| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Callipallenidae | 1 | 0 | 0 |
| Candidae d'Orbigny 1851 | 1 | 0 | 0 |
| Carditidae Férussac 1822 | 1 | 0 | 0 |
| Carditoida | 0 | 0 | 0 |
| Cellaria Ellis & Solander 1786 | 1 | 0 | 0 |
| Cellaria diversa Livingstone 1928 | 0 | 0 | 1 |
| Cellariidae Fleming 1828 | 1 | 0 | 0 |
| Celleporella Gray 1848 | 1 | 0 | 0 |
| Celleporella alia Hayward 1993 | 0 | 0 | 1 |
| Cephaloziella (Spruce) Schiffn. | 1 | 0 | 0 |
| Cephaloziella varians (Gottsche) Steph. | 0 | 0 | 1 |
| Cephaloziellaceae | 1 | 0 | 0 |
| Cheilostomatida Busk 1852 | 9 | 0 | 0 |
| Chiloscyphus Corda | 1 | 0 | 0 |
| Chiloscyphus dissitifolia | 0 | 0 | 1 |
