THYREOPHORAMARGINOCEPHALIAHETERODONTOSAURIDAEHYPSILOPHODONTOSAURIDAEMuttaburrasaurusTenontosaurusDRYOSAURIDAECAMPTOSAURIDAEProbactrosaurusIGUANODONTIDAEOuranosaurusProtohadrosHADROSAURINAELAMBEOSAURINAEOsteologyMaximum ParsimonyBased on reanalysis of the original matrix.Sereno_1999ac