Listed Invertebrate Animals
286 Records
Parameters:
- Group Type: Invertebrates
- Listing Statuses: Endangered, Threatened, Emergency Listing, Endangered, Emergency Listing, Threatened, Similarity of Appearance (Endangered), Similarity of Appearance (Threatened)
- Listed in the US
When searching by State,
please note that a species will show up in the report only if it has a spatial current range.
State associations for a species are based on a spatial current range delineated by
FWS biologists in TESS (and not all species have spatial current range delineated at
the present time).
The current range of species entities consisting of one or more populations does not include states or countries outside those population boundaries, even though the species may occur there in a population not covered by the Endangered Species Act.
The current range of species entities consisting of one or more populations does not include states or countries outside those population boundaries, even though the species may occur there in a population not covered by the Endangered Species Act.
| Scientific Name | Common Name | Lead Region | Federal Listing Status | Where Listed |
|---|---|---|---|---|
| Achatinella spp. | Oahu tree snails | 1 | Endangered | Wherever found |
| Acropora cervicornis | Staghorn coral | NMFS | Threatened | Wherever found |
| Acropora palmata | Elkhorn coral | NMFS | Threatened | Wherever found |
| Adelocosa anops | Kauai cave wolf or pe'e pe'e maka 'ole spider | 1 | Endangered | Wherever found |
| Alasmidonta atropurpurea | Cumberland elktoe | 4 | Endangered | Wherever found |
| Alasmidonta heterodon | Dwarf wedgemussel | 5 | Endangered | Wherever found |
| Alasmidonta raveneliana | Appalachian elktoe | 4 | Endangered | Wherever found |
| Amblema neislerii | Fat threeridge (mussel) | 4 | Endangered | Wherever found |
| Ambrysus amargosus | Ash Meadows naucorid | 8 | Threatened | Wherever found |
| Anaea troglodyta floridalis | Florida leafwing Butterfly | 4 | Endangered | Wherever found |
| Anguispira picta | Painted snake coiled forest snail | 4 | Threatened | Wherever found |
| Antrobia culveri | Tumbling Creek cavesnail | 3 | Endangered | Wherever found |
| Antrolana lira | Madison Cave isopod | 5 | Threatened | Wherever found |
| Apodemia mormo langei | Lange's metalmark butterfly | 8 | Endangered | Wherever found |
| Arcidens wheeleri | Ouachita rock pocketbook | 2 | Endangered | Wherever found |
| Assiminea pecos | Pecos assiminea snail | 2 | Endangered | Wherever found |
| Athearnia anthonyi | Anthony's riversnail | 4 | Endangered | Wherever found; Except where listed as Experimental Populations |
| Atlantea tulita | Puerto Rican harlequin butterfly | 4 | Threatened | Wherever found |
| Batrisodes texanus | Coffin Cave mold beetle | 2 | Endangered | Wherever found |
| Batrisodes venyivi | Helotes mold beetle | 2 | Endangered | Wherever found |
| Boloria acrocnema | Uncompahgre fritillary butterfly | 6 | Endangered | Wherever found |
| Bombus affinis | Rusty patched bumble bee | 3 | Endangered | Wherever found |
| Bombus franklini | Franklin's bumble bee | 1 | Endangered | Wherever found |
| Branchinecta conservatio | Conservancy fairy shrimp | 8 | Endangered | Wherever found |
| Branchinecta longiantenna | Longhorn fairy shrimp | 8 | Endangered | Wherever found |
| Branchinecta lynchi | Vernal pool fairy shrimp | 8 | Threatened | Wherever found |
| Branchinecta sandiegonensis | San Diego fairy shrimp | 8 | Endangered | Wherever found |
| Brychius hungerfordi | Hungerford's crawling water Beetle | 3 | Endangered | Wherever found |
| Callophrys mossii bayensis | San Bruno elfin butterfly | 8 | Endangered | Wherever found |
| Cambarus aculabrum | Benton County cave crayfish | 4 | Endangered | Wherever found |
| Cambarus callainus | Big Sandy crayfish | 5 | Threatened | Wherever found |
| Cambarus cracens | Slenderclaw crayfish | 4 | Endangered | Wherever found |
| Cambarus veteranus | Guyandotte River crayfish | 5 | Endangered | Wherever found |
| Cambarus zophonastes | Hell Creek Cave crayfish | 4 | Endangered | Wherever found |
| Campeloma decampi | Slender campeloma | 4 | Endangered | Wherever found |
| Cicindela nevadica lincolniana | Salt Creek Tiger beetle | 6 | Endangered | Wherever found |
| Cicindela ohlone | Ohlone tiger beetle | 8 | Endangered | Wherever found |
| Cicindelidia floridana | Miami tiger beetle | 4 | Endangered | Wherever found |
| Cicurina baronia | Robber Baron Cave Meshweaver | 2 | Endangered | Wherever found |
| Cicurina madla | Madla Cave Meshweaver | 2 | Endangered | Wherever found |
| Cicurina vespera | Government Canyon Bat Cave meshweaver | 2 | Endangered | Wherever found |
| Cumberlandia monodonta | Spectaclecase (mussel) | 3 | Endangered | Wherever found |
| Cyclargus ammon | Nickerbean Blue Butterfly | 4 | Similarity of Appearance to a Threatened Taxon | Wherever found |
| Cyclargus (=Hemiargus) thomasi bethunebakeri | Miami Blue Butterfly | 4 | Endangered | Wherever found |
| Cyprogenia aberti | Western fanshell | 3 | Threatened | Wherever found |
| Cyprogenia sp. cf. aberti | Ouachita fanshell | 4 | Threatened | Entire |
| Cyprogenia stegaria | Fanshell | 4 | Endangered | Wherever found |
| Dendrogyra cylindrus | Pillar Coral | NMFS | Threatened | Wherever found |
| Desmocerus californicus dimorphus | Valley elderberry longhorn beetle | 8 | Threatened | Wherever found |
| Dinacoma caseyi | Casey's June Beetle | 8 | Endangered | Wherever found |
| Discus macclintocki | Iowa Pleistocene snail | 3 | Endangered | Wherever found |
| Dromus dromas | Dromedary pearlymussel | 4 | Endangered | Wherever found; Except where listed as Experimental Populations |
| Drosophila aglaia | Hawaiian picture-wing fly | 1 | Endangered | Wherever found |
| Drosophila differens | Hawaiian picture-wing fly | 1 | Endangered | Wherever found |
| Drosophila digressa | Hawaiian picture-wing fly | 1 | Endangered | Wherever found |
| Drosophila hemipeza | Hawaiian picture-wing fly | 1 | Endangered | Wherever found |
| Drosophila heteroneura | Hawaiian picture-wing fly | 1 | Endangered | Wherever found |
| Drosophila montgomeryi | Hawaiian picture-wing fly | 1 | Endangered | Wherever found |
| Drosophila mulli | Hawaiian picture-wing fly | 1 | Threatened | Wherever found |
| Drosophila musaphilia | Hawaiian picture-wing fly | 1 | Endangered | Wherever found |
| Drosophila neoclavisetae | Hawaiian picture-wing fly | 1 | Endangered | Wherever found |
| Drosophila obatai | Hawaiian picture-wing fly | 1 | Endangered | Wherever found |
| Drosophila ochrobasis | Hawaiian picture-wing fly | 1 | Endangered | Wherever found |
| Drosophila sharpi | Hawaiian picture-wing fly | 1 | Endangered | Wherever found |
| Drosophila substenoptera | Hawaiian picture-wing fly | 1 | Endangered | Wherever found |
| Drosophila tarphytrichia | Hawaiian picture-wing fly | 1 | Endangered | Wherever found |
| Elaphrus viridis | Delta green ground beetle | 8 | Threatened | Wherever found |
| Elimia crenatella | Lacy elimia (snail) | 4 | Threatened | Wherever found |
| Ellipsoptera puritana | Puritan tiger beetle | 5 | Threatened | Wherever found |
| Elliptio chipolaensis | Chipola slabshell | 4 | Threatened | Wherever found |
| Elliptio lanceolata | Yellow lance | 4 | Threatened | Wherever found |
| Elliptio spinosa | Altamaha Spinymussel | 4 | Endangered | Wherever found |
| Elliptoideus sloatianus | Purple bankclimber (mussel) | 4 | Threatened | Wherever found |
| Epioblasma brevidens | Cumberlandian combshell | 4 | Endangered | Wherever found; Except where listed as Experimental Populations |
| Epioblasma capsaeformis | Oyster mussel | 4 | Endangered | Wherever found; Except where listed as Experimental Populations |
| Epioblasma florentina curtisii | Curtis pearlymussel | 3 | Endangered | Wherever found |
| Epioblasma florentina walkeri (=E. walkeri) | Tan riffleshell | 4 | Endangered | Wherever found |
| Epioblasma obliquata | Purple Cat's paw (=Purple Cat's paw pearlymussel) | 3 | Endangered | Wherever found; Except where listed as Experimental Populations |
| Epioblasma penita | Southern combshell | 4 | Endangered | Wherever found |
| Epioblasma perobliqua | White catspaw (pearlymussel) | 3 | Endangered | Wherever found |
| Epioblasma rangiana | Northern riffleshell | 5 | Endangered | Wherever found |
| Epioblasma triquetra | Snuffbox mussel | 3 | Endangered | Wherever found |
| Erinna newcombi | Newcomb's snail | 1 | Threatened | Wherever found |
| Eua zebrina | Snail [no common name] | 1 | Endangered | Wherever found |
| Euchloe ausonides insulanus | Island marble Butterfly | 1 | Endangered | Wherever found |
| Euphilotes battoides allyni | El Segundo blue butterfly | 8 | Endangered | Wherever found |
| Euphilotes enoptes smithi | Smith's blue butterfly | 8 | Endangered | Wherever found |
| Euphydryas anicia cloudcrofti | Sacramento Mountains checkerspot Butterfly | 2 | Endangered | Wherever found |
| Euphydryas editha bayensis | Bay checkerspot butterfly | 8 | Threatened | Wherever found |
| Euphydryas editha quino (=E. e. wrighti) | Quino checkerspot butterfly | 8 | Endangered | Wherever found |
| Euphydryas editha taylori | Taylor's (=whulge) Checkerspot | 1 | Endangered | Wherever found |
| Euproserpinus euterpe | Kern primrose sphinx moth | 8 | Threatened | Wherever found |
| Faxonius peruncus | Big Creek Crayfish | 3 | Threatened | Entire |
| Faxonius quadruncus | St. Francis River Crayfish | 3 | Threatened | Entire |
| Fusconaia burkei | Tapered pigtoe | 4 | Threatened | Wherever found |
| Fusconaia cor | Shiny pigtoe | 4 | Endangered | Wherever found; Except where listed as Experimental Populations |
| Fusconaia cuneolus | Finerayed pigtoe | 4 | Endangered | Wherever found; Except where listed as Experimental Populations |
| Fusconaia escambia | Narrow pigtoe | 4 | Threatened | Wherever found |
| Fusconaia masoni | Atlantic pigtoe | 4 | Threatened | Wherever found |
| Fusconaia subrotunda | Longsolid | 4 | Threatened | Wherever found |
| Gammarus acherondytes | Illinois cave amphipod | 3 | Endangered | Wherever found |
| Gammarus desperatus | Noel's Amphipod | 2 | Endangered | Wherever found |
| Gammarus hyalleloides | Diminutive Amphipod | 2 | Endangered | Wherever found |
| Gammarus pecos | Pecos amphipod | 2 | Endangered | Wherever found |
| Glaucopsyche lygdamus palosverdesensis | Palos Verdes blue butterfly | 8 | Endangered | Wherever found |
| Haliotis cracherodii | Black Abalone | NMFS | Endangered | Wherever found |
| Haliotis sorenseni | White Abalone | NMFS | Endangered | North America (West Coast from Point Conception, CA, U.S.A., to Punta Abreojos, Baja California, Mexico) |
| Hamiota altilis | Finelined pocketbook | 4 | Threatened | Wherever found |
| Hamiota australis | Southern Sandshell | 4 | Threatened | Wherever found |
| Hamiota perovalis | Orangenacre mucket | 4 | Threatened | Wherever found |
| Hamiota subangulata | Shinyrayed pocketbook | 4 | Endangered | Wherever found |
| Helminthoglypta walkeriana | Morro shoulderband (=Banded dune) snail | 8 | Threatened | Wherever found |
| Hemiargus ceraunus antibubastus | Ceraunus Blue Butterfly | 4 | Similarity of Appearance to a Threatened Taxon | Wherever found |
| Hemileuca maia menyanthevora (=H. iroquois) | bog buck moth | 5 | Endangered | Wherever found |
| Hemistena lata | Cracking pearlymussel | 4 | Endangered | Wherever found; Except where listed as Experimental Populations |
| Heraclides aristodemus ponceanus | Schaus swallowtail butterfly | 4 | Endangered | Wherever found |
| Hesperia dacotae | Dakota Skipper | 3 | Threatened | Wherever found |
| Hesperia leonardus montana | Pawnee montane skipper | 6 | Threatened | Wherever found |
| Heterelmis comalensis | Comal Springs riffle beetle | 2 | Endangered | Wherever found |
| Hylaeus anthracinus | Anthricinan yellow-faced bee | 1 | Endangered | Wherever found |
| Hylaeus assimulans | Assimulans yellow-faced bee | 1 | Endangered | Wherever found |
| Hylaeus facilis | Easy yellow-faced bee | 1 | Endangered | Wherever found |
| Hylaeus hilaris | Hilaris yellow-faced bee | 1 | Endangered | Wherever found |
| Hylaeus kuakea | Hawaiian yellow-faced bee | 1 | Endangered | Wherever found |
| Hylaeus longiceps | Hawaiian yellow-faced bee | 1 | Endangered | Wherever found |
| Hylaeus mana | Hawaiian yellow-faced bee | 1 | Endangered | Wherever found |
| Hypolimnas octocula marianensis | Mariana eight-spot butterfly | 1 | Endangered | Wherever found |
| Icaricia icarioides fenderi | Fender's blue butterfly | 1 | Threatened | Wherever found |
| Icaricia icarioides missionensis | Mission blue butterfly | 8 | Endangered | Wherever found |
| Icaricia (Plebejus) shasta charlestonensis | Mount Charleston blue butterfly | 8 | Endangered | Wherever found |
| Idaholanx fresti | Banbury Springs limpet | 1 | Endangered | Wherever found |
| Ischnura luta | Rota blue damselfly | 1 | Endangered | Wherever found |
| Juturnia kosteri | Koster's springsnail | 2 | Endangered | Wherever found |
| Lampsilis abrupta | Pink mucket (pearlymussel) | 3 | Endangered | Wherever found |
| Lampsilis higginsii | Higgins eye (pearlymussel) | 3 | Endangered | Wherever found |
| Lampsilis powellii | Arkansas fatmucket | 4 | Threatened | Wherever found |
| Lampsilis rafinesqueana | Neosho Mucket | 4 | Endangered | Wherever found |
| Lampsilis streckeri | Speckled pocketbook | 4 | Endangered | Wherever found |
| Lampsilis virescens | Alabama lampmussel | 4 | Endangered | Wherever found; Except where listed as Experimental Populations |
| Lasmigona decorata | Carolina heelsplitter | 4 | Endangered | Wherever found |
| Lednia tumana | Meltwater lednian stonefly | 6 | Threatened | Wherever found |
| Lemiox rimosus | Birdwing pearlymussel | 4 | Endangered | Wherever found; Except where listed as Experimental Populations |
| Lepidurus packardi | Vernal pool tadpole shrimp | 8 | Endangered | Wherever found |
| Leptodea leptodon | Scaleshell mussel | 3 | Endangered | Wherever found |
| Leptotes cassius theonus | Cassius Blue Butterfly | 4 | Similarity of Appearance to a Threatened Taxon | Wherever found |
| Leptoxis ampla | Round rocksnail | 4 | Threatened | Wherever found |
| Leptoxis foremani | Interrupted (=Georgia) Rocksnail | 4 | Endangered | Wherever found |
| Leptoxis plicata | Plicate rocksnail | 4 | Endangered | Wherever found |
| Leptoxis taeniata | Painted rocksnail | 4 | Threatened | Wherever found |
| Lepyrium showalteri | Flat pebblesnail | 4 | Endangered | Wherever found |
| Lioplax cyclostomaformis | Cylindrical lioplax (snail) | 4 | Endangered | Wherever found |
| Lirceus usdagalun | Lee County cave isopod | 5 | Endangered | Wherever found |
| Lycaeides argyrognomon lotis | Lotis blue butterfly | 8 | Endangered | Wherever found |
| Lycaeides melissa samuelis | Karner blue butterfly | 3 | Endangered | Wherever found |
| Lycaena hermes | Hermes copper butterfly | 8 | Threatened | Wherever found |
| Manduca blackburni | Blackburn's sphinx moth | 1 | Endangered | Wherever found |
| Margaritifera hembeli | Louisiana pearlshell | 4 | Threatened | Wherever found |
| Margaritifera marrianae | Alabama pearlshell | 4 | Endangered | Wherever found |
| Marstonia ogmorhaphe | Royal marstonia (snail) | 4 | Endangered | Wherever found |
| Marstonia pachyta | Armored snail | 4 | Endangered | Wherever found |
| Medionidus acutissimus | Alabama moccasinshell | 4 | Threatened | Wherever found |
| Medionidus parvulus | Coosa moccasinshell | 4 | Endangered | Wherever found |
| Medionidus penicillatus | Gulf moccasinshell | 4 | Endangered | Wherever found |
| Medionidus simpsonianus | Ochlockonee moccasinshell | 4 | Endangered | Wherever found |
| Medionidus walkeri | Suwannee moccasinshell | 4 | Threatened | Wherever found |
| Megalagrion leptodemas | Crimson Hawaiian damselfly | 1 | Endangered | Wherever found |
| Megalagrion nesiotes | Flying earwig Hawaiian damselfly | 1 | Endangered | Wherever found |
| Megalagrion nigrohamatum nigrolineatum | Blackline Hawaiian damselfly | 1 | Endangered | Wherever found |
| Megalagrion oceanicum | Oceanic Hawaiian damselfly | 1 | Endangered | Wherever found |
| Megalagrion pacificum | Pacific Hawaiian damselfly | 1 | Endangered | Wherever found |
| Megalagrion xanthomelas | Orangeblack Hawaiian damselfly | 1 | Endangered | Wherever found |
| Mesodon clarki nantahala | noonday snail | 4 | Threatened | Wherever found |
| Microhexura montivaga | Spruce-fir moss spider | 4 | Endangered | Wherever found |
| Mycetophyllia ferox | Rough Cactus Coral | NMFS | Threatened | Wherever found |
| Neonympha mitchellii francisci | Saint Francis' satyr butterfly | 4 | Endangered | Wherever found |
| Neonympha mitchellii mitchellii | Mitchell's satyr Butterfly | 3 | Endangered | Wherever found |
| Newcombia cumingi | Newcomb's Tree snail | 1 | Endangered | Wherever found |
| Nicrophorus americanus | American burying beetle | 2 | Threatened | Wherever found, except where listed as an experimental population |
| Novisuccinea chittenangoensis | Chittenango ovate amber snail | 5 | Threatened | Wherever found |
| Oarisma poweshiek | Poweshiek skipperling | 3 | Endangered | Wherever found |
| Obovaria choctawensis | Choctaw bean | 4 | Endangered | Wherever found |
| Obovaria retusa | Ring pink (mussel) | 4 | Endangered | Wherever found |
| Obovaria subrotunda | Round hickorynut | 3 | Threatened | Wherever found |
| Orbicella annularis | Lobed Star Coral | NMFS | Threatened | Wherever found |
| Orbicella faveolata | Mountainous Star Coral | NMFS | Threatened | Wherever found |
| Orbicella franksi | Boulder star coral | NMFS | Threatened | Wherever found |
| Orconectes shoupi | Nashville crayfish | 4 | Endangered | Wherever found |
| Orthalicus reses (not incl. nesodryas) | Stock Island tree snail | 4 | Threatened | Wherever found |
| Ostodes strigatus | Snail [no common name] | 1 | Endangered | Wherever found |
| Pacifastacus fortis | Shasta crayfish | 8 | Endangered | Wherever found |
| Palaemonetes cummingi | Squirrel Chimney Cave shrimp | 4 | Threatened | Wherever found |
| Palaemonias alabamae | Alabama cave shrimp | 4 | Endangered | Wherever found |
| Palaemonias ganteri | Kentucky cave shrimp | 4 | Endangered | Wherever found |
| Partula gibba | Humped tree snail | 1 | Endangered | Wherever found |
| Partula langfordi | Langford's tree snail | 1 | Endangered | Wherever found |
| Partula radiolata | Guam tree snail | 1 | Endangered | Wherever found |
| Partulina semicarinata | Lanai tree snail | 1 | Endangered | Wherever found |
| Partulina variabilis | Lanai tree snail | 1 | Endangered | Wherever found |
| Parvaspina collina | James spinymussel | 5 | Endangered | Wherever found |
| Parvaspina steinstansana | Tar River spinymussel | 4 | Endangered | Wherever found |
| Pegias fabula | Littlewing pearlymussel | 4 | Endangered | Wherever found |
| Physella natricina | Snake River physa snail | 1 | Endangered | Wherever found |
| Planorbella magnifica | Magnificent ramshorn | 4 | Endangered | Wherever found |
| Plethobasus cicatricosus | White wartyback (pearlymussel) | 4 | Endangered | Wherever found |
| Plethobasus cooperianus | Orangefoot pimpleback (pearlymussel) | 4 | Endangered | Wherever found |
| Plethobasus cyphyus | Sheepnose Mussel | 3 | Endangered | Wherever found |
| Pleurobema athearni | Canoe Creek Clubshell | 4 | Endangered | Wherever found |
| Pleurobema clava | Clubshell | 5 | Endangered | Wherever found; Except where listed as Experimental Populations |
| Pleurobema curtum | Black clubshell | 4 | Endangered | Wherever found |
| Pleurobema decisum | Southern clubshell | 4 | Endangered | Wherever found |
| Pleurobema furvum | Dark pigtoe | 4 | Endangered | Wherever found |
| Pleurobema georgianum | Southern pigtoe | 4 | Endangered | Wherever found |
| Pleurobema hanleyianum | Georgia pigtoe | 4 | Endangered | Wherever found |
| Pleurobema perovatum | Ovate clubshell | 4 | Endangered | Wherever found |
| Pleurobema plenum | Rough pigtoe | 4 | Endangered | Wherever found |
| Pleurobema pyriforme | Oval pigtoe | 4 | Endangered | Wherever found |
| Pleurobema strodeanum | Fuzzy pigtoe | 4 | Threatened | Wherever found |
| Pleurobema taitianum | Heavy pigtoe | 4 | Endangered | Wherever found |
| Pleurocera foremani | Rough hornsnail | 4 | Endangered | Wherever found |
| Pleuronaia dolabelloides | Slabside Pearlymussel | 4 | Endangered | Wherever found |
| Pleuronaia gibber | Cumberland pigtoe | 4 | Endangered | Wherever found |
| Polygyriscus virginianus | Virginia fringed mountain snail | 5 | Endangered | Wherever found |
| Polyphylla barbata | Mount Hermon June beetle | 8 | Endangered | Wherever found |
| Popenaias popeii | Texas Hornshell | 2 | Endangered | Wherever found |
| Potamilus capax | Fat pocketbook | 4 | Endangered | Wherever found |
| Potamilus inflatus | Inflated heelsplitter | 4 | Threatened | Wherever found |
| Procambarus econfinae | Panama City crayfish | 4 | Threatened | Wherever found |
| Procaris hawaiana | Anchialine pool Shrimp | 1 | Endangered | Wherever found |
| Pseudocopaeodes eunus obscurus | Carson wandering skipper | 8 | Endangered | Wherever found |
| Pseudotryonia adamantina | Diamond Tryonia | 2 | Endangered | Wherever found |
| Ptychobranchus greenii | Triangular Kidneyshell | 4 | Endangered | Wherever found |
| Ptychobranchus jonesi | Southern kidneyshell | 4 | Endangered | Wherever found |
| Ptychobranchus subtentus | Fluted kidneyshell | 4 | Endangered | Wherever found |
| Pyrgulopsis bernardina | San Bernardino springsnail | 2 | Threatened | Wherever found |
| Pyrgulopsis bruneauensis | Bruneau Hot springsnail | 1 | Endangered | Wherever found |
| Pyrgulopsis chupaderae | Chupadera springsnail | 2 | Endangered | Wherever found |
| Pyrgulopsis neomexicana | Socorro springsnail | 2 | Endangered | Wherever found |
| Pyrgulopsis roswellensis | Roswell springsnail | 2 | Endangered | Wherever found |
| Pyrgulopsis texana | Phantom Springsnail | 2 | Endangered | Wherever found |
| Pyrgulopsis trivialis | Three Forks Springsnail | 2 | Endangered | Wherever found |
| Pyrgus ruralis lagunae | Laguna Mountains skipper | 8 | Endangered | Wherever found |
| Quadrula cylindrica cylindrica | Rabbitsfoot | 4 | Threatened | Wherever found |
| Quadrula cylindrica strigillata | Rough rabbitsfoot | 5 | Endangered | Wherever found |
| Quadrula fragosa | Winged Mapleleaf | 3 | Endangered | Wherever found, except where listed as an experimental population |
| Reginaia rotulata | Round Ebonyshell | 4 | Endangered | Wherever found |
| Rhadine exilis | [no common name] Beetle | 2 | Endangered | Wherever found |
| Rhadine infernalis | [no common name] Beetle | 2 | Endangered | Wherever found |
| Rhadine persephone | Tooth Cave ground beetle | 2 | Endangered | Wherever found |
| Rhaphiomidas terminatus abdominalis | Delhi Sands flower-loving fly | 8 | Endangered | Wherever found |
| Samoana fragilis | Fragile tree snail | 1 | Endangered | Wherever found |
| Somatochlora hineana | Hine's emerald dragonfly | 3 | Endangered | Wherever found |
| Spelaeorchestia koloana | Kauai cave amphipod | 1 | Endangered | Wherever found |
| Speyeria callippe callippe | Callippe silverspot butterfly | 8 | Endangered | Wherever found |
| Speyeria zerene behrensii | Behren's silverspot butterfly | 8 | Endangered | Wherever found |
| Speyeria zerene hippolyta | Oregon silverspot butterfly | 1 | Threatened | Wherever found |
| Speyeria zerene myrtleae | Myrtle's silverspot butterfly | 8 | Endangered | Wherever found |
| Streptocephalus woottoni | Riverside fairy shrimp | 8 | Endangered | Wherever found |
| Strymon acis bartrami | Bartram's hairstreak Butterfly | 4 | Endangered | Wherever found |
| Stygobromus hayi | Hay's Spring amphipod | 5 | Endangered | Wherever found |
| Stygobromus (=Stygonectes) pecki | Peck's cave amphipod | 2 | Endangered | Wherever found |
| Stygoparnus comalensis | Comal Springs dryopid beetle | 2 | Endangered | Wherever found |
| Syncaris pacifica | California freshwater shrimp | 8 | Endangered | Wherever found |
| Tartarocreagris texana | Tooth Cave pseudoscorpion | 2 | Endangered | Wherever found |
| Taylorconcha serpenticola | Bliss Rapids snail | 1 | Threatened | Wherever found |
| Tayshaneta microps | Government Canyon Bat Cave spider | 2 | Endangered | Wherever found |
| Tayshaneta myopica | Tooth Cave spider | 2 | Endangered | Wherever found |
| Texamaurops reddelli | Kretschmarr Cave mold beetle | 2 | Endangered | Wherever found |
| Texella cokendolpheri | Cokendolpher Cave Harvestman | 2 | Endangered | Wherever found |
| Texella reddelli | Bee Creek Cave harvestman | 2 | Endangered | Wherever found |
| Texella reyesi | Bone Cave harvestman | 2 | Endangered | Wherever found |
| Theliderma intermedia | Cumberland monkeyface (pearlymussel) | 4 | Endangered | Wherever found; Except where listed as Experimental Populations |
| Theliderma sparsa | Appalachian monkeyface (pearlymussel) | 5 | Endangered | Wherever found |
| Thermosphaeroma thermophilus | Socorro isopod | 2 | Endangered | Wherever found |
| Toxolasma cylindrellus | Pale lilliput (pearlymussel) | 4 | Endangered | Wherever found |
| Trimerotropis infantilis | Zayante band-winged grasshopper | 8 | Endangered | Wherever found |
| Triodopsis platysayoides | Flat-spired three-toothed Snail | 5 | Threatened | Wherever found |
| Tryonia alamosae | Alamosa springsnail | 2 | Endangered | Wherever found |
| Tryonia cheatumi | Phantom Tryonia | 2 | Endangered | Wherever found |
| Tryonia circumstriata (=stocktonensis) | Gonzales tryonia | 2 | Endangered | Wherever found |
| Tulotoma magnifica | Tulotoma snail | 4 | Threatened | Wherever found |
| Vagrans egistina | Mariana wandering butterfly | 1 | Endangered | Wherever found |
| Vetericaris chaceorum | Anchialine pool shrimp | 1 | Endangered | Wherever found |
| Villosa fabalis | Rayed Bean | 3 | Endangered | Wherever found |
| Villosa perpurpurea | Purple bean | 5 | Endangered | Wherever found |
| Villosa trabalis | Cumberland bean (pearlymussel) | 4 | Endangered | Wherever found; Except where listed as Experimental Populations |
| Zapada glacier | Western glacier stonefly | 6 | Threatened | Wherever found |