†Placodermi McCoy, 1848 †Arthrodira Woodward, 1891 †Brachythoraci Gross, 1932 †Eubrachythoraci Miles, 1971 †Pachyosteomorphi Stensiö, 1944 Superfamily †Dunkleosteoidea Stensiö, 1963 Family †Dunkleosteidae Stensiö, 1963 Genus †Dunkleosteus Lehman, 1956 †Dunkleosteus terrelli (Newberry, 1873)