fossil marine animal genera Linnaeus, 1758 - animals
   Phylum Mollusca Linnaeus, 1758 - molluscs
     Class Gastropoda Cuvier, 1795 - snails and slugs
       01 Order †Bellerophontida Ulrich & Scofield, 1897 see Superfamily Bellerophontoidea McCoy, 1852
       02 Order Patellogastropoda Lindberg, 1986
       03 Order †Euomphalina de Koninck, 1881
       04 Order †Macluritina Cox & Knight, 1960
       05 Order Archaeogastropoda Thiele, 1925 see Order Vetigastropoda Salvini-Plawen, 1980
       06 Order Architaenoglossa Haller, 1892 see Order Architaenioglossa Haller, 1892
       07 Order Neotaenioglossa Haller, 1882 see Suborder Neotaenioglossa Haller, 1882
       08 Order Neogastropoda Wenz, 1938 see Suborder Neogastropoda Wenz, 1938
       09 Subclass Opisthobranchia Milne-Edwards, 1848 - opisthobranchs see Order Opisthobranchia Milne-Edwards, 1848
       10 Order Basommatophora Keferstein, 1865 see Suborder Basommatophora Keferstein, in Bronn, 1864
       11 Order uncertain