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Pisidium casertanum : ウィキペディア英語版 | Pisidium casertanum
''Pisidium casertanum'', the pea cockle or pea clam, is a minute freshwater bivalve mollusc of the family Sphaeriidae. == Description == The shell is broad, sub-triangular or oval and is ornamented with sculpture of faint concentric striations.The umbos are slightly behind the middle.The Periostracum is silky, scarcely glossy. In colour it is whitish to grey-brown and often the shell is coated with reddish-brown deposits. The shell is of similar shape to ''Sphaerium novaezelandiae'' but is smaller as an adult, more inflated, with a deeper hinge-plate, stronger teeth, and the ligament is not visible externally. Length is up to 4.5 mm, height 3.7 mm, and thickness 2.3 mm.
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「Pisidium casertanum」の詳細全文を読む
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