Phylum [Vertebrata] Lamarck, 1801 see Infraphylum Vertebrata Lamarck, 1801
   Class †Placodermi McCoy, 1848
     Order †Arthrodira Woodward, 1891 see [unranked] Arthrodira Woodward, 1891
       Genus †Groenlandaspis "Heintz, 1932", nom. illeg. see Genus Gronlandaspis Heintz, 1932