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The Black Katy chiton is an eight plated, oval shaped mollusk that is about 2 inches long (5 cm). The shiny plates give it articulated movement allowing it to move across uneven surfaces, usually rocks.
Spotted on an exposed rock at low tide. Tongue Point. Mopalia muscosa is an inter-tidal species.
Range is Alaska to Baha California. This species is protected in the USA under the Coastal Zone Management Act.