Glaucopsyche lygdamus palosverdesensis | Endangered | Wherever found | 07-02-1980 |
| Pamakani | Tetramolopium capillare | Endangered | Wherever found | 09-30-1994 |
| Pamakani | Viola chamissoniana ssp. chamissoniana | Endangered | Wherever found | 10-29-1991 |
| Pampas deer | Ozotoceros bezoarticus | Endangered | Wherever found | 06-14-1976 |
| Panama City crayfish | Procambarus econfinae | Threatened | Wherever found | 02-04-2022 |
| Panamanian golden frog | Atelopus varius zeteki | Endangered | Wherever found | 06-14-1976 |
| Panamanian jaguarundi | Herpailurus (=Felis) yagouaroundi panamensis | Endangered | Wherever found | 06-14-1976 |
| Papala | Charpentiera densiflora | Endangered | Wherever found | 05-13-2010 |
| Papery whitlow-wort | Paronychia chartacea | Threatened | | 01-21-1987 |
| Parachute beardtongue | Penstemon debilis | Threatened | Wherever found | 08-26-2011 |
| Paradise parakeet | Psephotus pulcherrimus | Endangered | Wherever found | 12-02-1970 |
| Pariette cactus | Sclerocactus brevispinus | Threatened | Wherever found | 09-15-2009 |
| Parish's daisy | Erigeron parishii | Threatened | Wherever found | 08-24-1994 |
| Parma wallaby | Macropus parma | Endangered | Wherever found | 12-02-1970 |
| Paudedo | Hedyotis megalantha | Endangered | Wherever found | 11-02-2015 |
| Pauoa | Ctenitis squamigera | Endangered | Wherever found | 09-26-1994 |
| Pawnee montane skipper | Hesperia leonardus montana | Threatened | Wherever found | 09-25-1987 |
| Peacock softshell turtle | Trionyx hurum | Endangered | Wherever found | 06-14-1976 |
| Pearl darter | Percina aurora | Threatened | Wherever found | 10-20-2017 |
| Peck's cave amphipod | Stygobromus (=Stygonectes) pecki | Endangered | Wherever found | 12-18-1997 |
| Pecos amphipod | Gammarus pecos | Endangered | Wherever found | 07-09-2013 |
| Pecos assiminea snail | Assiminea pecos | Endangered | Wherever found | 08-09-2005 |
| Pecos bluntnose shiner | Notropis simus pecosensis | Threatened | Wherever found | 02-20-1987 |
| Pecos gambusia | Gambusia nobilis | Endangered | Wherever found | 10-13-1970 |
| Pecos (=puzzle, =paradox) sunflower | Helianthus paradoxus | Threatened | Wherever found | 10-20-1999 |
| Pedate checker-mallow | Sidalcea pedata | Endangered | Wherever found | 08-31-1984 |
| Pederseni''s Tiger Spider | Poecilotheria vittata | Endangered | Wherever found | 08-30-2018 |
| Peebles Navajo cactus | Pediocactus peeblesianus ssp. peeblesianus | Endangered | Wherever found | 11-28-1979 |
| Peirson's milk-vetch | Astragalus magdalenae var. peirsonii | Threatened | Wherever found | 10-06-1998 |
| Pelos del diablo | Aristida portoricensis | Endangered | Wherever found | 08-08-1990 |
| Pelzeln's gazelle | Gazella dorcas pelzelni | Endangered | Wherever found | 07-27-1979 |
| Pendant kihi fern | Adenophorus periens | Endangered | Wherever found | 11-10-1994 |
| Peninsular bighorn sheep | Ovis canadensis nelsoni | Endangered | U.S.A. (CA) Peninsular Ranges | 03-18-1998 |
| Peninsular pronghorn | Antilocapra americana peninsularis | Endangered | Mexico (Baja California) | 10-28-1975 |
| Penland alpine fen mustard | Eutrema penlandii | Threatened | Wherever found | 07-28-1993 |
| Penland beardtongue | Penstemon penlandii | Endangered | Wherever found | 07-13-1989 |
| Pennell's bird's-beak | Cordylanthus tenuis ssp. capillaris | Endangered | Wherever found | 02-03-1995 |
| Peppered chub | Macrhybopsis tetranema | Endangered | Wherever found | 03-30-2022 |
| Perdido Key beach mouse | Peromyscus polionotus trissyllepsis | Endangered | Wherever found | 06-06-1985 |
| Persian fallow deer | Dama mesopotamica (=dama m.) | Endangered | Wherever found | 06-02-1970 |
| Persistent trillium | Trillium persistens | Endangered | Wherever found | 05-27-1978 |
| Peruvian plantcutter | Phytotoma raimondii | Endangered | Wherever found | 07-24-2012 |
| Peter's Mountain mallow | Iliamna corei | Endangered | Wherever found | 05-12-1986 |
| Phantom Springsnail | Pyrgulopsis texana | Endangered | Wherever found | 08-08-2013 |
| Phantom Tryonia | Tryonia cheatumi | Endangered | Wherever found | 07-09-2013 |
| Philippine cockatoo | Cacatua haematuropygia | Endangered | Wherever found | 06-24-2014 |
| Philippine crocodile | Crocodylus novaeguineae mindorensis | Endangered | Wherever found | 06-14-1976 |
| Philippine eagle | Pithecophaga jefferyi | Endangered | Wherever found | 06-02-1970 |
| Philippine tarsier | Tarsius syrichta | Threatened | Wherever found | 10-19-1976 |
| Pied tamarin | Saguinus bicolor | Endangered | Wherever found | 10-19-1976 |
| Pigeon wings | Clitoria fragrans | Threatened | | 04-27-1993 |
| Pig-footed bandicoot | Chaeropus ecaudatus | Endangered | Wherever found | 12-02-1970 |
| Pillar Coral | Dendrogyra cylindrus | Threatened | Wherever found | 11-13-2014 |
| pilo | Kadua laxiflora | Endangered | Wherever found | 10-08-1992 |
| Pilo kea lau li`i | Platydesma rostrata | Endangered | Wherever found | 05-13-2010 |
| Pima pineapple cactus | Coryphantha scheeri var. robustispina | Endangered | Wherever found | 09-23-1993 |
| Pine Hill ceanothus | Ceanothus roderickii | Endangered | Wherever found | 10-18-1996 |
| Pine Hill flannelbush | Fremontodendron californicum ssp. decumbens | Endangered | Wherever found | 10-18-1996 |
| Pineland sandmat | Chamaesyce deltoidea pinetorum | Threatened | | 10-06-2017 |
| Pink fairy armadillo | Chlamyphorus truncatus | Endangered | Wherever found | 06-02-1970 |
| Pink-headed duck | Rhodonessa caryophyllacea | Endangered | Wherever found | 06-14-1976 |
| Pink mucket (pearlymussel) | Lampsilis abrupta | Endangered | Wherever found | 06-14-1976 |
| Pink pigeon | Columba mayeri | Endangered | Wherever found | 01-12-1995 |
| Piping Plover | Charadrius melodus | Threatened | [Atlantic Coast and Northern Great Plains populations] - Wherever found, except those areas where listed as endangered. | 12-11-1985 |
| Piping Plover | Charadrius melodus | Endangered | [Great Lakes watershed DPS] - Great Lakes, watershed in States of IL, IN, MI, MN, NY, OH, PA, and WI and Canada (Ont.) | 12-11-1985 |
| Pismo clarkia | Clarkia speciosa ssp. immaculata | Endangered | Wherever found | 12-15-1994 |
| Pitcher's thistle | Cirsium pitcheri | Threatened | Wherever found | 07-18-1988 |
| Pitkin Marsh lily | Lilium pardalinum ssp. pitkinense | Endangered | Wherever found | 10-22-1997 |
| Plains wanderer (=collared-hemipode) | Pedionomus torquatus | Endangered | Wherever found | 06-04-1973 |
| Plicate rocksnail | Leptoxis plicata | Endangered | Wherever found | 10-28-1998 |
| Plymouth Redbelly Turtle | Pseudemys rubriventris bangsi | Endangered | Wherever found | 04-02-1980 |
| Po`e | Portulaca sclerocarpa | Endangered | Wherever found | 03-04-1994 |
| Point Arena mountain beaver | Aplodontia rufa nigra | Endangered | Wherever found | 12-12-1991 |
| Polar bear | Ursus maritimus | Threatened | Wherever found | 05-15-2008 |
| Pollen's vanga | Xenopirostris polleni | Threatened | Wherever found | 01-12-1995 |
| Ponape greater white-eye | Rukia longirostra | Endangered | Wherever found | 06-02-1970 |
| Ponape mountain starling | Aplonis pelzelni | Endangered | Wherever found | 06-02-1970 |
| Pondberry | Lindera melissifolia | Endangered | Wherever found | 07-31-1986 |
| Po`ouli (honeycreeper) | Melamprosops phaeosoma | Endangered | Wherever found | 10-28-1975 |
| Popolo | Cyanea solanacea | Endangered | Wherever found | 06-27-2013 |
| Popolo | Solanum nelsonii | Endangered | Wherever found | 10-31-2016 |
| Popolo ku mai | Solanum incompletum | Endangered | Wherever found | 11-10-1994 |
| Poweshiek skipperling | Oarisma poweshiek | Endangered | Wherever found | 11-24-2014 |
| Prairie bush-clover | Lespedeza leptostachya | Threatened | Wherever found | 01-09-1987 |
| Preble's meadow jumping mouse | Zapus hudsonius preblei | Threatened | wherever found | 05-13-1998 |
| Presidio clarkia | Clarkia franciscana | Endangered | Wherever found | 02-03-1995 |
| Presidio Manzanita | Arctostaphylos hookeri var. ravenii | Endangered | Wherever found | 11-29-1979 |
| Preuss' red colobus monkey | Procolobus (=Colobus) preussi (=badius p.) | Endangered | Wherever found | 01-23-1984 |
| Price''s potato-bean | Apios priceana | Threatened | | 01-05-1990 |
| Proboscis monkey | Nasalis larvatus | Endangered | Wherever found | 06-14-1976 |
| Prostrate milkweed | Asclepias prostrata | Endangered | | 03-30-2023 |
| Przewalski's horse | Equus przewalskii | Endangered | Wherever found | 06-14-1976 |
| Pua `ala | Brighamia rockii | Endangered | Wherever found | 10-08-1992 |
| Pudu | Pudu pudu | Endangered | Wherever found | 06-14-1976 |
| Puerto Rican boa | Chilabothrus inornatus | Endangered | Wherever found | 10-13-1970 |
| Puerto Rican broad-winged hawk | Buteo platypterus brunnescens | Endangered | Wherever found | 09-09-1994 |
| Puerto Rican crested toad | Peltophryne lemur | Threatened | Wherever found | 08-04-1987 |
| Puerto Rican harlequin butterfly | Atlantea tulita | Threatened | Wherever found | 01-03-2023 |
| Puerto Rican nightjar | Caprimulgus noctitherus | Endangered | Wherever found | 06-04-1973 |
| Puerto Rican parrot | Amazona vittata | Endangered | Wherever found | 03-11-1967 |
| Puerto Rican plain Pigeon | Columba inornata wetmorei | Endangered | Wherever found | 10-13-1970 |
| Puerto Rican sharp-shinned hawk | Accipiter striatus venator | Endangered | Wherever found | 09-09-1994 |
| Puma (=mountain lion) | Puma (=Felis) concolor (all subsp. except coryi) | Similarity of Appearance (Threatened) | U.S.A. (FL) | 08-14-1991 |
| Puritan tiger beetle | Ellipsoptera puritana | Threatened | Wherever found | 08-07-1990 |
| Purple amole | Chlorogalum purpureum | Threatened | Wherever found | 03-20-2000 |
| Purple bankclimber (mussel) | Elliptoideus sloatianus | Threatened | Wherever found | 03-16-1998 |
| Purple bean | Villosa perpurpurea | Endangered | Wherever found | 01-10-1997 |
| Purple Cat's paw (=Purple Cat's paw pearlymussel) | Epioblasma obliquata | Endangered | Wherever found; Except where listed as Experimental Populations | 07-10-1990 |
| Purple Cat's paw (=Purple Cat's paw pearlymussel) | Epioblasma obliquata | Experimental Population, Non-Essential | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 06-14-2001 |
| Purple-faced langur | Presbytis senex | Threatened | Wherever found | 10-19-1976 |
| Pu`uka`a | Cyperus trachysanthos | Endangered | Wherever found | 10-10-1996 |
| Pygmy chimpanzee | Pan paniscus | Endangered | Wherever found | 10-19-1976 |
| Pygmy fringe-tree | Chionanthus pygmaeus | Endangered | | 01-21-1987 |
| Pygmy hog | Sus salvanius | Endangered | Wherever found | 06-02-1970 |
| Pygmy madtom | Noturus stanauli | Experimental Population, Non-Essential | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.84(t)(1)(i)) | 10-15-2007 |
| Pygmy madtom | Noturus stanauli | Endangered | Wherever found | 04-27-1993 |
| Pygmy Rabbit | Brachylagus idahoensis | Endangered | Columbia Basin DPS (WA-Douglas, Grant, Lincoln, Adams, Benton Counties) | 11-30-2001 |
| Pygmy Sculpin | Cottus paulus (=pygmaeus) | Threatened | Wherever found | 09-28-1989 |
| Pyrenean ibex | Capra pyrenaica pyrenaica | Endangered | Wherever found | 06-02-1970 |
| Queen Alexandra's birdwing butterfly | Troides alexandrae | Endangered | Wherever found | 09-21-1989 |
| Queen Charlotte goshawk | Accipiter gentilis laingi | Threatened | British Columbia, Canada | 08-31-2012 |
| Queensland hairy-nosed wombat (incl. Barnard's) | Lasiorhinus krefftii (formerly L. barnardi and L. gillespiei) | Endangered | Wherever found | 12-02-1970 |
| Queensland rat-kangaroo | Bettongia tropica | Endangered | Wherever found | 12-02-1970 |
| Quino checkerspot butterfly | Euphydryas editha quino (=E. e. wrighti) | Endangered | Wherever found | 01-16-1997 |
| Quokka | Setonix brachyurus | Endangered | Wherever found | 06-04-1973 |
| Rabbit bandicoot | Macrotis lagotis | Endangered | Wherever found | 12-02-1970 |
| Rabbitsfoot | Quadrula cylindrica cylindrica | Threatened | Wherever found | 10-17-2013 |
| Railroad Valley springfish | Crenichthys nevadae | Threatened | Wherever found | 03-31-1986 |
| Raso lark | Alauda razae | Endangered | Wherever found | 01-12-1995 |
| Rayed Bean | Villosa fabalis | Endangered | Wherever found | 03-15-2012 |
| Razorback sucker | Xyrauchen texanus | Endangered | Wherever found | 10-23-1991 |
| Razor-billed curassow | Mitu mitu mitu | Endangered | Wherever found | 06-14-1976 |
| Red-backed squirrel monkey | Saimiri oerstedii | Endangered | Wherever found | 06-02-1970 |
| Red-bellied monkey | Cercopithecus erythrogaster | Endangered | Wherever found | 10-19-1976 |
| Red-billed curassow | Crax blumenbachii | Endangered | Wherever found | 12-02-1970 |
| Red-browed parrot | Amazona rhodocorytha | Endangered | Wherever found | 06-02-1970 |
| Red-capped parrot | Pionopsitta pileata | Endangered | Wherever found | 06-14-1976 |
| Red-cockaded woodpecker | Picoides borealis | Endangered | Wherever found | 10-13-1970 |
| Red-eared nose-spotted monkey | Cercopithecus erythrotis | Endangered | Wherever found | 10-19-1976 |
| Red-faced malkoha (cuckoo) | Phaenicophaeus pyrrhocephalus | Endangered | Wherever found | 06-02-1970 |
| Red Hills salamander | Phaeognathus hubrichti | Threatened | Wherever found | 01-03-1977 |
| Red Hills vervain | Verbena californica | Threatened | Wherever found | 10-14-1998 |
| Red knot | Calidris canutus rufa | Threatened | Wherever found | 01-12-2015 |
| Red lechwe | Kobus leche | Threatened | Wherever found | 06-02-1970 |
| Red-necked parrot | Amazona arausiaca | Endangered | Wherever found | 07-27-1979 |
| Red siskin | Carduelis cucullata | Endangered | Wherever found | 06-14-1976 |
| Red-spectacled parrot | Amazona pretrei pretrei | Endangered | Wherever found | 06-14-1976 |
| Red-tailed parrot | Amazona brasiliensis | Endangered | Wherever found | 09-28-1990 |
| Red wolf | Canis rufus | Experimental Population, Non-Essential | U.S.A. (portions of NC and TN see 17.84(c)(9)) | 11-19-1986 |
| Red wolf | Canis rufus | Endangered | Wherever found, except where listed as an experimental population | 03-11-1967 |
| Relict darter | Etheostoma chienense | Endangered | Wherever found | 12-27-1993 |
| Relict gull | Larus relictus | Endangered | Wherever found | 06-14-1976 |
| Relict trillium | Trillium reliquum | Endangered | Wherever found | 04-04-1988 |
| Resplendent quetzel | Pharomachrus mocinno ssp. mocinno | Endangered | Wherever found | 06-14-1976 |
| Reticulated flatwoods salamander | Ambystoma bishopi | Endangered | Wherever found | 02-10-2009 |
| Reunion cuckoo-shrike | Coquus newtoni | Endangered | Wherever found | 06-02-1970 |
| Ringed map turtle | Graptemys oculifera | Threatened | Wherever found | 12-23-1986 |
| Ringed seal | Phoca (=Pusa) hispida ladogensis | Endangered | Ladoga subspecies | 02-26-2013 |
| Ringed Seal | Phoca (=Pusa) hispida botnica | Threatened | Wherever found | 02-26-2013 |
| Ringed Seal | Phoca (=Pusa) hispida hispida | Threatened | Wherever found | 02-26-2013 |
| Ringed Seal | Phoca (=Pusa) hispida ochotensis | Threatened | Okhotsk subspecies | 02-26-2013 |
| Ring pink (mussel) | Obovaria retusa | Experimental Population, Non-Essential | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 10-15-2007 |
| Ring pink (mussel) | Obovaria retusa | Endangered | Wherever found | 09-29-1989 |
| Rio de Oro Dama gazelle | Gazella dama lozanoi | Endangered | Wherever found | 06-02-1970 |
| Rio Grande Silvery Minnow | Hybognathus amarus | Endangered | Wherever found, except where listed as an experimental population | 07-20-1994 |
| Rio Grande Silvery Minnow | Hybognathus amarus | Experimental Population, Non-Essential | Rio Grande, from Little Box Canyon (approximately 10.4 river miles downstream of Fort Quitman, TX) to Amistad Dam; and on the Pecos River, from its confluence with Independence Creek to its confluence with the Rio Grande | 12-08-2008 |
| Riparian brush rabbit | Sylvilagus bachmani riparius | Endangered | Wherever found | 02-23-2000 |
| Riparian woodrat (=San Joaquin Valley) | Neotoma fuscipes riparia | Endangered | Wherever found | 02-23-2000 |
| Riverside fairy shrimp | Streptocephalus woottoni | Endangered | Wherever found | 08-03-1993 |
| River terrapin | Batagur baska | Endangered | Wherever found | 06-02-1970 |
| Roan Mountain bluet | Hedyotis purpurea var. montana | Endangered | Wherever found | 04-05-1990 |
| Roanoke logperch | Percina rex | Endangered | Wherever found | 08-18-1989 |
| Robber Baron Cave Meshweaver | Cicurina baronia | Endangered | Wherever found | 12-26-2000 |
| Robust spineflower | Chorizanthe robusta var. robusta | Endangered | Wherever found | 02-04-1994 |
| Rock gnome lichen | Gymnoderma lineare | Endangered | Wherever found | 01-18-1995 |
| Rodrigues fody | Foudia flavicans | Endangered | Wherever found | 01-12-1995 |
| Rodrigues fruit bat (=flying fox) | Pteropus rodricensis | Endangered | Wherever found | 01-23-1984 |
| Rodrigues warbler (old world warbler) | Bebrornis rodericanus | Endangered | Wherever found | 06-02-1970 |
| Roseate tern | Sterna dougallii dougallii | Threatened | Western Hemisphere and adjacent oceans, incl. U.S.A. (FL, PR, VI), where not listed as endangered | 11-02-1987 |
| Roseate tern | Sterna dougallii dougallii | Endangered | U.S.A. (Atlantic Coast south to NC), Canada (Newf., N.S, Que.), Bermuda | 11-02-1987 |
| Roswell springsnail | Pyrgulopsis roswellensis | Endangered | Wherever found | 08-09-2005 |
| Rota blue damselfly | Ischnura luta | Endangered | Wherever found | 11-02-2015 |
| Rota bridled White-eye | Zosterops rotensis | Endangered | Wherever found | 01-22-2004 |
| Rothschild's starling (myna) | Leucopsar rothschildi | Endangered | Wherever found | 06-02-1970 |
| Rough Cactus Coral | Mycetophyllia ferox | Threatened | Wherever found | 11-13-2014 |
| Rough hornsnail | Pleurocera foremani | Endangered | Wherever found | 12-02-2010 |
| Rough-leaved loosestrife | Lysimachia asperulaefolia | Endangered | Wherever found | 06-12-1987 |
| Rough pigtoe | Pleurobema plenum | Experimental Population, Non-Essential | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 10-15-2007 |
| Rough pigtoe | Pleurobema plenum | Endangered | Wherever found | 06-14-1976 |
| rough popcornflower | Plagiobothrys hirtus | Endangered | Wherever found | 01-25-2000 |
| Rough rabbitsfoot | Quadrula cylindrica strigillata | Endangered | Wherever found | 01-10-1997 |
| Round Ebonyshell | Reginaia rotulata | Endangered | Wherever found | 10-10-2012 |
| Round hickorynut | Obovaria subrotunda | Threatened | Wherever found | 04-10-2023 |
| Round Island bolyeria boa | Bolyeria multocarinata | Endangered | Wherever found | 03-20-1980 |
| Round Island casarea boa | Casarea dussumieri | Endangered | Wherever found | 03-20-1980 |
| Round Island day gecko | Phelsuma guentheri | Endangered | Wherever found | 06-02-1970 |
| Round Island skink | Leiolopisma telfairi | Threatened | Wherever found | 06-22-1983 |
| Round-leaved chaff-flower | Achyranthes splendens var. rotundata | Endangered | Wherever found | 03-26-1986 |
| Round rocksnail | Leptoxis ampla | Threatened | Wherever found | 10-28-1998 |
| Royal cinclodes | Cinclodes aricomae | Endangered | Wherever found | 07-24-2012 |
| Royal marstonia (snail) | Marstonia ogmorhaphe | Endangered | Wherever found | 04-15-1994 |
| Roy Prairie pocket gopher | Thomomys mazama glacialis | Threatened | Wherever found | 05-09-2014 |
| Rugel's pawpaw | Deeringothamnus rugelii | Endangered | | 09-26-1986 |
| Rush Darter | Etheostoma phytophilum | Endangered | Wherever found | 09-08-2011 |
| Rusty patched bumble bee | Bombus affinis | Endangered | Wherever found | 03-21-2017 |
| Ruth's golden aster | Pityopsis ruthii | Endangered | Wherever found | 07-18-1985 |
| Ryukyu rabbit | Pentalagus furnessi | Endangered | Japan (Ryukyu Islands) | 07-27-1979 |
| Ryukyu sika deer | Cervus nippon keramae | Endangered | Wherever found | 07-27-1979 |
| Sacramento Mountains checkerspot Butterfly | Euphydryas anicia cloudcrofti | Endangered | Wherever found | 03-02-2023 |
| Sacramento Mountains thistle | Cirsium vinaceum | Threatened | Wherever found | 06-16-1987 |
| Sacramento Orcutt grass | Orcuttia viscida | Endangered | Wherever found | 03-26-1997 |
| Sacramento prickly poppy | Argemone pleiacantha ssp. pinnatisecta | Endangered | Wherever found | 08-24-1989 |
| Saimaa seal | Phoca hispida saimensis | Endangered | Wherever found | 05-06-1993 |
| Saint Francis' satyr butterfly | Neonympha mitchellii francisci | Endangered | Wherever found | 04-18-1994 |
| Sakhalin sturgeon | Acipenser mikadoi | Endangered | Wherever found | 09-04-2014 |
| Salado Salamander | Eurycea chisholmensis | Threatened | Wherever found | 03-26-2014 |
| Salmon-crested cockatoo | Cacatua moluccensis | Threatened | Wherever found | 06-27-2011 |
| Salt Creek Tiger beetle | Cicindela nevadica lincolniana | Endangered | Wherever found | 10-06-2005 |
| Salt marsh bird's-beak | Cordylanthus maritimus ssp. maritimus | Endangered | Wherever found | 10-29-1978 |
| Salt marsh harvest mouse | Reithrodontomys raviventris | Endangered | wherever found | 10-13-1970 |
| Saltwater crocodile | Crocodylus porosus | Threatened | Australia | 06-24-1996 |
| Saltwater crocodile | Crocodylus porosus | Endangered | Wherever found, except Papua New Guinea and Australia | 12-18-1979 |
| San Bernardino bluegrass | Poa atropurpurea | Endangered | Wherever found | 10-14-1998 |
| San Bernardino Merriam's kangaroo rat | Dipodomys merriami parvus | Endangered | Wherever found | 01-27-1998 |
| San Bernardino Mountains bladderpod | Lesquerella kingii ssp. bernardina | Endangered | Wherever found | 08-24-1994 |
| San Bernardino springsnail | Pyrgulopsis bernardina | Threatened | Wherever found | 05-17-2012 |
| San Bruno elfin butterfly | Callophrys mossii bayensis | Endangered | Wherever found | 06-08-1976 |
| San Clemente Island woodland-star | Lithophragma maximum | Endangered | Wherever found | 08-08-1997 |
| San Clemente loggerhead shrike | Lanius ludovicianus mearnsi | Endangered | Wherever found | 09-12-1977 |
| Sand flax | Linum arenicola | Endangered | | 10-31-2016 |
| Sand gazelle | Gazella subgutturosa marica | Endangered | Wherever found | 07-27-1979 |
| San Diego ambrosia | Ambrosia pumila | Endangered | Wherever found | 07-02-2002 |
| San Diego button-celery | Eryngium aristulatum var. parishii | Endangered | Wherever found | 08-03-1993 |
| San Diego fairy shrimp | Branchinecta sandiegonensis | Endangered | Wherever found | 02-03-1997 |
| San Diego mesa-mint | Pogogyne abramsii | Endangered | Wherever found | 10-29-1978 |
| San Diego thornmint | Acanthomintha ilicifolia | Threatened | Wherever found | 10-13-1998 |
| Sandlace | Polygonella myriophylla | Endangered | | 04-27-1993 |
| Sandplain gerardia | Agalinis acuta | Endangered | Wherever found | 09-07-1988 |
| Sand skink | Neoseps reynoldsi | Threatened | Wherever found | 11-06-1987 |
| San Esteban Island chuckwalla | Sauromalus varius | Endangered | Wherever found | 03-20-1980 |
| San Francisco garter snake | Thamnophis sirtalis tetrataenia | Endangered | Wherever found | 03-11-1967 |
| San Francisco lessingia | Lessingia germanorum (=L.g. var. germanorum) | Endangered | Wherever found | 06-19-1997 |
| San Francisco Peaks ragwort | Packera franciscana | Threatened | Wherever found | 11-22-1983 |
| San Jacinto Valley crownscale | Atriplex coronata var. notatior | Endangered | Wherever found | 10-13-1998 |
| San Joaquin adobe sunburst | Pseudobahia peirsonii | Threatened | Wherever found | 02-06-1997 |
| San Joaquin kit fox | Vulpes macrotis mutica | Endangered | wherever found | 03-11-1967 |
| San Joaquin Valley Orcutt grass | Orcuttia inaequalis | Threatened | Wherever found | 03-26-1997 |
| San Joaquin wooly-threads | Monolopia (=Lembertia) congdonii | Endangered | Wherever found | 07-19-1990 |
| San Marcos gambusia | Gambusia georgei | Endangered | Wherever found | 07-14-1980 |
| San Marcos salamander | Eurycea nana | Threatened | Wherever found | 07-14-1980 |
| San Mateo thornmint | Acanthomintha obovata ssp. duttonii | Endangered | Wherever found | 09-18-1985 |
| San Mateo woolly sunflower | Eriophyllum latilobum | Endangered | Wherever found | 02-03-1995 |
| San Rafael cactus | Pediocactus despainii | Endangered | Wherever found | 09-16-1987 |
| Santa Ana River woolly-star | Eriastrum densifolium ssp. sanctorum | Endangered | Wherever found | 09-28-1987 |
| Santa Ana sucker | Catostomus santaanae | Threatened | Los Angeles River basin, San Gabriel River basin, Santa Ana River basin | 04-12-2000 |
| Santa Barbara Island liveforever | Dudleya traskiae | Endangered | Wherever found | 05-27-1978 |
| Santa Catalina Island Fox | Urocyon littoralis catalinae | Threatened | Wherever found | 03-05-2004 |
| Santa Clara Valley dudleya | Dudleya setchellii | Endangered | Wherever found | 02-03-1995 |
| Santa Cruz cypress | Cupressus abramsiana | Threatened | Wherever found | 01-08-1987 |
| Santa Cruz Island bush-mallow | Malacothamnus fasciculatus var. nesioticus | Endangered | Wherever found | 07-31-1997 |
| Santa Cruz Island dudleya | Dudleya nesiotica | Threatened | Wherever found | 07-31-1997 |
| Santa Cruz Island fringepod | Thysanocarpus conchuliferus | Endangered | Wherever found | 07-31-1997 |
| Santa Cruz Island malacothrix | Malacothrix indecora | Endangered | Wherever found | 07-31-1997 |
| Santa Cruz Island rockcress | Sibara filifolia | Endangered | Wherever found | 08-08-1997 |
| Santa Cruz long-toed salamander | Ambystoma macrodactylum croceum | Endangered | Wherever found | 03-11-1967 |
| Santa Cruz tarplant | Holocarpha macradenia | Threatened | Wherever found | 03-20-2000 |
| Santa Monica Mountains dudleyea | Dudleya cymosa ssp. ovatifolia | Threatened | Wherever found | 01-29-1997 |
| Santa Rosa Island manzanita | Arctostaphylos confertiflora | Endangered | Wherever found | 07-31-1997 |
| Sao Miguel bullfinch (finch) | Pyrrhula pyrrhula murina | Endangered | Wherever found | 06-02-1970 |
| Saudi Arabian gazelle | Gazella dorcas saudiya | Endangered | Wherever found | 07-27-1979 |
| Sawback angelshark | Squatina aculeata | Endangered | | 03-31-2016 |
| Scaleshell mussel | Leptodea leptodon | Endangered | Wherever found | 10-09-2001 |
| Scalloped Hammerhead Shark | Sphyrna lewini | Threatened | Indo-West Pacific DPS | 09-02-2014 |
| Scalloped Hammerhead Shark | Sphyrna lewini | Endangered | Eastern Pacific DPS | 09-02-2014 |
| Scalloped Hammerhead Shark | Sphyrna lewini | Endangered | Eastern Atlantic DPS | 09-02-2014 |
| Scalloped Hammerhead Shark | Sphyrna lewini | Threatened | Central and Southwest Atlantic DPS | 09-02-2014 |
| Scaly-tailed possum | Wyulda squamicaudata | Endangered | Wherever found | 12-02-1970 |
| Scarlet-breasted robin (flycatcher) | Petroica multicolor multicolor | Endangered | Wherever found | 06-02-1970 |
| Scarlet macaw | Ara macao ssp. cyanopterus | Endangered | Wherever found | 03-28-2019 |
| Scarlet macaw | Ara macao ssp. macao | Similarity of Appearance (Threatened) | Southern DPS | 03-28-2019 |
| Scarlet macaw | Ara macao ssp. macao | Threatened | Northern DPS | 03-28-2019 |
| Schaus swallowtail butterfly | Heraclides aristodemus ponceanus | Endangered | Wherever found | 04-28-1976 |
| Schweinitz's sunflower | Helianthus schweinitzii | Endangered | Wherever found | 05-07-1991 |
| Scimitar-horned oryx | Oryx dammah | Endangered | Wherever found | 09-02-2005 |
| Scioto madtom | Noturus trautmani | Endangered | Wherever found | 10-28-1975 |
| Sclater's monal pheasant | Lophophorus sclateri | Endangered | Wherever found | 06-02-1970 |
| Scotts Valley Polygonum | Polygonum hickmanii | Endangered | Wherever found | 04-08-2003 |
| Scotts Valley spineflower | Chorizanthe robusta var. hartwegii | Endangered | Wherever found | 02-04-1994 |
| Scrub blazingstar | Liatris ohlingerae | Endangered | | 07-27-1989 |
| Scrub buckwheat | Eriogonum longifolium var. gnaphalifolium | Threatened | | 04-27-1993 |
| Scrub lupine | Lupinus aridorum | Endangered | | 04-07-1987 |
| Scrub mint | Dicerandra frutescens | Endangered | | 11-01-1985 |
| Scrub plum | Prunus geniculata | Endangered | | 01-21-1987 |
| Seabeach amaranth | Amaranthus pumilus | Threatened | Wherever found | 04-07-1993 |
| sea bean | Mucuna sloanei var. persericea | Endangered | Wherever found | 06-27-2013 |
| Sebastopol meadowfoam | Limnanthes vinculans | Endangered | Wherever found | 12-02-1991 |
| Sei whale | Balaenoptera borealis | Endangered | Wherever found | 06-02-1970 |
| Seledang | Bos gaurus | Endangered | Wherever found | 06-02-1970 |
| Semper's warbler (=wood) | Leucopeza semperi | Endangered | Wherever found | 06-02-1970 |
| Sensitive joint-vetch | Aeschynomene virginica | Threatened | Wherever found | 05-20-1992 |
| Sentry milk-vetch | Astragalus cremnophylax var. cremnophylax | Endangered | Wherever found | 12-05-1990 |
| Serow | Naemorhedus (=Capricornis) sumatraensis | Endangered | Wherever found | 06-14-1976 |
| Serpent Island gecko | Cyrtodactylus serpensinsula | Threatened | Wherever found | 06-22-1983 |
| Seychelles fody (weaver-finch) | Foudia sechellarum | Endangered | Wherever found | 06-02-1970 |
| Seychelles kestrel | Falco araea | Endangered | Wherever found | 06-02-1970 |
| Seychelles lesser vasa parrot | Coracopsis nigra barklyi | Endangered | Wherever found | 01-12-1995 |
| Seychelles magpie-robin (thrush) | Copsychus sechellarum | Endangered | Wherever found | 06-02-1970 |
| Seychelles paradise flycatcher | Terpsiphone corvina | Endangered | Wherever found | 06-02-1970 |
| Seychelles scops owl | Otus magicus (=insularis) insularis | Endangered | Wherever found | 06-02-1970 |
| Seychelles turtle dove | Streptopelia picturata rostrata | Endangered | Wherever found | 01-12-1995 |
| Seychelles warbler (old world warbler) | Bebrornis sechellensis | Endangered | Wherever found | 06-02-1970 |
| Seychelles white-eye | Zosterops modesta | Endangered | Wherever found | 06-02-1970 |
| Shale barren rock cress | Boechera serotina | Endangered | Wherever found | 07-13-1989 |
| Shansi sika deer | Cervus nippon grassianus | Endangered | Wherever found | 07-27-1979 |
| Shapo | Ovis vignei vignei | Endangered | Wherever found | 06-14-1976 |
| Shark Bay mouse | Pseudomys praeconis | Endangered | Wherever found | 12-02-1970 |
| Sharpnose Shiner | Notropis oxyrhynchus | Endangered | Wherever found | 08-04-2014 |
| Shasta crayfish | Pacifastacus fortis | Endangered | Wherever found | 09-30-1988 |
| Sheepnose Mussel | Plethobasus cyphyus | Endangered | Wherever found | 04-12-2012 |
| Shenandoah salamander | Plethodon shenandoah | Endangered | Wherever found | 08-18-1989 |
| Shiny pigtoe | Fusconaia cor | Endangered | Wherever found; Except where listed as Experimental Populations | 06-14-1976 |
| Shiny pigtoe | Fusconaia cor | Experimental Population, Non-Essential | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 10-15-2007 |
| Shiny pigtoe | Fusconaia cor | Experimental Population, Non-Essential | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 06-14-2001 |
| Shinyrayed pocketbook | Hamiota subangulata | Endangered | Wherever found | 03-16-1998 |
| Shivwits milk-vetch | Astragalus ampullarioides | Endangered | Wherever found | 09-28-2001 |
| Short-leaved rosemary | Conradina brevifolia | Endangered | | 07-12-1993 |
| Short-necked or western swamp turtle | Pseudemydura umbrina | Endangered | Wherever found | 06-02-1970 |
| Shortnose sturgeon | Acipenser brevirostrum | Endangered | Wherever found | 03-11-1967 |
| Shortnose Sucker | Chasmistes brevirostris | Endangered | Wherever found | 07-18-1988 |
| Shortridge's mouse | Pseudomys shortridgei | Endangered | Wherever found | 12-02-1970 |
| Short's bladderpod | Physaria globosa | Endangered | Wherever found | 08-01-2014 |
| Short's goldenrod | Solidago shortii | Endangered | Wherever found | 09-05-1985 |
| Short-tailed albatross | Phoebastria (=Diomedea) albatrus | Endangered | Wherever found | 06-02-1970 |
| Shou | Cervus elaphus wallichi | Endangered | Wherever found | 06-02-1970 |
| Shovelnose Sturgeon | Scaphirhynchus platorynchus | Similarity of Appearance (Threatened) | Wherever found | 10-01-2010 |
| Showy Indian clover | Trifolium amoenum | Endangered | Wherever found | 10-22-1997 |
| Showy stickseed | Hackelia venusta | Endangered | Wherever found | 02-06-2002 |
| Shrubby reed-mustard | Schoenocrambe suffrutescens | Endangered | Wherever found | 10-06-1987 |
| Siamang | Symphalangus syndactylus | Endangered | Wherever found | 06-14-1976 |
| Siamese crocodile | Crocodylus siamensis | Endangered | Wherever found | 06-14-1976 |
| Siberian white Crane | Grus leucogeranus | Endangered | Wherever found | 12-02-1970 |
| Sichuan snub-nosed monkey | Rhinopithecus roxellana | Endangered | Wherever found | 09-27-1990 |
| Sickle darter | Percina williamsi | Threatened | Wherever found | 12-07-2022 |
| Sierra Nevada bighorn sheep | Ovis canadensis sierrae | Endangered | U.S.A. (CA) Sierra Nevada | 04-20-1999 |
| Sierra Nevada red fox | Vulpes vulpes necator | Endangered | Sierra Nevada DPS | 09-02-2021 |
| Sierra Nevada Yellow-legged Frog | Rana sierrae | Endangered | Wherever found | 06-30-2014 |
| Sifakas | Propithecus spp. | Endangered | Wherever found | 12-02-1970 |
| Siler pincushion cactus | Pediocactus (=Echinocactus,=Utahia) sileri | Threatened | Wherever found | 11-26-1979 |
| Silver rice rat | Oryzomys palustris natator | Endangered | Lower FL Keys (west of Seven Mile Bridge) | 04-30-1991 |
| Simien fox | Canis simensis | Endangered | Wherever found | 07-27-1979 |
| Sinaloan jaguarundi | Puma yagouaroundi tolteca | Endangered | Wherever found | 06-14-1976 |
| Singapore roundleaf horseshoe bat | Hipposideros ridleyi | Endangered | Wherever found | 01-23-1984 |
| Slabside Pearlymussel | Pleuronaia dolabelloides | Endangered | Wherever found | 10-28-2013 |
| Slackwater darter | Etheostoma boschungi | Threatened | Wherever found | 10-11-1977 |
| Slender-billed curlew | Numenius tenuirostris | Endangered | Wherever found | 09-12-2011 |
| Slender-billed Grackle | Quisicalus palustris | Endangered | Wherever found | 06-02-1970 |
| Slender campeloma | Campeloma decampi | Endangered | Wherever found | 02-25-2000 |
| Slender chub | Erimystax cahni | Threatened | Wherever found | 10-11-1977 |
| Slender chub | Erimystax cahni | Experimental Population, Non-Essential | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.84(s)(1)(i)) | 10-15-2007 |
| Slenderclaw crayfish | Cambarus cracens | Endangered | Wherever found | 10-15-2021 |
| Slender-horned gazelle | Gazella leptoceros | Endangered | Wherever found | 06-02-1970 |
| Slender-horned spineflower | Dodecahema leptoceras | Endangered | Wherever found | 09-28-1987 |
| Slender Orcutt grass | Orcuttia tenuis | Threatened | Wherever found | 03-26-1997 |
| Slender-petaled mustard | Thelypodium stenopetalum | Endangered | Wherever found | 08-31-1984 |
| Slender rush-pea | Hoffmannseggia tenella | Endangered | Wherever found | 11-01-1985 |
| Slevin's skink | Emoia slevini | Endangered | Wherever found | 11-02-2015 |
| Slickspot peppergrass | Lepidium papilliferum | Threatened | | 09-16-2016 |
| Small-anthered bittercress | Cardamine micranthera | Endangered | Wherever found | 09-21-1989 |
| Smalleye Shiner | Notropis buccula | Endangered | Wherever found | 08-04-2014 |
| Small Kauai (=puaiohi) Thrush | Myadestes palmeri | Endangered | Wherever found | 03-11-1967 |
| Small's milkpea | Galactia smallii | Endangered | | 07-18-1985 |
| Smalltooth sawfish | Pristis pectinata | Endangered | Non-US DPS - Smalltooth sawfish originating from non-US waters | 01-12-2015 |
| Smalltooth sawfish | Pristis pectinata | Endangered | US DPS - Smalltooth sawfish originating from U.S. waters. | 11-16-2005 |
| Small whorled pogonia | Isotria medeoloides | Threatened | | 09-09-1982 |
| Smith's blue butterfly | Euphilotes enoptes smithi | Endangered | Wherever found | 06-08-1976 |
| Smoky madtom | Noturus baileyi | Endangered | Wherever found | 10-26-1984 |
| Smoky madtom | Noturus baileyi | Experimental Population, Non-Essential | The Tellico River, between the backwaters of the Tellico Reservoir (approximately Tellico River mile 19 (30.4 kilometers) and Tellico River mile 33 (52.8 kilometers), near the Tellico Ranger Station, Monroe County, Tennessee. | 08-12-2002 |
| Smoky mouse | Pseudomys fumeus | Endangered | Wherever found | 12-02-1970 |
| Smoothback angelshark | Squatina oculata | Endangered | | 08-31-2016 |
| Smooth coneflower | Echinacea laevigata | Threatened | Wherever found | 10-08-1992 |
| Snail [no common name] | Eua zebrina | Endangered | Wherever found | 10-24-2016 |
| Snail [no common name] | Ostodes strigatus | Endangered | Wherever found | 10-24-2016 |
| Snake River physa snail | Physella natricina | Endangered | Wherever found | 12-14-1992 |
| Snakeroot | Eryngium cuneifolium | Endangered | | 01-21-1987 |
| Sneed pincushion cactus | Coryphantha sneedii var. sneedii | Endangered | Wherever found | 12-07-1979 |
| Snow leopard | Uncia (=Panthera) uncia | Endangered | Wherever found | 03-28-1972 |
| Snuffbox mussel | Epioblasma triquetra | Endangered | Wherever found | 03-15-2012 |
| Sockeye salmon | Oncorhynchus (=Salmo) nerka | Threatened | Ozette Lake ESU - See 50 CFR 223.102 | 03-25-1999 |
| Sockeye salmon | Oncorhynchus (=Salmo) nerka | Endangered | Snake River ESU - See 50 CFR 224.101 | 01-03-1992 |
| Socorro isopod | Thermosphaeroma thermophilus | Endangered | Wherever found | 04-26-1978 |
| Socorro mockingbird | Mimus graysoni | Endangered | Wherever found | 01-16-2008 |
| Socorro springsnail | Pyrgulopsis neomexicana | Endangered | Wherever found | 09-30-1991 |
| Soft bird's-beak | Cordylanthus mollis ssp. mollis | Endangered | Wherever found | 11-20-1997 |
| Soft-leaved paintbrush | Castilleja mollis | Endangered | Wherever found | 07-31-1997 |
| Solano grass | Tuctoria mucronata | Endangered | Wherever found | 09-29-1978 |
| Solitary tinamou | Tinamus solitarius | Endangered | Wherever found | 06-14-1976 |
| Sonoma alopecurus | Alopecurus aequalis var. sonomensis | Endangered | Wherever found | 10-22-1997 |
| Sonoma spineflower | Chorizanthe valida | Endangered | Wherever found | 06-22-1992 |
| Sonoma sunshine | Blennosperma bakeri | Endangered | Wherever found | 12-02-1991 |
| Sonora chub | Gila ditaenia | Threatened | Wherever found | 04-30-1986 |
| Sonoran pronghorn | Antilocapra americana sonoriensis | Experimental Population, Non-Essential | In Arizona, an area north of Interstate 8 and south of Interstate 10, bounded by the Colorado River on the west and Interstate 10 on the east; and an area south of Interstate 8, bounded by Highway 85 on the west, Interstates 10 and 19 on the east, and the U.S.-Mexico border on the south | 05-05-2011 |
| Sonoran pronghorn | Antilocapra americana sonoriensis | Endangered | Wherever found, except where listed as an experimental population | 03-11-1967 |
| Sonoran tiger salamander | Ambystoma mavortium stebbinsi | Endangered | Wherever found | 01-06-1997 |
| Sonoyta mud turtle | Kinosternon sonoriense longifemorale | Endangered | Wherever found | 10-20-2017 |
| South American (=Brazilian) tapir | Tapirus terrestris | Endangered | Wherever found | 06-02-1970 |
| South American red-lined turtle | Trachemys scripta callirostris | Endangered | Wherever found | 09-30-1991 |
| South Andean huemul | Hippocamelus bisulcus | Endangered | Wherever found | 06-14-1976 |
| South Asian River dolphin | Platanista gangetica minor | Endangered | Wherever found | 01-14-1991 |
| South China sika deer | Cervus nippon kopschi | Endangered | Wherever found | 07-27-1979 |
| Southeastern beach mouse | Peromyscus polionotus niveiventris | Threatened | wherever found | 05-12-1989 |
| Southeastern rufous-vented ground cuckoo | Neomorphus geoffroyi dulcis | Endangered | Wherever found | 01-27-2011 |
| Southern acornshell | Epioblasma othcaloogensis | Endangered | Wherever found | 03-17-1993 |
| Southern bearded saki | Chiropotes satanas satanas | Endangered | Wherever found | 05-16-1986 |
| Southern clubshell | Pleurobema decisum | Endangered | Wherever found | 03-17-1993 |
| Southern combshell | Epioblasma penita | Endangered | Wherever found | 04-07-1987 |
| Southern kidneyshell | Ptychobranchus jonesi | Endangered | Wherever found | 10-10-2012 |
| Southern Mountain Caribou DPS | Rangifer tarandus ssp. caribou | Endangered | U.S.A. (wherever found), Canada (southeastern British Columbia) | 01-14-1983 |
| Southern mountain wild-buckwheat | Eriogonum kennedyi var. austromontanum | Threatened | Wherever found | 10-14-1998 |
| Southern pigtoe | Pleurobema georgianum | Endangered | Wherever found | 03-17-1993 |
| Southern planigale | Planigale tenuirostris | Endangered | Wherever found | 12-02-1970 |
| Southern Right Whale | Eubalaena australis | Endangered | Wherever found | 06-02-1970 |
| Southern river otter | Lontra (=Lutra) provocax | Endangered | Wherever found | 06-14-1976 |
| southern rockhopper penguin | Eudyptes chrysocome | Threatened | New Zealand-Australia DPS, associated with the Campbell Plateau and Macquarie Island | 03-24-2011 |
| Southern Sandshell | Hamiota australis | Threatened | Wherever found | 10-10-2012 |
| Southern sea otter | Enhydra lutris nereis | Threatened | Wherever found | 01-14-1977 |
| Southern white rhinoceros | Ceratotherium simum ssp. simum | Similarity of Appearance (Threatened) | Wherever found | 09-11-2013 |
| South Island Hector's dolphin | Cephalorhynchus hectori hectori | Threatened | | 10-19-2017 |
| South Llano Springs moss | Donrichardsia macroneuron | Endangered | Wherever found | 05-30-2023 |
| South Texas ambrosia | Ambrosia cheiranthifolia | Endangered | Wherever found | 08-24-1994 |
| Southwestern willow flycatcher | Empidonax traillii extimus | Endangered | Wherever found | 02-27-1995 |
| Spalding's Catchfly | Silene spaldingii | Threatened | Wherever found | 10-10-2001 |
| Spanish imperial eagle | Aquila heliaca adalberti | Endangered | Wherever found | 06-02-1970 |
| Spanish lynx | Felis pardina | Endangered | Wherever found | 06-02-1970 |
| Speckled pocketbook | Lampsilis streckeri | Endangered | Wherever found | 02-28-1989 |
| Spectaclecase (mussel) | Cumberlandia monodonta | Endangered | Wherever found | 04-12-2012 |
| Spectacled eider | Somateria fischeri | Threatened | Wherever found | 05-10-1993 |
| Sperm whale | Physeter catodon (=macrocephalus) | Endangered | Wherever found | 06-02-1970 |
| Spider monkey | Ateles geoffroyi frontatus | Endangered | Wherever found | 06-02-1970 |
| Spider monkey | Ateles geoffroyl panamensis | Endangered | Wherever found | 06-02-1970 |
| Spikedace | Meda fulgida | Endangered | Wherever found | 07-01-1986 |
| Spiny angelshark | Squatina guggenheim | Endangered | | |
| Spotfin Chub | Erimonax monachus | Threatened | Wherever found, except where listed as an experimental population | 10-11-1977 |
| Spotfin Chub | Erimonax monachus | Experimental Population, Non-Essential | U.S.A. (TN-specified portions of the Tellico River; see 17.84(m)(1)(i)) | 08-12-2002 |
| Spotfin Chub | Erimonax monachus | Experimental Population, Non-Essential | U.S.A. (TN-specified portions of the French Broad and Holston Rivers; see 17.84(m)(1)(iii)) | 10-15-2007 |
| Spotfin Chub | Erimonax monachus | Experimental Population, Non-Essential | U.S.A. (AL, TN-specified portions of Shoal Creek; see 17.84(m)(1)(ii)) | 04-08-2005 |
| Spotted linsang | Prionodon pardicolor | Endangered | Wherever found | 06-14-1976 |
| Spotted pond turtle | Geoclemys hamiltonii | Endangered | Wherever found | 06-14-1976 |
| Spotted Seal | Phoca largha | Threatened | Southern DPS - See 50 CFR 223.102 | 04-13-2011 |
| Spreading avens | Geum radiatum | Endangered | Wherever found | 04-05-1990 |
| Spreading navarretia | Navarretia fossalis | Threatened | Wherever found | 10-13-1998 |
| Spring Creek bladderpod | Lesquerella perforata | Endangered | Wherever found | 12-23-1996 |
| Spring-loving centaury | Centaurium namophilum | Threatened | Wherever found | 05-20-1985 |
| Spring pygmy sunfish | Elassoma alabamae | Threatened | Wherever found | 12-02-2013 |
| Springville clarkia | Clarkia springvillensis | Threatened | Wherever found | 10-14-1998 |
| Spruce-fir moss spider | Microhexura montivaga | Endangered | Wherever found | 02-06-1995 |
| Squirrel Chimney Cave shrimp | Palaemonetes cummingi | Threatened | Wherever found | 06-21-1990 |
| Sri Lankan Ornamental Tarantula | Poecilotheria fasciata | Endangered | Wherever found | 08-30-2018 |
| Staghorn coral | Acropora cervicornis | Threatened | Wherever found | 06-08-2006 |
| St. Andrew beach mouse | Peromyscus polionotus peninsularis | Endangered | Wherever found | 12-18-1998 |
| Star cactus | Astrophytum asterias | Endangered | Wherever found | 10-18-1993 |
| St. Croix ground lizard | Ameiva polops | Endangered | Wherever found | 07-05-1977 |
| Steamboat buckwheat | Eriogonum ovalifolium var. williamsiae | Endangered | Wherever found | 07-08-1986 |
| Stebbins' morning-glory | Calystegia stebbinsii | Endangered | Wherever found | 10-18-1996 |
| Steelhead | Oncorhynchus (=Salmo) mykiss | Threatened | Central California Coast DPS - See 50 CFR 223.102 | 06-17-1998 |
| Steelhead | Oncorhynchus (=Salmo) mykiss | Threatened | California Central Valley DPS - See 50 CFR 223.102 | 06-17-1998 |
| Steelhead | Oncorhynchus (=Salmo) mykiss | Threatened | Middle Columbia River DPS - See 50 CFR 223.102 | 08-02-1999 |
| Steelhead | Oncorhynchus (=Salmo) mykiss | Threatened | Lower Columbia River DPS - See 50 CFR 223.102 | 06-17-1998 |
| Steelhead | Oncorhynchus (=Salmo) mykiss | Endangered | Southern California DPS - See 50 CFR 224.101 | 06-17-1998 |
| Steelhead | Oncorhynchus (=Salmo) mykiss | Threatened | Upper Columbia River DPS - See 50 CFR 223.102 | 06-17-1998 |
| Steelhead | Oncorhynchus (=Salmo) mykiss | Threatened | Northern California DPS - See 50 CFR 223.102 | 08-07-2000 |
| Steelhead | Oncorhynchus (=Salmo) mykiss | Threatened | Upper Willamette River DPS - See 50 CFR 223.102 | 08-02-1999 |
| Steelhead | Oncorhynchus (=Salmo) mykiss | Threatened | Puget Sound DPS - See 50 CFR 223.102 | 05-07-2007 |
| Steelhead | Oncorhynchus (=Salmo) mykiss | Threatened | South-Central California Coast DPS - See 50 CFR 223.102 | 06-17-1998 |
| Steelhead | Oncorhynchus (=Salmo) mykiss | Experimental Population, Non-Essential | Middle Columbia River DPS - XN - See 50 CFR 223.102 | 01-15-2013 |
| Steelhead | Oncorhynchus (=Salmo) mykiss | Threatened | Snake River Basin DPS - See 50 CFR 223.102 | 06-17-1998 |
| Steller sea lion | Eumetopias jubatus | Endangered | Western DPS - See 50 CFR 224.101 | 04-10-1990 |
| Steller's Eider | Polysticta stelleri | Threatened | U.S. Alaska breeding population only | 06-11-1997 |
| Stephen Island frog | Leiopelma hamiltoni | Endangered | Wherever found | 06-02-1970 |
| Stephens' kangaroo rat | Dipodomys stephensi (incl. D. cascus) | Threatened | Wherever found | 09-30-1988 |
| St. Francis River Crayfish | Faxonius quadruncus | Threatened | | 05-30-2023 |
| Stick-nest rat | Leporillus conditor | Endangered | Wherever found | 06-04-1973 |
| Stirrupshell | Quadrula stapes | Endangered | Wherever found | 04-07-1987 |
| St. Lucia Forest thrush | Cichlherminia iherminieri santaeluciae | Endangered | Wherever found | 09-16-2010 |
| St. Lucia house wren | Troglodytes aedon mesoleucus | Endangered | Wherever found | 06-02-1970 |
| St. Lucia parrot | Amazona versicolor | Endangered | Wherever found | 06-02-1970 |
| Stock Island tree snail | Orthalicus reses (not incl. nesodryas) | Threatened | Wherever found | 08-02-1978 |
| Straight-horned markhor | Capra falconeri megaceros | Threatened | Wherever found | 10-07-2014 |
| Streaked Horned lark | Eremophila alpestris strigata | Threatened | Wherever found | 11-04-2013 |
| Striped smoothhound shark | Mustelus fasciatus | Endangered | | |
| St. Thomas prickly-ash | Zanthoxylum thomasianum | Endangered | Wherever found | 12-20-1985 |
| Stump-tailed macaque | Macaca arctoides | Threatened | Wherever found | 10-19-1976 |
| St Vincent parrot | Amazona guildingii | Endangered | Wherever found | 06-02-1970 |
| Suisun thistle | Cirsium hydrophilum var. hydrophilum | Endangered | Wherever found | 11-20-1997 |
| Sumatran rhinoceros | Dicerorhinus sumatrensis | Endangered | Wherever found | 06-02-1970 |
| Suwannee moccasinshell | Medionidus walkeri | Threatened | Wherever found | 11-07-2016 |
| Swamp deer | Cervus duvauceli | Endangered | Wherever found | 06-02-1970 |
| Swamp pink | Helonias bullata | Threatened | | 10-11-1988 |
| Swayne's hartebeest | Alcelaphus buselaphus swaynei | Endangered | Wherever found | 07-27-1979 |
| Swinhoe's pheasant | Lophura swinhoii | Endangered | Wherever found | 06-02-1970 |
| Tahiti flycatcher | Pomarea nigra | Endangered | Wherever found | 06-02-1970 |
| Taita thrush | Turdus olivaceus helleri | Endangered | Wherever found | 01-12-1995 |
| Tamaraw | Bubalus mindorensis | Endangered | Wherever found | 12-02-1970 |
| Tampico pearlymussel | Cyrtonaias tampicoensis tecomatensis | Endangered | Wherever found | 06-14-1976 |
| Tana River mangabey | Cercocebus galeritus galeritus | Endangered | Wherever found | 06-02-1970 |
| Tana River red colobus monkey | Procolobus (=Colobus) rufomitratus (=badius r.) | Endangered | Wherever found | 06-02-1970 |
| Tan riffleshell | Epioblasma florentina walkeri (=E. walkeri) | Endangered | Wherever found | 09-26-1977 |
| Tapered pigtoe | Fusconaia burkei | Threatened | Wherever found | 10-10-2012 |
| Tar River spinymussel | Parvaspina steinstansana | Endangered | Wherever found | 06-27-1985 |
| Tartaruga | Podocnemis expansa | Endangered | Wherever found | 06-02-1970 |
| Tasmanian forester kangaroo | Macropus giganteus tasmaniensis | Endangered | Wherever found | 06-04-1973 |
| Tasmanian tiger | Thylacinus cynocephalus | Endangered | Wherever found | 06-02-1970 |
| Taylor's (=whulge) Checkerspot | Euphydryas editha taylori | Endangered | Wherever found | 11-04-2013 |
| Telephus spurge | Euphorbia telephioides | Threatened | | 05-08-1992 |
| Temnick''s ground Pangolin | Manis temminckii | Endangered | Wherever found | 06-14-1976 |
| Tenino pocket gopher | Thomomys mazama tumuli | Threatened | Wherever found | 05-09-2014 |
| Tennessee yellow-eyed grass | Xyris tennesseensis | Endangered | Wherever found | 07-26-1991 |
| Terlingua Creek cat's-eye | Cryptantha crassipes | Endangered | Wherever found | 09-30-1991 |
| Texas ayenia | Ayenia limitaris | Endangered | Wherever found | 08-24-1994 |
| Texas blind salamander | Eurycea rathbuni | Endangered | Wherever found | 03-11-1967 |
| Texas golden Gladecress | Leavenworthia texana | Endangered | Wherever found | 10-11-2013 |
| Texas Hornshell | Popenaias popeii | Endangered | Wherever found | 03-12-2018 |
| Texas poppy-mallow | Callirhoe scabriuscula | Endangered | Wherever found | 01-13-1981 |
| Texas prairie dawn-flower | Hymenoxys texana | Endangered | Wherever found | 03-13-1986 |
| Texas snowbells | Styrax platanifolius ssp. texanus | Endangered | Wherever found | 10-12-1984 |
| Texas trailing phlox | Phlox nivalis ssp. texensis | Endangered | Wherever found | 09-30-1991 |
| Texas wild-rice | Zizania texana | Endangered | Wherever found | 05-27-1978 |
| Thailand giant catfish | Pangasianodon gigas | Endangered | Wherever found | 06-02-1970 |
| Thick-billed parrot | Rhynchopsitta pachyrhyncha | Endangered | Wherever found | 06-02-1970 |
| Thin-spined porcupine | Chaetomys subspinosus | Endangered | Wherever found | 06-02-1970 |
| Thread-leaved brodiaea | Brodiaea filifolia | Threatened | Wherever found | 10-13-1998 |
| Three Forks Springsnail | Pyrgulopsis trivialis | Endangered | Wherever found | 05-17-2012 |
| Three-keeled Asian turtle | Melanochelys tricarinata | Endangered | Wherever found | 06-14-1976 |
| Thyolo alethe | Alethe choloensis | Endangered | Wherever found | 01-12-1995 |
| Tibetan antelope | Panthalops hodgsonii | Endangered | Wherever found | 03-29-2006 |
| Tiburon jewelflower | Streptanthus niger | Endangered | Wherever found | 02-03-1995 |
| Tiburon mariposa lily | Calochortus tiburonensis | Threatened | Wherever found | 02-03-1995 |
| Tiburon paintbrush | Castilleja affinis ssp. neglecta | Endangered | Wherever found | 02-03-1995 |
| Tidewater goby | Eucyclogobius newberryi | Endangered | Wherever found | 02-04-1994 |
| Tiehm's buckwheat | Eriogonum tiehmii | Endangered | | 01-17-2023 |
| Tiger | Panthera tigris | Endangered | Wherever found | 06-02-1970 |
| Tiger cat | Leopardus (=Felis) tigrinus | Endangered | Wherever found | 03-28-1972 |
| Tiny polygala | Polygala smallii | Endangered | | 07-18-1985 |
| Tipton kangaroo rat | Dipodomys nitratoides nitratoides | Endangered | Wherever found | 07-08-1988 |
| Tobusch fishhook cactus | Sclerocactus brevihamatus ssp. tobuschii | Threatened | Wherever found | 12-08-1979 |
| Todsen's pennyroyal | Hedeoma todsenii | Endangered | Wherever found | 01-19-1981 |
| Tomistoma | Tomistoma schlegelii | Endangered | Wherever found | 06-14-1976 |
| Tonkin snub-nosed monkey | Rhinopithecus avunculus | Endangered | Wherever found | 10-19-1976 |
| Tooth Cave ground beetle | Rhadine persephone | Endangered | Wherever found | 09-16-1988 |
| Tooth Cave pseudoscorpion | Tartarocreagris texana | Endangered | Wherever found | 09-16-1988 |
| Tooth Cave spider | Tayshaneta myopica | Endangered | Wherever found | 09-16-1988 |
| Topeka shiner | Notropis topeka (=tristis) | Endangered | Wherever found, except where listed as an experimental population | 12-15-1998 |
| Topeka shiner | Notropis topeka (=tristis) | Experimental Population, Non-Essential | U.S.A. (MO-specified portions of Little Creek, Big Muddy Creek, and Spring Creek watersheds in Adair, Gentry, Harrison, Putnam, Sullivan, and Worth Counties; see 17.84(d)(1)(i)) | 07-17-2013 |
| Toque macaque | Macaca sinica | Threatened | Wherever found | 10-19-1976 |
| Tora hartebeest | Alcelaphus buselaphus tora | Endangered | Wherever found | 07-27-1979 |
| Totoaba (seatrout or weakfish) | Cynoscion macdonaldi | Endangered | Wherever found | 05-21-1979 |
| Tracaja | Podocnemis unifilis | Endangered | Wherever found | 06-02-1970 |
| Triangular Kidneyshell | Ptychobranchus greenii | Endangered | Wherever found | 03-17-1993 |
| Trinidad white-headed curassow | Pipile pipile pipile | Endangered | Wherever found | 06-02-1970 |
| Triple-ribbed milk-vetch | Astragalus tricarinatus | Endangered | Wherever found | 10-06-1998 |
| Trispot darter | Etheostoma trisella | Threatened | Wherever found | 01-28-2019 |
| Tristam's woodpecker | Dryocopus javensis richardsi | Endangered | Wherever found | 06-02-1970 |
| Tuatara | Sphenodon punctatus | Endangered | Wherever found | 06-02-1970 |
| Tubercled blossom (pearlymussel) | Epioblasma torulosa torulosa | Endangered | Wherever found; Except where listed as Experimental Populations | 06-14-1976 |
| Tubercled blossom (pearlymussel) | Epioblasma torulosa torulosa | Experimental Population, Non-Essential | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 06-14-2001 |
| Tulotoma snail | Tulotoma magnifica | Threatened | Wherever found | 01-09-1991 |
| Tumbling Creek cavesnail | Antrobia culveri | Endangered | Wherever found | 08-14-2002 |
| Turgid blossom (pearlymussel) | Epioblasma turgidula | Endangered | Wherever found; Except where listed as Experimental Populations | 06-14-1976 |
| Turgid blossom (pearlymussel) | Epioblasma turgidula | Experimental Population, Non-Essential | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 06-14-2001 |
| Turks and Caicos iguana | Cyclura carinata carinata | Threatened | Wherever found | 06-22-1983 |
| Uakari (all species) | Cacajao spp. | Endangered | Wherever found | 06-02-1970 |
| Ufa-halomtano | Heritiera longipetiolata | Endangered | Wherever found | 11-02-2015 |
| Uhi uhi | Mezoneuron kavaiense | Endangered | Wherever found | 07-08-1986 |
| Uinta Basin hookless cactus | Sclerocactus wetlandicus | Threatened | Wherever found | 09-15-2009 |
| Ulugura bush-shrike | Malaconotus alius | Threatened | Wherever found | 01-12-1995 |
| Umtanum desert buckwheat | Eriogonum codium | Threatened | Wherever found | 05-23-2013 |
| Unarmored threespine stickleback | Gasterosteus aculeatus williamsoni | Endangered | Wherever found | 10-13-1970 |
| Uncompahgre fritillary butterfly | Boloria acrocnema | Endangered | Wherever found | 06-24-1991 |
| Upland combshell | Epioblasma metastriata | Endangered | Wherever found | 03-17-1993 |
| Urial | Ovis musimon ophion | Endangered | Wherever found | 06-14-1976 |
| Utah prairie dog | Cynomys parvidens | Threatened | Wherever found | 06-04-1973 |
| Ute ladies'-tresses | Spiranthes diluvialis | Threatened | Wherever found | 01-17-1992 |
| Uvillo | Eugenia haematocarpa | Endangered | Wherever found | 11-25-1994 |
| Vahl's boxwood | Buxus vahlii | Endangered | Wherever found | 08-13-1985 |
| Vail Lake ceanothus | Ceanothus ophiochilus | Threatened | Wherever found | 10-13-1998 |
| Valley elderberry longhorn beetle | Desmocerus californicus dimorphus | Threatened | Wherever found | 08-08-1980 |
| Vancouver Island marmot | Marmota vancouverensis | Endangered | Wherever found | 01-23-1984 |
| Van Dam's vanga | Xenopirostris damii | Threatened | Wherever found | 01-12-1995 |
| Vandenberg monkeyflower | Diplacus vandenbergensis | Endangered | Wherever found | 09-25-2014 |
| Ventura Marsh Milk-vetch | Astragalus pycnostachyus var. lanosissimus | Endangered | Wherever found | 05-21-2001 |
| Verity's dudleya | Dudleya verityi | Threatened | Wherever found | 01-29-1997 |
| Vermilion darter | Etheostoma chermocki | Endangered | Wherever found | 11-28-2001 |
| Vernal pool fairy shrimp | Branchinecta lynchi | Threatened | Wherever found | 09-19-1994 |
| Vernal pool tadpole shrimp | Lepidurus packardi | Endangered | Wherever found | 09-19-1994 |
| Vicuna | Vicugna vicugna | Endangered | Ecuador (DPS) | 06-02-1970 |
| Vicuna | Vicugna vicugna | Threatened | Entire, except Ecuador | 07-01-2002 |
| Vinaceous-breasted parrot | Amazona vinacea | Endangered | Wherever found | 06-14-1976 |
| Vine Hill clarkia | Clarkia imbricata | Endangered | Wherever found | 10-22-1997 |
| Virginia big-eared bat | Corynorhinus (=Plecotus) townsendii virginianus | Endangered | Wherever found | 12-31-1979 |
| Virginia fringed mountain snail | Polygyriscus virginianus | Endangered | Wherever found | 08-02-1978 |
| Virginia round-leaf birch | Betula uber | Threatened | Wherever found | 05-27-1978 |
| Virginia sneezeweed | Helenium virginicum | Threatened | Wherever found | 11-03-1998 |
| Virginia spiraea | Spiraea virginiana | Threatened | Wherever found | 06-15-1990 |
| Virgin Islands tree boa | Chilabothrus granti | Endangered | Wherever found | 10-13-1970 |
| Virgin River Chub | Gila seminuda (=robusta) | Endangered | Wherever found | 08-24-1989 |
| Visayan deer | Cervus alfredi | Endangered | Wherever found | 09-01-1988 |
| Volcano rabbit | Romerolagus diazi | Endangered | Mexico | 06-02-1970 |
| Waccamaw silverside | Menidia extensa | Threatened | Wherever found | 04-08-1987 |
| wahine noho Kula | Isodendrion pyrifolium | Endangered | Wherever found | 03-04-1994 |
| Walia ibex | Capra walie | Endangered | Wherever found | 06-02-1970 |
| Walker's manioc | Manihot walkerae | Endangered | Wherever found | 10-02-1991 |
| Warm Springs pupfish | Cyprinodon nevadensis pectoralis | Endangered | Wherever found | 10-13-1970 |
| Warner sucker | Catostomus warnerensis | Threatened | Wherever found | 09-27-1985 |
| Watercress darter | Etheostoma nuchale | Endangered | Wherever found | 10-13-1970 |
| Watling Island ground iguana | Cyclura rileyi rileyi | Endangered | Wherever found | 06-22-1983 |
| Wawae`iole | Huperzia mannii | Endangered | Wherever found | 05-15-1992 |
| Wawae`iole | Huperzia nutans | Endangered | Wherever found | 03-28-1994 |
| Webber's ivesia | Ivesia webberi | Threatened | Wherever found | 07-03-2014 |
| Wedge spurge | Chamaesyce deltoidea serpyllum | Endangered | | 10-31-2016 |
| Welsh's milkweed | Asclepias welshii | Threatened | Wherever found | 10-28-1987 |
| Wenatchee Mountains checkermallow | Sidalcea oregana var. calva | Endangered | Wherever found | 12-22-1999 |
| West African manatee | Trichechus senegalensis | Threatened | Wherever found | 10-16-1979 |
| West African ostrich | Struthio camelus spatzi | Endangered | Wherever found | 06-02-1970 |
| Western bristlebird | Dasyornis longirostris (=brachypterus I.) | Endangered | Wherever found | 06-02-1970 |
| Western giant eland | Taurotragus derbianus derbianus | Endangered | Wherever found | 07-27-1979 |
| Western glacier stonefly | Zapada glacier | Threatened | Wherever found | 12-23-2019 |
| Western hare wallaby | Lagorchestes hirsutus | Endangered | Wherever found | 12-02-1970 |
| Western lily | Lilium occidentale | Endangered | Wherever found | 08-17-1994 |
| Western mouse | Pseudomys occidentalis | Endangered | Wherever found | 12-02-1970 |
| Western prairie fringed Orchid | Platanthera praeclara | Threatened | Wherever found | 09-28-1989 |
| Western rufous bristlebird | Dasyornis broadbenti littoralis | Endangered | Wherever found | 06-14-1976 |
| Western snowy plover | Charadrius nivosus nivosus | Threatened | Pacific Coast population DPS-U.S.A. (CA, OR, WA), Mexico (within 50 miles of Pacific coast) | 03-05-1993 |
| Western tragopan pheasant | Tragopan melanocephalus | Endangered | Wherever found | 06-02-1970 |
| Western whipbird | Psophodes nigrogularis | Endangered | Wherever found | 06-02-1970 |
| West Indian Manatee | Trichechus manatus | Threatened | Wherever found | 03-11-1967 |
| West Indian Walnut (=Nogal) | Juglans jamaicensis | Endangered | Wherever found | 01-13-1997 |
| Wheeler's peperomia | Peperomia wheeleri | Endangered | Wherever found | 01-14-1987 |
| White Abalone | Haliotis sorenseni | Endangered | North America (West Coast from Point Conception, CA, U.S.A., to Punta Abreojos, Baja California, Mexico) | 11-16-2005 |
| Whitebark pine | Pinus albicaulis | Threatened | Wherever found | 01-17-2023 |
| White birds-in-a-nest | Macbridea alba | Threatened | | 05-08-1992 |
| White bladderpod | Physaria pallida | Endangered | Wherever found | 03-11-1987 |
| White Bluffs bladderpod | Physaria douglasii ssp. tuplashensis | Threatened | Wherever found | 05-23-2013 |
| White-breasted guineafowl | Agelastes meleagrides | Threatened | Wherever found | 01-12-1995 |
| White-breasted thrasher | Ramphocinclus brachyurus | Endangered | Wherever found | 06-02-1970 |
| White-browed tit-spinetail | Leptasthenura xenothorax | Endangered | Wherever found | 07-24-2012 |
| White catspaw (pearlymussel) | Epioblasma perobliqua | Endangered | Wherever found | 06-14-1976 |
| White Cay ground iguana | Cyclura rileyi cristata | Threatened | Wherever found | 06-22-1983 |
| White cockatoo | Cacatua alba | Threatened | Wherever found | 06-24-2014 |
| White-collared mangabey | Cercocebus torquatus | Endangered | Wherever found | 10-19-1976 |
| White-eared (=buffy tufted-ear) marmoset | Callithrix aurita (=jacchus a.) | Endangered | Wherever found | 05-16-1986 |
| White eared pheasant | Crossoptilon crossoptilon | Endangered | Wherever found | 12-02-1970 |
| white-flippered penguin | Eudyptula albosignata | Threatened | Wherever found | 09-02-2010 |
| White-footed tamarin | Saguinus leucopus | Threatened | Wherever found | 10-19-1976 |
| White fringeless orchid | Platanthera integrilabia | Threatened | | 10-13-2016 |
| White irisette | Sisyrinchium dichotomum | Endangered | Wherever found | 09-26-1991 |
| White-naped Crane | Grus vipio | Endangered | Wherever found | 06-14-1976 |
| White-necked crow | Corvus leucognaphalus | Endangered | Wherever found | 04-03-1991 |
| White-necked rockfowl | Picathartes gymnocephalus | Endangered | Wherever found | 06-02-1970 |
| White-nosed saki | Chiropotes albinasus | Endangered | Wherever found | 06-02-1970 |
| White-rayed pentachaeta | Pentachaeta bellidiflora | Endangered | Wherever found | 02-03-1995 |
| White River spinedace | Lepidomeda albivallis | Endangered | Wherever found | 09-12-1985 |
| White River springfish | Crenichthys baileyi baileyi | Endangered | Wherever found | 09-27-1985 |
| White sedge | Carex albida | Endangered | Wherever found | 10-22-1997 |
| White sturgeon | Acipenser transmontanus | Endangered | U.S.A. (ID, MT), Canada (B.C.), (Kootenai R. system) | 09-06-1994 |
| White-tailed laurel Pigeon | Columba junoniae | Threatened | Wherever found | 01-12-1995 |
| White wartyback (pearlymussel) | Plethobasus cicatricosus | Experimental Population, Non-Essential | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) | 10-15-2007 |
| White wartyback (pearlymussel) | Plethobasus cicatricosus | Endangered | Wherever found | 06-14-1976 |
| White-winged cotinga | Xipholena atropurpurea | Endangered | Wherever found | 06-14-1976 |
| White-winged guan | Penelope albipennis | Endangered | Wherever found | 09-28-1990 |
| White-winged wood duck | Cairina scutulata | Endangered | Wherever found | 06-02-1970 |
| Whooping crane | Grus americana | Experimental Population, Non-Essential | U.S.A. (CO, ID, FL, NM, UT, and the western half of Wyoming) | 01-22-1993 |
| Whooping crane | Grus americana | Endangered | Wherever found, except where listed as an experimental population | 03-11-1967 |
| Whooping crane | Grus americana | Experimental Population, Non-Essential | U.S.A. (AL, AR, CO, FL, GA, ID, IL, IN, IA, KY, LA, MI, MN, MS, MO, NC, NM, OH, SC, TN, UT, VA, WI, WV, western half of WY) | 06-26-2001 |
| Whooping crane | Grus americana | Experimental Population, Non-Essential | U.S.A (Southwestern Louisiana) | 02-03-2011 |
| Whorled Sunflower | Helianthus verticillatus | Endangered | | 08-01-2014 |
| Wide-leaf warea | Warea amplexifolia | Endangered | | 04-29-1987 |
| Wild yak | Bos mutus (=grunniens m.) | Endangered | Wherever found | 06-02-1970 |
| Willamette daisy | Erigeron decumbens | Endangered | Wherever found | 01-25-2000 |
| Willowy monardella | Monardella viminea | Endangered | Wherever found | 10-13-1998 |
| Winged Mapleleaf | Quadrula fragosa | Endangered | Wherever found, except where listed as an experimental population | 06-20-1991 |
| Winged Mapleleaf | Quadrula fragosa | Experimental Population, Non-Essential | U.S.A. (AL-specified portions of the Tennessee River; see 17.85(a)(1)) | 06-14-2001 |
| Winkler cactus | Pediocactus winkleri | Threatened | Wherever found | 08-20-1998 |
| Wireweed | Polygonella basiramia | Endangered | | 01-21-1987 |
| Wood Bison | Bison bison athabascae | Experimental Population, Non-Essential | U.S.A. (Alaska) | 05-07-2014 |
| Wood Bison | Bison bison athabascae | Threatened | Wherever found | 06-02-1970 |
| Wood stork | Mycteria americana | Threatened | U.S.A. (AL, FL, GA, MS, NC, SC) | 02-28-1984 |
| Woolly spider monkey | Brachyteles arachnoides | Endangered | Wherever found | 06-02-1970 |
| Woundfin | Plagopterus argentissimus | Experimental Population, Non-Essential | Gila R. drainage, AZ, NM | 07-24-1985 |
| Woundfin | Plagopterus argentissimus | Endangered | Wherever found, except where listed as an experimental population | 10-13-1970 |
| Wright fishhook cactus | Sclerocactus wrightiae | Endangered | Wherever found | 10-11-1979 |
| Wright's marsh thistle | Cirsium wrightii | Threatened | | 05-25-2023 |
| Wyoming Toad | Anaxyrus baxteri | Endangered | Wherever found | 01-17-1984 |
| Yacare Caiman | Caiman yacare | Threatened | Wherever found | 06-02-1970 |
| Yadon's piperia | Piperia yadonii | Endangered | Wherever found | 08-12-1998 |
| Yangtze Sturgeon | Acipenser dabryanus | Endangered | Wherever found | 05-26-2021 |
| Yaqui catfish | Ictalurus pricei | Threatened | Wherever found | 08-31-1984 |
| Yaqui chub | Gila purpurea | Endangered | Wherever found | 08-31-1984 |
| Yarkand deer | Cervus elaphus yarkandensis | Endangered | Wherever found | 07-27-1979 |
| Yellow-billed Cuckoo | Coccyzus americanus | Threatened | Western DPS: U.S.A. (AZ, CA, CO (western), ID, MT (western), NM (western), NV, OR, TX (western), UT, WA, WY (western)); Canada (British Columbia (southwestern); Mexico (Baja California, Baja California Sur, Chihuahua, Durango (western), Sinaloa, Sonora) | 11-03-2014 |
| Yellow-billed parrot | Amazona collaria | Threatened | Wherever found | 04-11-2013 |
| Yellow blossom (pearlymussel) | Epioblasma florentina florentina | Endangered | Wherever found; Except where listed as Experimental Populations | 06-14-1976 |
| Yellow blossom (pearlymussel) | Epioblasma florentina florentina | Experimental Population, Non-Essential | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) | 06-14-2001 |
| Yellow-blotched map turtle | Graptemys flavimaculata | Threatened | Wherever found | 01-14-1991 |
| Yellowcheek Darter | Etheostoma moorei | Endangered | Wherever found | 09-08-2011 |
| Yellow-crested cockatoo | Cacatua sulphurea | Endangered | Wherever found | 06-24-2014 |
| yellow-eyed penguin | Megadyptes antipodes | Threatened | Wherever found | 09-02-2010 |
| yelloweye rockfish | Sebastes ruberrimus | Threatened | Puget Sound - Georgia Basin DPS See 50 CFR 223.102 | 04-13-2011 |
| Yellowfin madtom | Noturus flavipinnis | Experimental Population, Non-Essential | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.84(e)(1)(iii)) | 10-15-2007 |
| Yellowfin madtom | Noturus flavipinnis | Threatened | Wherever found, except where listed as an experimental population | 10-11-1977 |
| Yellowfin madtom | Noturus flavipinnis | Experimental Population, Non-Essential | U.S.A. (TN, VA-specified portions of the Holston River and watershed; see 17.84(e)(1)(i)) | 08-04-1988 |
| Yellowfin madtom | Noturus flavipinnis | Experimental Population, Non-Essential | U.S.A. (TN-specified portions of the Tellico River; see 17.84(e)(1)(ii)) | 08-12-2002 |
| Yellow-footed rock wallaby | Petrogale xanthopus | Endangered | Wherever found | 06-04-1973 |
| Yellow lance | Elliptio lanceolata | Threatened | Wherever found | 05-03-2018 |
| Yellow larkspur | Delphinium luteum | Endangered | Wherever found | 01-26-2000 |
| Yellow monitor | Varanus flavescens | Endangered | Wherever found | 06-14-1976 |
| Yellow-shouldered blackbird | Agelaius xanthomus | Endangered | Wherever found | 12-12-1976 |
| Yellow-tailed woolly monkey | Lagothrix flavicauda | Endangered | Wherever found | 10-19-1976 |
| Yelm pocket gopher | Thomomys mazama yelmensis | Threatened | Wherever found | 05-09-2014 |
| Yosemite toad | Anaxyrus canorus | Threatened | Wherever found | 06-30-2014 |
| Yreka phlox | Phlox hirsuta | Endangered | Wherever found | 02-03-2000 |
| Yuma Ridgway's rail | Rallus obsoletus yumanensis | Endangered | Wherever found | 03-11-1967 |
| Yunnan snub-nosed monkey | Rhinopithecus bieti | Endangered | Wherever found | 09-27-1990 |
| Zanzibar red colobus monkey | Procolobus (=Colobus) pennantii (=kirki) kirki | Endangered | Wherever found | 06-02-1970 |
| Zanzibar suni | Neotragus moschatus moschatus | Endangered | Wherever found | 07-27-1979 |
| Zapata bladderpod | Physaria thamnophila | Endangered | Wherever found | 11-22-1999 |
| Zayante band-winged grasshopper | Trimerotropis infantilis | Endangered | Wherever found | 01-24-1997 |
| Zuni bluehead Sucker | Catostomus discobolus yarrowi | Endangered | Wherever found | 08-25-2014 |
| Zuni fleabane | Erigeron rhizomatus | Threatened | Wherever found | 04-26-1985 |