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 <small>d'Orbigny, 1846</small>
- Eupera <small>Bourguignat, 1854</small>
- Sphaeriinae
- Afropisidium <small>Kuiper, 1962</small>
- Euglesa <small>Jenyns, 1832</small>
- Musculium <small>Link, 1807</small>
- Odhneripisidium <small>Kuiper, 1962</small>
- Pisidium <small>C. Pfeiffer, 1821</small>
- Sphaerium <small>Scopoli, 1777</small>
- fossils
- â Megasphaerioides <small>Komatsu, J.-H. Chen & Q.-F. Wang, 2003</small>
- â Protosphaerium <small>Hocknull, 2000</small>
- â Sphaericoncha <small>Kolesnikov, 1980</small>
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