[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
                 1 Family †Phlyctaeniidae Fowler, 1947 (1929)
                 2 Family †Arctolepididae Heintz, 1937, nom. praeval.
                 3 Family †Gronlandaspididae Obruchev, 1964
                 4 Family †Arctaspididae Goujet, 1984
                 5 Family †Holonematidae Obruchev, 1932