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 Architaenioglossa Haller, 1890
           Superfamily Cerithioidea Fleming, 1822
             Family Planaxidae Gray, 1850
               1 Genus Planaxis Lamarck, 1822
               2 Genus Angiola Dall, 1926
               3 Genus Fissilabia Macgillivray, 1836
               4 Genus Hinea Gray, 1847
               5 Genus Holcostoma Adams & Adams, 1853
               6 Genus Leioplanaxis Lozouet & Maestrati, 1994
               7 Genus Orthochilus Cossmann, 1889
               8 Genus Supplanaxis Thiele, 1929