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Cracking pearlymussel
The cracking pearlymussel (''Hemistena lata'') is an endangered species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae.
This species is native to the United States, where it remains only in Tennessee and Virginia. It was originally distributed in the Ohio River, Cumberland River and Tennessee River systems, but it has been extirpated from most of its previous range.
Parmalee and Bogan reported that there were still populations in the Clinch River in Tennessee.〔Parmalee, P. W. and Bogan, A. E. (1998) ''The Freshwater Mussels of Tennessee''. Knoxville, TN: (University of Tennessee Press ).〕 Other populations that are known to survive are located in the Powell and Elk Rivers.
==Shell description==
These mussels have thin, fairly weak, elongated shells. The shells may reach up to in height The outer coloring of the shell varies from yellow to brown, while the interior of the shell is pale bluish white, with a purple beak cavity.〔
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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