| Crassatella Lamarck, 1799 |
| Crassatella antillarum Reeve, 1842 |
| Crassatella gibbosa G. B. Sowerby I, 1832 |
| Crassatella martinicensis d'Orbigny, 1853 |
| Crassatella speciosa A. Adams, 1854 |
| Crassatellidae Férussac, 1822 |
| Crassatellinae Férussac, 1822 |
| Crassatellites Krüger, 1823 |
| Crassatellites duplinianus Dall, 1903 |
| Crassinella Guppy, 1874 |
| Crassinella adamsi Olsson, 1961 |
| Crassinella coxa Olsson, 1964 |
| Crassinella dupliniana (Dall, 1903) |
| Crassinella ecuadoriana Olsson, 1961 |
| Crassinella lunulata (Conrad, 1834) |
| Crassinella martinicensis (d'Orbigny, 1853) |
| Crassinella mexicana Pilsbry & Lowe, 1932 |
| Crassinella nuculiformis Berry, 1940 |
| Crassinella pacifica (C. B. Adams, 1852) |
| Crassinella skoglundae Coan, 1979 |