(Psittacosaurus_spp,(Thescelosaurus_neglectus,(Texacephale_langstoni,Hanssuesia_sternbergi,(Stegoceras_validum,(Colepiocephale_lambei,Gravitholus_albertae)),(Sphaerotholus_brevis,(Sphaerotholus_goodwini,(Sphaerotholus_edmontonense,Sphaerotholus_buchholtzae)),((Alaskacephale_gangloffi,(Pachycephalosaurus_wyomingensis,(Stygimoloch_spinifer,Dracorex_hogwartsi))),(Prenocephale_prenes,Tylocephale_gilmorei,(Homalocephale_calathocercos,Goyocephale_lattimorei,Wannanosaurus_yansiensis)))))));