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 Fissurellacea Fleming, 1822 see Superfamily Fissurelloidea Fleming, 1822 1 Family Fissurellidae Fleming, 1822 - keyhole limpets