It was interesting to see this rostrate barnacle (Balanus rostratus) feeding, while attached to a swimming scallop also feeding in the plankton filled current. This tall barnacle often has a smooth surface, and the opening where the basket-like limbs (cirri) extend to gather plankton in the current is fairly small. The rostrate barnacle has a range from the Aleutian Islands, Alaska to northern Washington, and can grow to 2 inches (5.6 cm) in height.
Reference:
Jensen, Gregory with Gotshall, Daniel and Flores-Miller, Rebecca. Beneath Pacific Tides: Subtidal Invertebrates of the West Coast. Bremerton: MolaMarine, 2018.
