Superphylum Deuterostomia Grobben, 1908 - deuterostomes see Infrakingdom Deuterostomia Grobben, 1908
   Phylum Chordata Bateson, 1885 - chordates
     Subphylum Craniata auct.
       Vertebrata Lamarck, 1801 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
         Myopterygii Janvier, 1978 - myopterygians
           Superclass †Osteostracomorphi [monotypic]
             Class †Cephalaspidomorphi Kiaer & Stensiö, 1920 see Class Osteostraci Lankester, 1868
               Order †Cephalaspidiformes Halstead Tarlo, 1967
                 .1 Genus †Boreaspis Stensiö, 1927
                 .2 Genus †Waengsjoeaspis Janvier, 1985
                 .3 Genus †Superciliaspis Adrain & Wilson, 1994
                 1 Genus †Ateleaspis Traquair, 1899
                 2 Genus †Hirella Cossmann, 1920
                 3 Genus †Hemicyclaspis Lankester, 1870
                 4 †Cornuata