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" Chao 2.1 Genus †Leptoceratops Brown, 1914 2.2 †Coronosauria Sereno 1986