Families
1
Arbaciidae
26
Arcidae
2
Busyconidae
2
Cancellariidae
2
Cassidulidae
1
Cerithiidae
1
Columbellidae
6
Drillidae
1
Echinofulguridae
4
Faviidae
1
Lingulidae
1
Mangeliidae
1
Meandrinidae
3
Mellitidae
2
Muricidae
1
Ocypodidae
1
Phacopidae
3
Pseudomelatomidae
2
Raphitomidae
1
Rhizangiidae
1
Scaphitidae
1
Semelidae
1
Siderastreidae
1
Toxopneustidae