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
     1 Genus †Pisanosaurus Casamiquela, 1967
     2.1 Genus †Lesothosaurus Galton, 1978
     2.2 †Genasauria Sereno 1986