The outgrouptaxainclude the basal ornithischians Lesothosaurus, Heterodontosaurus, and Agilisaurus, the non-iguanodontian ornithopods Haya, Orodromeus and Jeholosaurus, and the pachycephalosauriansWannanosaurus, Goyocephale, Homalocephale and Stegoceras.