Blue Green Chiton

Chiton glaucus

Chiton glaucus is an oval-shaped chiton characterized by a distinct ridge running along its back, exhibiting bilateral symmetry. It typically measures between 30 and 35 mm in length, with some individuals reaching up to 55 mm. The shell consists of eight overlapping valves, surrounded by a girdle covered in large scales. While the common coloration is green, variations can include brown, buff, and light blue, particularly in northern New Zealand. Lighter chevron or zigzag markings may also be present. Chiton glaucus is found in the intertidal and subtidal zones, primarily inhabiting rocky substrates and tide pools across New Zealand, Tasmania, and estuarine environments, typically at depths shallower than 40 m. They often seek shelter under stones and bivalve shells during the day to avoid predators, such as oystercatchers and various fish species. At night, they emerge to graze on algae, primarily coralline algae, as well as other encrusting organisms and diatoms. Breeding habits are not well-documented, but spawning is believed to occur synchronously, often correlating with lunar cycles. The species has not been evaluated by the IUCN.