Hartweg's Chiton

Cyanoplax hartwegii

Cyanoplax hartwegii is a small chiton that can reach a length of about 30.8 millimetres. It is characterized by its red-brown body and dark gray girdle. The surface of its valves typically appears grayish green with darker markings, which can help distinguish it from similar species. The chiton's surface is smooth but microscopically granulated, featuring scattered wart-like granules, particularly on the lateral areas. This unique morphology aids divers in identifying it during underwater encounters. This species is found in the Eastern Pacific, specifically in regions such as Alaska, Mexico, and the USA. Hartweg's Chiton inhabits intertidal to shallow subtidal zones, often residing at mid-tide marks along rocky shores, such as those found in southern California. It is typically encountered at depths shallower than 40 meters, with most records indicating a preference for depths around 10 meters or less. Reproduction in Cyanoplax hartwegii involves a life cycle where eggs hatch into planktonic trocophore larvae, which later settle on the ocean floor as young adults. This species is primarily herbivorous, feeding on algae and organic matter found in its environment. Divers may observe them grazing on the substrate, often camouflaged against the rocky surfaces they inhabit. The conservation status of Hartweg's Chiton has not been evaluated by the IUCN, indicating a lack of specific data regarding its population trends.