Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs see Class Gastropoda Cuvier, 1795
       1 Superorder Archaeogastropoda Thiele, 1925
       2 Order Mesogastropoda Thiele, 1925 - mesogastropods see [unranked] mesogastropods
       3 Order Caenogastropoda Cox, 1960 see Superorder Caenogastropoda Cox, 1960
       4 Order Neogastropoda Wenz, 1938 see Suborder Neogastropoda Wenz, 1938