(Heterodontosaurus_tucki,(Hypsilophodon_foxii,(Protoceratops_andrewsi,(((Psittacosaurus_sp,(P_mongoliensis,P_meileyingensis),(P_xinjiangensis,P_mazongshanensis)),(P_neimongoliensis,P_ordosensis)),(P_sinensis,P_sibiricus)))));