Sphaerium

{{Short description|Genus of bivalves}}

{{Automatic taxobox

| taxon = Sphaerium

| image = Sphaerium corneum.jpg

| image_caption = Sphaerium corneum

| image2 = Freshwater Fingernail Clam.gif

| image2_caption = Live Sphaerium sp. moving around with its foot. Collected from a pond in Portland, Oregon

| authority = Scopoli, 1777

| display_parents = 3

| subdivision = See text.

| synonyms = {{hidden begin|title = List}}

• Amesoda Rafinesque, 1820
• Amesoda (Asiocyclas) Starobogatov & Korniushin, 1986
• Amesoda (Clessinicyclas) Alimov & Starobogatov, 1968
• Amesoda (Cyrenastrum) Bourguignat, 1854
• Amesodon Agassiz, 1846
• Calyculina Clessin, 1872
• Clessinicyclas Alimov & Starobogatov, 1968
• Cornea Megerle von Mühlfeld, 1811
• Corneocyclas J. B. Férussac, 1818
• Corneola Westerlund, 1873
• Cycladea Rafinesque, 1815
• Cycladites Krüger, 1823
• Cyclas Lamarck, 1798
• Cyclas (Amesoda) Rafinesque, 1820
• Cyclas (Cyclas) Lamarck, 1798
• Cyclas (Phymesoda) Rafinesque, 1820
• Cyclas (Securilla) Drouët, 1855
• Cyclas (Sphaerium) Scopoli, 1777
• Cyclocalyx (Sphaerinova) Iredale, 1943
• Cyclus Jurine, 1817
• Cyrena (Corneocyclas) Blainville, 1818
• Cyrena (Cyclas) Lamarck, 1798
• Cyrena (Sphaerium) Scopoli, 1777
• Musculium Link, 1807
• Musculium (Morimusculium) Starobogatov, 1986
• Musculium (Musculium) Link, 1807
• Musculium (Paramusculium) Alimov & Starobogatov, 1968
• Musculium (Parvimusculium) Starobogatov & Kornjushin, 1986
• Musculium (Patagomusculium) Starobogatov, 1986
• Musculium (Sphaerinova) Iredale, 1943
• Nucleocyclas Alimov & Starobogatov, 1968
• Nux Humphrey, 1797
• Paramusculium Alimov & Starobogatov, 1968
• Phymesoda Rafinesque, 1820
• Primella Cooper, 1892 · unaccepted
• Pseudocorbicula Dautzenberg, 1908
• Rivicoliana Servain, 1888
• Shadinicyclas Starobogatov & Korniushin, 1986
• Sphaeriastrum Bourguignat, 1854
• Sphaerinova Iredale, 1943
• Sphaerinova (Asiomusculium) Starobogatov & Korniushin, 1986
• Sphaerium (Amesoda) Rafinesque, 1820
• Sphaerium (Baicaliana) Korniushin, 1996
• Sphaerium (Corneana) Servain, 1888
• Sphaerium (Corneola) Westerlund, 1873
• Sphaerium (Cyclas) Lamarck, 1798
• Sphaerium (Cyrenastrum) Bourguignat, 1854
• Sphaerium (Herringtonium) A. H. Clarke, 1973
• Sphaerium (Lacustriana) Servain, 1888
• Sphaerium (Musculium) Link, 1807
• Sphaerium (Nucleocyclas) Alimov & Starobogatov, 1968
• Sphaerium (Pseudocorbicula) Dautzenberg, 1908
• Sphaerium (Rivicoliana) Servain, 1888
• Sphaerium (Serratisphaerium) Germain, 1909
• Sphaerium (Sibirisphaerium) Slugina & Starobogatov, 1994
• Sphaerium (Solidiana) Servain, 1888
• Sphaerium (Sphaeriastrum) Bourguignat, 1854
• Sphaerium (Sphaerinova) Iredale, 1943
• Sphaerium (Sphaerium) Scopoli, 1777
• Zecyclas Starobogatov, 1968

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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.