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
                 †Cornuata
                   Family †Zenaspidae Nelson, 2006, nom. illeg. see Family Zenaspididae Stensiö, 1958