Seanet Mid Intertidal

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Mopalia lignosa (Gould, 1846)
Phylum Mollusca, Class Polyplacophora, Order Chitonida, Family Mopaliidae

Large oval chiton to 70 mm long; valves smooth w. mid-dorsal ridge; gray-green w. brown or white lines; girdle narrower than M. muscosa, cream to brown (orange on underside), with sparser cover of short spines. 

Common, mostly on undersides of rocks, mid-intertidal zone to subtidal, protected outer coast.  Feeds on diatoms & a variety of green & red algae.

Geo Range: Alaska to Pt. Conception
Similar species: Mopalia muscosa is similar in shape & size, but  brown-black or purplish with denser spines on a wider girdle.