Dinosauria Owen 1841 [Padian & May 1993], nom. cl. inval. see Clade Dinosauria Owen 1842 [Langer, Novas, Bittencourt, Ezcurra & Gauthier 2020]
   †Ornithischia Seeley 1887 [Padian & May 1993] see Order Ornithischia Seeley, 1887
     †Genasauria Sereno 1986
       †Thyreophora Nopcsa 1915 see Suborder Thyreophora Nopcsa, 1915
         †Eurypoda Sereno 1986
           †Stegosauria Marsh 1877 see Infraorder Stegosauria Marsh, 1877
             1 Genus †Huayangosaurus Dong, Tang & Zhou, 1982
             2 †Stegosauridae Marsh 1880 see Family Stegosauridae Marsh, 1880