Class †Placodermi McCoy, 1848
   Order †Arthrodira Woodward, 1891 see [unranked] Arthrodira Woodward, 1891
     Genus †Yinosteus "Wang & Wang, 1984", orth. inval. see Genus Yinostius Wang & Wang, 1984
       1 †Yinosteus major "Wang & Wang, 1984", comb. inval. see Yinostius major Wang & Wang, 1984