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Bluemask darter
The bluemask darter (''Etheostoma akatulo'') is a species of darter endemic to the eastern United States. It is a federally listed endangered species of the United States. This fish was not formally described until 2009,〔Layman, S. R. and R. L. Mayden. (2009). (A new species of the darter subgenus ''Doration'' (Percidae: ''Etheostoma'') from the Caney Fork River System, Tennessee. ) ''Copeia'': February 2009, Vol. 2009, No. 1, pp. 157-170.〕 but it was added to the US Endangered Species List in 1993.〔USFWS. (Determination of Endangered Status for the Relict Darter and Bluemask (=Jewel) Darter. ) ''Federal Register'' December 27, 1993.〕 During breeding, the male has bright blue patches on its head and other areas.〔(''Etheostoma akatulo''. ) FishBase.〕 This fish is found only in the Caney Fork River system, a tributary of the Cumberland River in Tennessee.〔 The species name ''akatulo'' comes from the Cherokee for "mask", referring to the solid blue coloration on the lower face of the fish.〔
==Anatomy and appearance==
The species differs from other species of the subgenus Doration by having fully scaled cheeks, complete lateral line, breeding males with bright blue pigment completely covering the lower face, and breeding males with soft dorsal and anal fins lacking orange and blue pigment.〔
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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