Phylum [Mollusca] Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs see Class Gastropoda Cuvier, 1795
       Order Mesogastropoda Thiele, 1925 - mesogastropods see [unranked] mesogastropods
         Suborder Taenioglossa see Order Mesogastropoda Thiele, 1925
           Superfamily Tonnacea Suter, 1913 see Superfamily Tonnoidea Suter, 1913 (1825)
             1 Family Tonnidae Suter, 1913 (1825) - tuns
             2 Family Cassidae P.A. Latreille, 1825 - helmet snails see Subfamily Cassinae Latreille, 1825
             3 Family Ficidae Meek, 1864 (1840) - fig snails
             4 Family Cymatiidae Iredale, 1913 see Family Ranellidae Gray, 1854
             5 Family Bursidae Thiele, 1925 - frog snails