Phylum [Mollusca] Linnaeus, 1758 - molluscs
Count: -
   Class Gastropoda Cuvier, 1795 - snails and slugs
  Count: -
     Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs see Class Gastropoda Cuvier, 1795
    Count: [g†g] 4o;64f;261g; †1g
       Order Mesogastropoda Thiele, 1925 - mesogastropods see [unranked] mesogastropods
      Count: [g] 29f;82g
         Suborder Taenioglossa see Order Mesogastropoda Thiele, 1925
        Count: [g] 27f;75g
           Superfamily Tonnacea Suter, 1913 see Superfamily Tonnoidea Suter, 1913 (1825)
          Count: [g] 5f;17g
             Family Cassidae P.A. Latreille, 1825 - helmet snails see Subfamily Cassinae Latreille, 1825
            Count: [g] 5g
               Genus Cassis Scopoli, 1777
              Count: -
                 1 Subgenus Cassis (Cassis) Scopoli, 1777
                Count: -
                 2 Subgenus Cassis (Cypraecassis) Stutchburry, 1837
                Count: -