Largest chiton in the world, reaching 13 in (33 cm) in length and 5 in (13 cm) in width. Has the general appearance of a wandering "meatloaf." It is distinguished both by its size and its brick-red colored, leathery mantle, which extends up and over the shell valves, obscuring them from sight. The mantle is covered with closely spaced fascicles of very short, spreading spines, or spicules. The white, butterfly-shaped shell valves are hard and frequently wash up on beaches intact.
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