球蚬，软体动物门-瓣鳃纲-真瓣鳃目-球蚬科。维基百科Sphaerium is a genus of very small freshwater clams, aquatic bivalve mollusks 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.Species[edit]Subgenus Sphaerium Scopoli, 1777Sphaerium corneum (Linnaeus, 1758) - European fingernail clamSubgenus Nucleocyclas Alimov & Starobogatov, 1968Sphaerium nucleus (Studer, 1820)Sphaerium ovale (A. Férussac, 1807)Subgenus Parasphaerium Alimov & Starobogatov, 1968Sphaerium nitidum Clessin, 1876 - Arctic fingernail clamSubgenus Amesoda Rafinesque, 1820Sphaerium rivicola (Lamarck, 1818)Subgenus Cyrenastrum Bourguignat, 1854Sphaerium solidum (Normand, 1844)Without subgenusSphaerium asiaticum (Martens, 1864)Sphaerium bequaerti (Dautzenberg & Germain, 1914) - data deficient (DD)[1]Sphaerium cornutaSphaerium novaezelandiae Deshayes, 1854Sphaerium stuhlmanni