[Phylum] Chordata Bateson, 1885 - chordates
   Subphylum Craniata auct.
     Infraphylum Vertebrata Lamarck, 1801 - vertebrates
       Superclass †Osteostracomorphi
         Class †Osteostraci Lankester, 1868
           Order †Cephalaspidiformes Halstead Tarlo, 1967
             Suborder †Ateleaspidoidei
               1 Family †Ateleaspididae Traquair, 1899, nom. praeval.
               2 Family †Kalanaspididae Tinn & Märss, 2018