OutgroupAnthracosauroideaeSeymouriamorphaSolenodonsaurusDiadectomorphaSynapsidaPareiasauriaMesosauridaeMillerettidaeProcolophoniaCaptorhinidaeTestudinesPaleothyrisAraeoscelidiaSauriaOsteologyMaximum ParsimonyBased on reanalysis of the original matrix.Gauthier_etal_1988b