†Placodermi McCoy, 1848 †Arthrodira Woodward, 1891 †Brachythoraci Gross, 1932 †Eubrachythoraci Miles, 1971 †Pachyosteomorphi Stensiö, 1944 †Dunkleosteoidea Stensiö, 1963 †Panxiosteidae Wang, 1979 †Panxiosteus ocullus Wang, 1979