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The Sphaeriidae are a family of small to minute freshwater bivalve molluscs, in the order Veneroida; this family also includes the clams formerly placed in the Pisidiidae. In the US, they are commonly known as pea clams or fingernail clams.〔Heard, William H. 1965. Comparative life histories of North American pill clams (Sphaeriidae: ''Pisidium''). Malacologia, 2: 381-411.〕〔Heard, William H. 1977. Reproduction of fingernail clams (Sphaeriidae: ''Sphaerium'' and ''Musculium''). Malacologia, 16: 421-455.〕 ==Genera== Genera in the family Sphaeriidae include: * ''Musculium'' * ''Pisidium'' * ''Sphaerium'' 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「Sphaeriidae」の詳細全文を読む スポンサード リンク
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