†Placodermi McCoy, 1848 †Arthrodira Woodward, 1891 †Brachythoraci Gross, 1932 †Eubrachythoraci Miles, 1971 †Pachyosteomorphi Stensiö, 1944 Superfamily †Dunkleosteoidea Stensiö, 1963 Family †Panxiosteidae Wang, 1979 Genus †Janiosteus Ivanov, 1988 [monotypic] 1 †Janiosteus timanicus Ivanov, 1989