Sphaerium
''Sphaerium'' is a genus of very small freshwater clams, aquatic bivalve molluscs in the family Sphaeriidae, known as the fingernail clams. The small clams in this genus are unusual in that many of them, such as ''Sphaerium corneum'', can climb around underwater on aquatic plants, using their long and strong foot. Selected species The following species are included in the genus ''Sphaerium'': *'' Sphaerium asiaticum'' *†'' Sphaerium beckmani'' *'' Sphaerium bequaerti'' *''Sphaerium corneum ''Sphaerium corneum'', also known as the European fingernailclam, is a very small freshwater clam, an aquatic bivalve mollusk in the family Sphaeriidae, the fingernail clams. Description The shell is fairly globular and can grow up to 9–13.5& ...'' – European fingernail clam *'' Sphaerium lacustre'' *'' Sphaerium nitidum'' – Arctic fingernail clam *'' Sphaerium novaezelandiae'' *'' Sphaerium nucleus'' *'' Sphaerium ovale'' *'' Sphaerium rhomboideum'' *'' Sphaerium rivi ...
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