Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Mollusca Linnaeus, 1758 - molluscs
           Subphylum Conchifera Gegenbauer, 1878
             Order Monotocardia
               Suborder Taenioglossa see Order Mesogastropoda Thiele, 1925
                 Superfamily Tonnoidea Suter, 1913 (1825)
                   1 Family Oocorythidae see Subfamily Oocorythinae Fischer, 1885
                   2 Family Cassidae P.A. Latreille, 1825 - helmet snails see Subfamily Cassinae Latreille, 1825
                   3 Family Cymatiidae Iredale, 1913 see Family Ranellidae Gray, 1854
                   4 Family Bursidae Thiele, 1925 - frog snails
                   5 Family Tonnidae Suter, 1913 (1825) - tuns