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 Pleurotomariacea see Superfamily Pleurotomarioidea Swainson, 1840 Family Pleurotomariidae Swainson, 1840 - slit snails 1 Genus †Pleurotomaria Defrance, 1826 2 Genus Perotrochus Fischer, 1885