Class Gastropoda Cuvier, 1795 - snails and slugs Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs see Class Gastropoda Cuvier, 1795 1 Order Archaeogastropoda Thiele, 1925 see Order Vetigastropoda Salvini-Plawen, 1980 2 Order Mesogastropoda Thiele, 1925 - mesogastropods see [unranked] mesogastropods