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 Skeneidae Clark, 1851 see Subfamily Skeneinae Clark, 1851
               Subfamily Planitrochinae Knight, 1956 see Family Planitrochidae Knight, 1956
                 1 Genus Planitrochus Perner, 1903
                 2 Genus Chrysotoma Millard, 1996, orth. inval. see Genus Chrysostoma Swainson, 1840