Classification
Animalia [kingdom]Mollusca [phylum]
Gastropoda [class]
Opisthobranchia [subclass]
Cephalaspidea [order]
Ordo Cephalaspidea bevat de volgende taxa:
Acteonidae [family]
Cylichnidae [family]
Diaphanidae [family]
Philinidae [family]
Retusidae [family]
Runcinidae [family]