Phylum Chordata Bateson, 1885 - chordates Subphylum Vertebrata Cuvier, 1812 - vertebrates Class Dinosauria Owen, 1841 see Clade Dinosauria Owen 1842 [Langer, Novas, Bittencourt, Ezcurra & Gauthier 2020] Subclass †Ornithischia Seeley, 1887 see Order Ornithischia Seeley, 1887