†Placodermi McCoy, 1848
   †Arthrodira Woodward, 1891
     †Brachythoraci Gross, 1932
       †Eubrachythoraci Miles, 1971
         †Pachyosteomorphi Stensiö, 1944 - pachyosteomorphs
           Superfamily †Dunkleosteoidea Stensiö, 1963
             Family †Panxiosteidae Wang, 1979
               1 Genus †Panxiosteus Wang, 1979 [monotypic]
               2 Genus †Janiosteus Ivanov, 1988 [monotypic]
               3 ?Genus †Plourdosteus Ørvig, 1951