Phylum Mollusca Linnaeus, 1758 - molluscs
   Subphylum Conchifera Gegenbauer, 1878
     Class Gastropoda Cuvier, 1795 - snails and slugs
       Subclass Orthogastropoda Ponder & Lindberg, 1995
         Superorder Heterobranchia Burmeister, 1837
           Order Opisthobranchia Milne-Edwards, 1848
             Suborder Cephalaspidea Fischer, 1883 - bubble snails see Order Cephalaspidea Fischer, 1883
               Superfamily Acteonoidea d'Orbigny, 1843
                 1 Family Acteonidae d'Orbigny, 1843, nom. protect. - bubble shells
                 2 Family Bullinidae Gray, 1850
                 3 Family Hydatinidae Pilsbry, 1895, nom. illeg. see Family Aplustridae Gray, 1847