Phylum [Mollusca] Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Opisthobranchia Milne-Edwards, 1848 - opisthobranchs see Order Opisthobranchia Milne-Edwards, 1848
       Order Cephalaspidea Fischer, 1883
         Superfamily Acteonacea d'Orbigny, 1835 see Superfamily Acteonoidea d'Orbigny, 1843
           1 Family Acteonidae d'Orbigny, 1843, nom. protect. - bubble shells
           2 Family Aplustridae Gray, 1847