Order: Cephalaspidea
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Opisthobranchia |
| Order: | Cephalaspidea |
Species Under: Order Cephalaspidea
Sub-structure
- Family: Aglajidae
- Family: Aplustridae
- Family: Bullidae
- Family: Bullinidae
- Family: Diaphanidae
- Family: Gastropteridae
- Family: Haminoeidae
- Family: Philinidae