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 Triforidae Jousseaume, 1884 see Family Triphoridae Gray, 1847
             Subfamily Triforinae Jousseaume, 1884 [monotypic]
               Genus †Triforis Deshayes, 1834
                 Subgenus Granulotriforis Kosuge, 1967