| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Abra Lamarck 1818 | 4 | 0 | 0 |
| Abra alba (W. Wood 1802) (syndesmye blanche) | 0 | 0 | 1 |
| Abra nitida (O. F. Müller 1776) | 0 | 0 | 1 |
| Abra segmentum (Récluz 1843) | 0 | 0 | 1 |
| Abra renieri | 0 | 0 | 1 |
| Abramis (brème) | 1 | 0 | 0 |
| Abramis brama (Linnaeus 1758) (Brème commune) | 0 | 0 | 1 |
| Acanthocardia Gray 1851 | 1 | 0 | 0 |
| Acanthocardia paucicostata (G. B. Sowerby II 1834) | 0 | 0 | 1 |
| Acanthocephala | 1 | 0 | 0 |
| Acanthochitona Gray 1821 | 1 | 0 | 0 |
| Acanthochitona fascicularis (Linnaeus 1767) | 0 | 0 | 1 |
| Acanthochitonidae Pilsbry 1893 | 1 | 0 | 0 |
| Acanthoscapha | 1 | 0 | 0 |
| Pasiphaea cristata | 0 | 0 | 1 |
