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Arkansia
''Arkansia'' is a monotypic genus〔USFWS. (''Arkansia wheeleri'' Recovery Plan. ) March 2004.〕 of freshwater mussels in the family Unionidae, the river mussels. The sole species in the genus is ''Arkansia wheeleri''. Its common names are the Ouachita rock pocketbook and Wheeler's pearly mussel.〔 The genus was named for the state of Arkansas, where the mussel was first discovered.〔
This is a federally listed endangered species of the United States.〔USFWS. (Final rule to list the Ouachita rock-pocketbook (mussel) as an endangered species. ) ''Federal Register'' October 23, 1991.〕
==Distribution==
This species is native to Arkansas, Oklahoma, and Texas in the United States, which have only four or five small, isolated populations.〔(''Arkansia wheeleri''. ) The Nature Conservancy.〕
Of the remaining populations, only the one located in the Kiamichi River in Oklahoma is viable.〔
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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