Phylum [Mollusca] Linnaeus, 1758 - molluscs Class Gastropoda Cuvier, 1795 - snails and slugs Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs see Class Gastropoda Cuvier, 1795 Order Archaegastropoda see Order Archaeogastropoda Thiele, 1925 Superfamily Trochacea see Superfamily Trochoidea Rafinesque, 1815 Family Trochidae Rafinesque, 1815 - top snails Subfamily Calliostomatinae Thiele, 1924 (1847) Genus Calliostoma Swainson, 1840