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 Trochidae Rafinesque, 1815 - top snails
               Subfamily Umboniinae Adams & Adams, 1854 (1840)
                 Tribe Umboniini Adams & Adams, 1854 (1840)
                   1 Genus Umbonium Link, 1807
                   2 Genus Inkaba Herbert, 1992
                   3 Genus Protorotella Makiyama, 1924
                   4 Genus Pseudominolia Herbert, 1992