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
           Family Triphoridae Gray, 1847
             1 Subfamily Triphorinae Gray, 1847
             2 Subfamily Laiocochliinae [monotypic]
             3 Subfamily Metaxiinae Marshall, 1977
             4 Subfamily Adelacerithinae Marshall, 1984 [monotypic] see Subfamily Adelacerithiinae Marshall, 1984