Superphylum Deuterostomia Grobben, 1908 - deuterostomes see Infrakingdom Deuterostomia Grobben, 1908
   Phylum Chordata Bateson, 1885 - chordates
     Subphylum Craniata auct.
       Infraphylum Vertebrata Lamarck, 1801 - vertebrates
         Superclass †Osteostracomorphi [monotypic]
           Class †Cephalaspidomorphi Kiaer & Stensiö, 1920 see Class Osteostraci Lankester, 1868
             Order †Cephalaspidiformes Halstead Tarlo, 1967
               †Cornuata
                 Family †Thyestiidae nom. imperf. see Family Thyestidae Rohon, 1892