Sphaeriidae is a family of small to minute freshwater bivalve molluscs in the order Sphaeriida. In the US, they are commonly known as pea clams or fingernail clams.

Genera

Genera:

Euperinae

• Byssanodonta d'Orbigny, 1846

• Eupera Bourguignat, 1854

Sphaeriinae

• Afropisidium Kuiper, 1962

• Euglesa Jenyns, 1832

• Musculium Link, 1807

• Odhneripisidium Kuiper, 1962

• Pisidium C. Pfeiffer, 1821

• Sphaerium Scopoli, 1777

fossils

• †Megasphaerioides Komatsu, J.-H. Chen & Q.-F. Wang, 2003

• †Protosphaerium Hocknull, 2000

• †Sphaericoncha Kolesnikov, 1980

Biology and ecology

Sphaeriidae are hermaphrodites with internal fertilization. Developing young are incubated within their mother (ovoviviparity), and newborn clams look like miniature copies of the adults.

Parasites and/or predators include the Sciomyzidae.

References