Giant Acorn Barnacle

Pronunciation

How to pronounce Balanus nubilus: /ˈbɑːlənəs ˈnjuːbɪləs/

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Summary

Balanus nubilus, or giant acorn barnacle, is the largest barnacle species, typically found in the northeast Pacific from southern Alaska to Baja California, thriving in coastal habitats.

Physical Characteristics

Largest barnacle species, reaching a diameter of 15 cm (6 in) and a height of up to 30 cm (12 in). Contains the largest known muscle fibres.

Identification Tips

Look for large barnacles with a distinctive acorn shape on rocks or hard surfaces.

Habitat

Found growing on rocks, pier pilings, and hard-shelled animals at depths of up to 90 m (300 ft).

Distribution

Ranges from southern Alaska to Baja California in the northeast Pacific.

Diet

Filter feeder that consumes plankton and other small particles from the water.

Predators

Eaten by sea otters, sea stars, and crabs, as well as by Native Americans of the Pacific Northwest.

Ecosystem Role

Functions as a filter feeder and provides habitat for other species, such as the crab Glebocarcinus oregonensis.

Cultural Significance

Harvested and consumed by Native Americans of the Pacific Northwest.

Tags

• barnacle
• Balanus nubilus
• giant acorn barnacle
• marine biology
• filter feeder