A large, broadly oval chiton, up to 4 cm in length. The shell plates are smooth and glossy, reddish brown in colour with variable white or pale brown marbling. Girdle broad, thin and leathery, reddish-brown with a fringe of tiny, flattened spines (red, green or purple in colour, sometimes banded). The mantle has 17-26 pairs of gills, usually in the posterior region of the mantle groove but occasionally distributed throughout the entire groove.A detailed key to the chitons is provided by Jones & Baxter (1987).
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