| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Abra Lamarck 1818 | 7 | 0 | 0 |
| Abra aequalis (Say 1822) | 0 | 0 | 2 |
| Abra braziliensis (E. A. Smith 1885) | 0 | 0 | 2 |
| Abra californica Knudsen 1970 | 0 | 0 | 2 |
| Abra lioica (Dall 1881) | 0 | 0 | 2 |
| Abra longicallus (Scacchi 1835) | 0 | 0 | 2 |
| Abra profundorum (E. A. Smith 1885) | 0 | 0 | 2 |
| Abra uruguayensis (Pilsbry 1897) | 0 | 0 | 2 |
| Acar Gray 1857 | 3 | 0 | 0 |
| Acar bailyi Bartsch 1931 | 0 | 0 | 2 |
| Acar domingensis | 0 | 0 | 2 |
| Acar transmar Simone 2009 | 0 | 0 | 2 |
| Acesta H. Adams & A. Adams 1858 | 4 | 0 | 0 |
| Acesta bullisi (H. E. Vokes 1963) | 0 | 0 | 2 |
| Acesta excavata (Fabricius 1779) | 0 | 0 | 2 |
