| Phylum: | MOLLUSCA | |
| Classe: | GASTROPODA | Cuvier, 1797 |
| Ordine: | BULLOMORPHA | Pelseneer, 1906 |
| ACTEONOIDEA | D`Orbigny, 1842 | DIAPHANOIDEA | Odhner, 1922 |
| RETUSOIDEA | Thiele, 1926 | RINGICULOIDEA | xxxxxx |
| BULLOIDEA | Rafinesque, 1815 | ATYOIDEA | Thiele, 1926 |
| PHILINOIDEA | xxxxxx |