Mollusca Linnaeus, 1758 - molluscs see Phylum Mollusca Linnaeus, 1758
   Gastropoda Cuvier, 1795 see Class Gastropoda Cuvier, 1795
     Clade Heterobranchia Burmeister, 1837 see Superorder Heterobranchia Burmeister, 1837
       Informal Group Opisthobranchia Milne-Edwards, 1846 see Order Opisthobranchia Milne-Edwards, 1848
         Clade Gymnosomata Blainville, 1824 see Suborder Gymnosomata Blainville, 1824
           Superfamily Clionoidea Rafinesque, 1815
             1 Family Clionidae Rafinesque, 1815
             2 Family Cliopsidae Costa, 1873
             3 Family Notobranchaeidae Pelseneer, 1886
             4 Family Pneumodermatidae Latreille, 1825