Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs see Class Gastropoda Cuvier, 1795
       Superorder Archaeogastropoda Thiele, 1925
         Order Vetigastropoda Salvini-Plawen, 1980 - archaeogastropods s.l.
           Superfamily Trochoidea Rafinesque, 1815
             Family Turbinidae Rafinesque, 1815 - turban snails
               Subfamily Colloniinae Cossmann, 1917
                 Genus Homalopoma Carpenter, 1864
                   1 Subgenus Homalopoma Carpenter, 1864
                   2 Subgenus Argalista Iredale, 1915
                   3 Subgenus Panocochlea Dall, 1908
                   4 Subgenus Leptothyropsis Woodring, 1928
                   5 Subgenus Leptocollonia Powell, 1951