This barnacle has a rostrum which overlaps the adjacent plates, the tips of the terga do not form a beak, its wall plates have internal tubes, the exterior surface of the scutum is somewhat concave (see photo above), the spur of the tergum is wider than long. The joint between the tergum and scutum is nearly straight. Has a calcified base, so leaves a white scar when removed. Up to 2 cm diameter, white.