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.
           1 Superfamily Fissurelloidea Fleming, 1822 [monotypic]
           2 Superfamily Scissurelloidea Gray, 1847
           3 Superfamily Pleurotomarioidea Swainson, 1840 [monotypic]
           4 Superfamily Seguenzioidea Verrill, 1884 [monotypic]
           5 Superfamily Trochoidea Rafinesque, 1815
           6 Suborder Neritopsina Cox, 1960 see Order Neritopsina Cox & Knight, 1960