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The Dreissenidae are a family of small freshwater mussels, aquatic bivalve mollusks. They attach themselves to stones or to any other hard surface using a byssus. The shells of these bivalves are shaped somewhat like those of true mussels, and they also attach themselves to a hard substrate using a byssus, however this group is not at all closely related to true mussels, being more closely related to the venus clams (Veneridae). ==Genera== Genera within the family Dreissenidae include: * ''Congeria'', a unique genus of cave-dwelling bivalves () * ''Dreissena'', the type genus of the family * ''Mytilopsis'' 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「Dreissenidae」の詳細全文を読む スポンサード リンク
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