Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs see Class Gastropoda Cuvier, 1795
       Order Neogastropoda Wenz, 1938 see Suborder Neogastropoda Wenz, 1938
         Suborder Stenoglossa Bouvier, 1887
           Superfamily Cancellarioidea Forbes & Hanley, 1851 [monotypic]
             Family Cancellariidae Forbes & Hanley, 1851 - nutmeg snails
               Subfamily Plesiotritoninae Beu & Maxwell, 1987
                 1 Genus †Plesiotriton Fischer, 1884
                 2 Genus Africotriton Beu & Maxwell, 1987
                 3 Genus Tritonoharpa Dall, 1908
                 4 Genus †Turehua Marwick, 1943
                 5 Genus †Varicohilda Eames, 1957
                 6 Genus †Kapuatriton Beu & Maxwell, 1987
                 7 Genus †Loxotaphrus Harris, 1897