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
                 †Cornuata
                   1 Family †Benneviaspidae
                   2 Family †Cephalaspidae
                   3 Family †Dartmuthiidae
                   4 Family †Kiaeraspidae
                   5 Family †Sclerodidae
                   6 Family †Thyestiidae nom. imperf. see Family Thyestidae
                   7 Family †Tremataspidae
                   8 Family †Zenaspidae