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
         Superfamily Rissooidea Gray, 1847
           Family Rastodentidae Ponder, 1966
             1 Genus Rastodens Ponder, 1966
             2 Genus Tridentifera Ponder, 1966
             3 Genus Cythnia Carpenter, 1864
             4 Genus Zerotula Finlay, 1926