About Tonicella undocaerulea Sirenko, 1973
Tonicella undocaerulea, commonly known as the blue-lined chiton, has a distinct head plate marked with zigzagging white concentric lines. These lines may appear blue when the chiton is alive, and the head plate has no dark border. Living, vibrant blue-lined chitons often display bright electric blue stripes and specks across their bodies. The chiton's girdle is usually hairless, with coloration ranging from brown to red or pink, and it often has yellow or white mottling. This species is found along the Pacific coast of North America, with a natural range extending from Kodiak, Alaska down to Point Conception, California. It most commonly occurs on rocks in low intertidal and shallow subtidal waters.
