Their surfaces have ridged and grooved materials that deflect around obstacles. The whorls are smooth, often polished and spirally ridged or granular. The stipe is slender, glabrous, and longitudinally furrowed or ridged. It has a knobbly, ridged back and three large bony tubercles on each flank. Their horns are scimitar-shaped and heavily ridged. The surface of the horn was ridged, and the ridges developing progressively with age. The egg is ridged and dome-shaped. As the plants age, the bark becomes bluish-purple, ridged and furrowed. In some places, this is accomplished by constructing stacks with a conical or ridged top. Only the males have horns, which are lyre-shaped, strongly ridged and divergent. The white operculum has heavily ridged walls. It is finely granular overall, somewhat ridged, generally about long by thick. The horns, strongly ridged and divergent, are circular in section and hollow at the base. Iron-deficiency anemia can lead to a pale color along with a thin, brittle, ridged texture. Rams are all horned; these horns are typically ridged and spiraled.