coastal region of Alaska to Oregon in North America[3][4] The shell protects themselves from predators by blending their body into the environment. The special white line on T. insignis is one of the most distinguish characteristic which only exist on the second to the seventh valve.[5]
Vaught, K.C.; Tucker Abbott, R.; Boss, K.J. (1989). A classification of the living Mollusca. American Malacologists: Melbourne. ISBN 0-915826-22-4. XII, 195 pp.
Stebbins, T. D.; Eernisse, D. J. (2009). Chitons (Mollusca: Polyplacophora) known from benthic monitoring programs in the Southern California Bight. The Festivus. 41 (6): 53โ100, errata.