Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Cephalopoda Cuvier, 1795 - cephalopods
     Subclass Coleoida Bather, 1888 see Subclass Coleoidea Bather, 1888
       1 Order Belemnitida Gray, 1849
       2 Order Sepiida Gray, 1849
       3 Order Teuthida Naef, 1916
       4 Order Vampyromorpha Grimpe, 1917 [monotypic] - vampire squids see Order Vampyromorphida Pickford, 1939
       5 Order Octopoda Leach, 1817 - octopuses