Madison Cave isopod (Antrolana lira)

Federal Register | Recovery | Critical Habitat | Conservation Plans | Petitions | Life History

Listing Status:   

Where Listed: WHEREVER FOUND

General Information

The Madison Cave isopod is an eyeless, unpigmented, freshwater crustacean. It belongs to a family that consists of mostly marine species and a small number of freshwater species. The species is the only member of its genus and is the only freshwater cirolanid isopod north of Texas. Its body is flattened and bears seven pairs of long walking legs. The first pair of legs are modified as grasping structures. It has a pair of short antennae and a pair of long antennae. Males reach a length of 0.6 inches; females reach a length of 0.7 inches. While most cave isopods spend the majority of their time walking along the bottoms of streams and pools, Antrolana lira spends much of its time swimming freely through flooded caves formed in ancient limestone.

  • States/US Territories in which the Madison Cave isopod, Wherever found is known to or is believed to occur:  Virginia , West Virginia
  • US Counties in which the Madison Cave isopod, Wherever found is known to or is believed to occur:  View All
 
Current Listing Status Summary
Status Date Listed Lead Region Where Listed
1982-10-04 Northeast Region (Region 5) Wherever found

» Federal Register Documents

Federal Register Documents
Date Citation Page Title
1980-10-06 00:00:00.0 45 FR 66410 66411 ETWP; Proposed Threatened Status for the Madison Cave Isopod
2011-08-22 00:00:00.0 76 FR 52344 52345 Application for an Incidental Take Permit for the Madison Cave Isopod From Dominion Virginia Power; Low-Effect Habitat Conservation Plan
1982-10-04 00:00:00.0 47 FR 43699 43701 Listing the Madison Cave Isopod as Threatened Species
2008-12-16 00:00:00.0 73 FR 76373 76375 Initiation of 5-Year Reviews of 7 Listed Species: Notice of review; request for information
Special Rule Publications
Date Citation Page Title
1980-10-06 00:00:00.0 45 FR 66410 66411 ETWP; Proposed Threatened Status for the Madison Cave Isopod
1982-10-04 00:00:00.0 47 FR 43699 43701 Listing the Madison Cave Isopod as Threatened Species

» Recovery

Current Recovery Plan(s)
Date Title Plan Action Status Plan Status
1996-09-30 Madison Cave Isopod View Implementation Progress Final
Other Recovery Documents
Date Citation Page Title Document Type
2008-12-16 73 FR 76373 76375 Initiation of 5-Year Reviews of 7 Listed Species: Notice of review; request for information
  • Notice 5-year Review, Initiation

» Critical Habitat

No critical habitat rules have been published for the Madison Cave isopod.

» Conservation Plans

Habitat Conservation Plans (HCP) (learn more)
HCP Plan Summaries
Warren County Power Station Low Effect HCP

» Petitions

» Life History

Habitat Requirements

The Madison Cave isopod is found in flooded limestone caves beneath the Great Valley of Virginia and West Virginia where it swims freely through calcite-saturated waters of deep karst aquifers.

Food Habits

Its feeding habitats are unknown, however, it is believed to be carnivorous.

Movement / Home Range

Recent discoveries in caves and wells have extended the range of the species 200 miles. The range of the isopod is now known from a 15 mile wide belt stretching from Lexington VA to Charles Town, WV. There are documented population centers in the Waynesboro-Grottoes area (Augusta County, VA), the Harrisonburg area (Rockingham County, VA), and the valley of the main stem of the Shenandoah River (Warren and Clarke counties, VA, and Jefferson County, WV).

Reproductive Strategy

It is not known how this species reproduces.

Other

The population size of the Madison Cave isopod is unknown at most sites. Sampling results suggest that the population is dominated by adults. The population structure of the Madison Cave isopod suggests that it has a lengthy life span with a low rate of reproduction.

» Other Resources

NatureServe Explorer Species Reports -- NatureServe Explorer is a source for authoritative conservation information on more than 50,000 plants, animals and ecological communtities of the U.S and Canada. NatureServe Explorer provides in-depth information on rare and endangered species, but includes common plants and animals too. NatureServe Explorer is a product of NatureServe in collaboration with the Natural Heritage Network.

ITIS Reports -- ITIS (the Integrated Taxonomic Information System) is a source for authoritative taxonomic information on plants, animals, fungi, and microbes of North America and the world.

FWS Digital Media Library -- The U.S. Fish and Wildlife Service's National Digital Library is a searchable collection of selected images, historical artifacts, audio clips, publications, and video.