Superphylum Deuterostomia Grobben, 1908 - deuterostomes see Infrakingdom Deuterostomia Grobben, 1908
   Phylum Chordata Bateson, 1885 - chordates
     Subphylum Craniata auct. see Subphylum Vertebrata Cuvier, 1812
       Vertebrata (Lamarck, 1801) - vertebrates see Subphylum Vertebrata Cuvier, 1812
         Myopterygii - myopterygians
           Superclass Gnathostomata Gegenbaur, 1874 - jawed vertebrates
             Grade †Placodermiomorphi [monotypic]
               Class †Placodermi McCoy, 1848
                 Order †Arthrodiriformes Grande & Eastman, 1986 - arthrodires
                   .1 Family †Camuropiscidae Dennis & Miles, 1979
                   .2 Family †Dinichthyidae Newberry, 1885
                   .3 Genus †Hadrosteus Gross, 1932
                   .4 Family †Mylostomatidae Woodward, 1891
                   .5 Family †Panxiosteidae Wang, 1979
                   .6 Family †Selenosteidae Dean, 1901
                   .7 Family †Titanichthyidae Dean, 1901
                   .8 Family †Wuttagoonaspidae Ritchie, 1973
                   1 Suborder †Actinolepidoidei Miles, 1973
                   2.1? Family †Antarctaspidae
                   2.2 Suborder †Phyllolepida Stensiö, 1934 [monotypic] see Suborder Phyllolepidoidei
                   3 Suborder †Phlyctaeniida
                   4 Suborder †Brachythoraci Gross, 1932