These large chitons have carinate plates with strongs ribs. It has style branch which have a yellow carinate (ridge). The sternum is large, carinate, and broad. Supraorbital ridge with a row of large, carinate scales. There is a supraorbital ridge with a row of large, carinate scales. The protoconch can be smooth or very carinate. It is conoid-lenticular, rather solid, acutely carinate. The foot or the base may be bulbous, flat, carinate, or another shape. The whorls are slightly channeled, carinate and striate. The sculpture of the shell is often carinate or costate. The upper ones are spirally sulcate or carinate. The hind femora are incrassate, with a carinate mesoventral margin. The seeds are cylindric and not carinate. The upper ones are carinate and tuberculate or spinose at the periphery. It has lanceolate, acuminate, carinate spathes (leaves of the flower bud).