Tags: Crustacean.
Chamaesipho is a genus of four-plated notochthamaline barnacles in the Pacific Ocean limited to Australia/New Zealand temperate waters. They are intertidal in preference and tend to form crowded columnar colonies. They can be identified in the field by having four plated wall unfused rostrum and narrow opercular plates. Elminius which also inhabits the same area has four plates in its shell wall.