†Placodermi McCoy, 1848
Count: [†*] †18f;24g;25s
   †Arthrodira Woodward, 1891
  Count: [†*] †18f;24g;25s
     †Brachythoraci Gross, 1932
    Count: [†*] †18f;23g;24s
       †Eubrachythoraci Miles, 1971
      Count: [†*] †18f;20g;22s [11 May 2017]
         †Pachyosteomorphi Stensiö, 1944
        Count: [†*] †14f;17g;18s [11 May 2017]
           Superfamily †Dunkleosteoidea Stensiö, 1963
          Count: [†*] †2f;8g;11s [10 May 2017]
             Family †Dunkleosteidae Stensiö, 1963
            Count: [†*] †5g;8s [10 May 2017]
               Genus †Eastmanosteus Obruchev, 1964 [paraphyletic]
              Count: [†*] †2s
                 †Eastmanosteus pustulosus (Eastman, 1897)
                Count: -