†Placodermi McCoy, 1848 †Arthrodira Woodward, 1891 †Brachythoraci Gross, 1932 †Eubrachythoraci Miles, 1971 †Pachyosteomorphi Stensiö, 1944 †Aspinothoracidi Stensiö, 1959 Genus †Gorgonichthys Claypole, 1892 [monotypic] 1 †Gorgonichthys clarki Claypole, 1892