-
-
Eumetazoa (metazoans)
-
Bilateria (bilaterally symmetrical animals)
-
Protostomia (protostomes)
-
-
-
Mollusca (clams, snails, squids, and relatives)
-
Class Gastropoda
-
Order Cephalaspidea
-
Family Aglajidae
-
Family Aplustridae
-
Family Bullidae
-
Family Bullinidae
-
Family Cylichnidae
-
Family Diaphanidae
-
Family Gastropteridae
-
Family Haminoeidae
-
Family Philinidae
-
Family Retusidae
-
Family Ringiculidae
-
Family Runcinidae
-
-
-
-
-
-
-
-
-