Superphylum Deuterostomia Grobben, 1908 - deuterostomes see Infrakingdom Deuterostomia Grobben, 1908
   Phylum Chordata Bateson, 1885 - chordates
     Subphylum Craniata auct. see Subphylum Vertebrata Cuvier, 1812
       Vertebrata (Lamarck, 1801) - vertebrates see Subphylum Vertebrata Cuvier, 1812
         Myopterygii - myopterygians
           Superclass †Osteostracomorphi [monotypic]
             Class †Cephalaspidomorphi Moy-Thomas & Mile, 1971
               Order †Cephalaspidiformes
                 .1 Genus †Boreaspis Stensiö, 1927
                 .2 Genus †Waengsjoeaspis Janvier, 1985
                 .3 Genus †Superciliaspis Adra & Wi, 1994
                 1 Genus †Ateleaspis Traquair, 1899
                 2 Genus †Hirella Cossmann, 1920
                 3 Genus †Hemicyclaspis Lankester, 1870
                 4 †Cornuata