Vertebrata Cuvier, 1812 - vertebrates
   Gnathostomata
     Class †Placodermi McCoy, 1848
       Order †Arthrodira Woodward, 1891 see Order Arthrodiriformes Grande & Eastman, 1986
         Suborder †Brachythoraci Gross, 1932
           Superfamily †Coccosteoidea Traquair, 1888
             1 Family †Gemuendenaspidae Miles, 1962
             2 Family †Coccosteidae Traquair, 1888
             3 Family †Camuropiscidae Dennis & Miles, 1979
             4 Family †Pholidosteidae Gross, 1932
             5 Family †Incisoscutidae Denison, 1984