| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Aaptos Gray 1867 | 2 | 0 | 0 |
| Aaptos aaptos (Schmidt 1864) | 0 | 0 | 1 |
| Aaptos bergmanni de Laubenfels 1950 | 0 | 0 | 1 |
| Abrus | 1 | 0 | 0 |
| Abrus precatorius L. | 0 | 0 | 1 |
| Abudefduf | 1 | 0 | 0 |
| Abudefduf saxatilis (Linnaeus 1758) (Castagnole) | 0 | 0 | 1 |
| Acanthaceae | 3 | 0 | 0 |
| Acanthemblemaria | 1 | 0 | 0 |
| Acanthemblemaria spinosa Metzelaar 1919 | 0 | 0 | 1 |
| Acanthochitona Gray 1821 | 1 | 0 | 0 |
| Acanthochitona spiculosa (Reeve 1847) | 0 | 0 | 1 |
| Acanthochitonidae Pilsbry 1893 | 1 | 0 | 0 |
| Acanthopleura Guilding 1830 | 1 | 0 | 0 |
| Acanthopleura granulata (Gmelin 1791) | 0 | 0 | 1 |
