Phylum Mollusca Linnaeus, 1758 - molluscs Class Gastropoda Cuvier, 1795 - snails and slugs Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs see Class Gastropoda Cuvier, 1795 Superorder Archaeogastropoda Thiele, 1925 Order Vetigastropoda Salvini-Plawen, 1980 - archaeogastropods s.l. Superfamily Pleurotomarioidea Swainson, 1840 [monotypic] 1 Family Pleurotomariidae Swainson, 1840 - slit snails