†Placodermi McCoy, 1848
   †Arthrodira Woodward, 1891
     †Brachythoraci Gross, 1932
       †Eubrachythoraci Miles, 1971
         †Pachyosteomorphi Stensiö, 1944 - pachyosteomorphs
           Superfamily †Dunkleosteoidea Stensiö, 1963
             Family †Dunkleosteidae Stensiö, 1963, "nom. praeval."
               Genus †Eastmanosteus Obruchev, 1964 [paraphyletic]
                 †Eastmanosteus calliaspis Dennis-Bryan, 1987