These large chitons are elongate, oval, carinate and moderately elevated.

They have strongly arched grey or brown valves.

The leathery girdle is greyish or brown, spotted with black and has tufts of short hairs.

[2][3] This species hides under rocks during the day but emerges at night.

This species is found around the South African coast from the Cape Peninsula to Durban, subtidally to at least 5 m.[4][5] Media related to Dinoplax gigas at Wikimedia Commons