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
       †Neornithischia Cooper 1985
         †Marginocephalia Sereno 1986
           †Ceratopsia Marsh 1890 see Infraorder Ceratopsia Marsh, 1890
             †Neoceratopsia Sereno 1986
               1 Genus †"Chaoyoungosaurus" Zhao & Cheng, 1983, nom. nud. see Genus Chaoyangsaurus Zhao, Cheng & Xu, 1999
               2.1 Genus †Leptoceratops Brown, 1914
               2.2 †Coronosauria Sereno 1986