(Yinlong,(Stenopelix,(Wannanosaurus,(Goyocephale,(Homalocephale,(Stegoceras_validum,S_novomexicanum,Colepiocephale,(Hanssuesia,(Tylocephale,Prenocephale_prenes,(P_goodwini,Amtocephale,(P_brevis,P_edmontonensis))),(Stygimoloch,Dracorex_plus_Sandy_Site_pachy,Pachycephalosaurus))))))));