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Lirceus usdagalun
''Lirceus usdagalun'' is a rare species of crustacean known by the common name Lee County cave isopod. It is endemic to Virginia in the United States, where it is known from a single network of karst cave systems in Lee County. It is threatened by a number of processes. It is a federally listed endangered species of the United States.〔USFWS. (ETWP; Determination of Endangered Status for the Lee County Cave Isopod (''Lirceus usdagalun''). ) ''Federal Register'' November 20, 1992.〕
This isopod is a troglobite, an organism that spends its entire life in subterranean caves. It is roughly 7 millimeters long. It lacks eyes and pigmentation. It is flattened and has seven pairs of appendages.〔USFWS. (''Lirceus usdagalun'' Recovery Plan. ) September 30, 1997.〕 The species name, ''usdagalun'', is from a Cherokee word meaning "cave" or "hole under rock".〔
This organism is endemic to The Cedars, a cave region in the Powell River Valley of southwestern corner of Virginia. It is known from four cave systems. When it was listed as an endangered species, only two populations were known, one of which was thought to have been extirpated by pollution from sawmill sawdust. This population has since re-established itself in the cave after abatement of the pollution.〔USFWS. (''Lirceus usdagalun'' Five-year Review. ) September 2008.〕 The isopod is sensitive to changes in water quality.〔(''Lirceus usdagalun''. ) The Nature Conservancy.〕
The isopod lives underwater on rocks and gravel in subterranean caves. It is associated with other cave organisms, including the isopod ''Caecidotea recurvata'', the amphipod ''Crangonyx antennatus'', snails (genus ''Fontigens''), and planarians (genus ''Sphalloplana''). At least 33 rare species of animals and plants are found at The Cedars.〔
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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