Phylum [Mollusca] Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs see Class Gastropoda Cuvier, 1795
       Order Archaegastropoda see Order Archaeogastropoda Thiele, 1925
         Superfamily Trochacea see Superfamily Trochoidea Rafinesque, 1815
           Family Trochidae Rafinesque, 1815 - top snails
             Subfamily Umboniinae Adams & Adams, 1854 (1840)
               1 Genus Ethminolia Iredale, 1924
               2 Genus Monilea Swainson, 1840
               3 Genus Umbonium Link, 1807