ORNITHOPODACERATOPSIDAEStenopelixWannanosaurusGoyocephaleHomalocephaleStegocerasColepiocephaleTylocephalePrenocephale_prenesPrenocephale_goodwiniPrenocephale_brevisPrenocephale_edmontonensisHanssuesiaStygimolochPachycephalosaurusOsteologyMaximum ParsimonyBased on reanalysis of the original matrix.Schott_etal_2009aa