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Duskytail darter
The duskytail darter (''Etheostoma percnurum'') is a species of darter endemic to the eastern United States where it is native to Kentucky, Tennessee, and Virginia, occurring in the drainages of the Cumberland and Tennessee Rivers.〔Blanton, R. E. and R. E. Jenkins. (2008). (Three new darter species of the ''Etheostoma percnurum'' species complex (Percidae, subgenus ''Catonotus'') from the Tennessee and Cumberland river drainages. ) ''Zootaxa'' 1963 1-24.〕 It was federally listed as an endangered species of the United States in 1993,〔USFWS. (Determination of Endangered Status for the Duskytail Darter, Palezone Shiner and Pygmy Madtom. ) ''Federal Register'' April 27, 1993.〕 shortly before it was formally described as a new species.
In 2008, examination of the morphology of this species led researchers to divide it into four species, describing the Citico darter (''Etheostoma sitikuense''), the marbled darter (''Etheostoma marmorpinnum''), and the tuxedo darter (''Etheostoma lemniscatum'') as new. Because ''E. percnurum'' carries the endangered species status, the three new species may be given that status.〔
These fish are threatened by the impoundment of waterways, increased silt, logging, coal mining, pollution, and disease.〔Jones Powers, G. L. and R. L. Mayden. (2003). (Threatened fishes of the world: ''Etheostoma percnurum'' Jenkins 1993 (Percidae). ) ''Environmental Biology of Fishes'' 67(4) 358.〕
==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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