Alex Mustard / Blue lined chiton (Tonicella undocaerulea) on pink calcarious algae. Browning Pass, Port Hardy, Vancouver Island, British Columbia, Canada. North East Pacific Ocean.

Norbert Wu / Blue-lined Chiton (Tonicella undocaerulea) pair use their radula to scrape food from substrate, Alaska

Norbert Wu / Blue-lined Chiton (Tonicella undocaerulea) uses its radula to scrape food from substrate, Alaska

Alex Mustard / Colourful patterns of a Blue-line chiton (Tonicella undocaerulea). Browning Pass, Port Hardy, Vancouver Island, British Columbia, Canada. Queen Charlotte Strait, North East Pacific Ocean.

David Hall / Blue-lined Chiton (Tonicella undocaerulea) Queen Charlotte Strait, British Columbia, Canada. September.

David Fleetham / Blue line chiton (Tonicella undocaerulea) on the West Coast from California to Alaska, British Columbia, Canada.