†Placodermi McCoy, 1848 †Arthrodira Woodward, 1891 †Brachythoraci Gross, 1932 †Eubrachythoraci Miles, 1971 †Pachyosteomorphi Stensiö, 1944 - pachyosteomorphs Superfamily †Dunkleosteoidea Stensiö, 1963 1 Family †Dunkleosteidae Stensiö, 1963, "nom. praeval." 2 Family †Panxiosteidae Wang, 1979