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 Neotaenioglossa Haller, 1882 see Order Sorbeoconcha Ponder & Lindberg, 1997
           Superfamily Cassoidea Latreille, 1825
             1 Family Tonnidae Suter, 1913 (1825) - tuns
             2 Family Ficidae Meek, 1864 (1840) - fig snails
             3 Family Cassidae P.A. Latreille, 1825 - helmet snails see Subfamily Cassinae Latreille, 1825
             4 Family Laubierinidae Warén & Bouchet, 1990 [monotypic]
             5 Family Ranellidae Gray, 1854 - tritons
             6 Family Personidae Gray, 1854
             7 Family Bursidae Thiele, 1925 - frog snails