Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs see Class Gastropoda Cuvier, 1795
       Order Caenogastropoda Cox, 1960 see Superorder Caenogastropoda Cox, 1960
         Suborder Ptenoglossa Gray, 1853 see Infraorder Ptenoglossa Gray, 1853
           Superfamily Janthinoidea Lamarck, 1822 see Superfamily Epitonioidea Berry, 1910 (1812)
             Family Epitoniidae Berry, 1910 (1812) - wentletraps
               1 Subfamily Epitoniinae Berry, 1910 (1812) see Family Epitoniidae Berry, 1910 (1812)
               2 Subfamily Nystiellinae Clench & Turner, 1952 see Family Nystiellidae Clench & Turner, 1952