Phylum Mollusca Linnaeus, 1758 - molluscs Count: - Class Gastropoda Cuvier, 1795 - snails and slugs Count: - Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs see Class Gastropoda Cuvier, 1795 Count: - Order Mesogastropoda Thiele, 1925 - mesogastropods see [unranked] mesogastropods Count: - Superfamily Heteropoda Lamarck, 1812 see Superfamily Pterotracheoidea Rafinesque, 1814 Count: -