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)
Family Cassidae P.A. Latreille, 1825 - helmet snails
see Subfamily Cassinae Latreille, 1825
Genus Cassis Scopoli, 1777
Subgenus Cassis (Cassis) Scopoli, 1777