| image = Ornithopods jconway.jpg | image_width = 200px | image_caption = Ornithopods and a Hypsilophodontid | regnum = Animalia | phylum = Chordata | classis = Reptilia | superordo = Dinosauria | ordo = †Ornithischia | subordo = †Cerapoda | subordo_authority = Sereno, 1986 | subdivision_ranks = Infraorders | subdivision = †Ceratopsia †Ornithopoda †Pachycephalosauria }} Cerapoda 's a clade or suborder of the order Ornithischia. They're the sister group of the T… (More on Cerapoda)