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flat pigtoe
The flat pigtoe or Marshall's mussel (''Pleurobema marshalli'') is a species of freshwater mussel in the family Unionidae, the river mussels. It is native to Alabama and Mississippi, but it has not been seen since 1980. Though it is still listed as critically endangered on the IUCN Red List〔Bogan, A.E. 1996. (''Pleurobema marshalli'' ). (2011 IUCN Red List of Threatened Species. ) Downloaded on 26 September 2011.〕 and as an endangered species on the US Endangered Species List,〔USFWS. (Endangered status for Marshall's Mussel (''Pleurobema marshalii'')... and Penitent Mussel (''Epioblasma'' (=''Dysnomia'') ''penita''). ) ''Federal Register'' April 7, 1987.〕 it is likely extinct.〔(''Pleurobema marshalli''. ) The Nature Conservancy.〕
This mussel was last seen in a stretch of the Tombigbee River before the habitat was destroyed by the installation of the Tennessee-Tombigbee Waterway.〔 No living or freshly dead specimens have been seen since.〔USFWS. (Tombigbee RIver Mussels 5-Year Review. ) April 2009.〕
==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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