The lined chiton is a species of chiton from the North Pacific. It has been recorded from intertidal and subtidal waters to a depth of 30 to 90 m. T. lineata often occurs on rocks that are encrusted by coralline algae; presumably this is what their coloration is intended to camouflage against. If knocked from its substrate, T. lineata will contract into a ball in order to protect its vulnerable ventral side, similar to many isopods. Coralline algae are also the major food item of T. lineata.
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References:http://www.afsc.noaa.gov/kodiak/photo/mistonicella.htm
http://www.centralcoastbiodiversity.org/lined-chiton-bull-tonicella-lineata.html
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