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The Appalachian elktoe, scientific name ''Alasmidonta raveneliana'', is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels. ==Description== The Appalachian elktoe has a "thin, kidney-shaped shell, reaching up to about 10 centimeters (4 inches)." Younger mussels normally have a yellowish-brown periostracum (outer shell layer), while more mature mussels generally have a dark brown to greenish-brown periostracum. Features on the outer shell of the mussel, whether juvenile or adult, are often fine or hard to distinguish. In some cases streaks or waves are apparent, which are most easily noticeable on the dorsal region of the outer shell. Most individuals however have green waves, which are a similar hue as the rest of the shell and are often minute. Inside the shell, the nacre has a sheen which is white, blue, and silver. The center of the inner shell changes from a light, almost translucent shine, to a more pink or tan color. Some species have irregular spots or blotches in the center of the nacre that are much darker than the rest of the lining of the shell.〔Fridell, J. A. 1999. Appalachian elktoe in North Carolina.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「appalachian elktoe」の詳細全文を読む スポンサード リンク
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