[Phylum] Chordata Bateson, 1885 - chordates
   Subphylum Craniata auct.
     Infraphylum Vertebrata Lamarck, 1801 - vertebrates
       Superclass Gnathostomata Gegenbaur, 1874 - jawed vertebrates
         Class †Placodermi McCoy, 1848
           †Arthrodira Woodward, 1891
             Order †Phlyctaeniiformes
               Suborder †Phlyctaenioidei
                 Family †Gronlandaspididae Obruchev, 1964
                   1 Genus †Gronlandaspis Heintz, 1932
                   2 Genus †Tiaraspis Gross, 1962