Uses its many transverse rows of 17 teeth capped with magnetite, with a central tooth flanked by eight marginal teeth on either side, to feed on red algae, including Gigartina, Iridaea, Plocamium, and various corallines. Individuals will also eat sea lettuce (Ulva), kelp (Macrocystis), and small Laminaria. They grow slowly and may live 20 years or more. They have few enemies: the predaceous snail, Ocenebra lurida, is the sole exception; it rasps pits 0.4 in (1 cm) in diameter and 0.11-0.15 in (3-4 mm) deep into the dorsal surface of a chiton's body, exposing the yellow flesh over the valves.
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