Balanus nubilus

Giant acorn barnacle:

Giant acorn barnacle (Balanus nubilus): This barnacle is usually found as an empty, cast-off shell of such disproportionate dimensions that beachcombers tend to think they have found some deep-sea giant or aberrant formation. However, this species is found intertidally on such treacherous surf-beaten rocks that few people ever see it. It is also seen subtidally by divers.

This species grows to six inches across the base, and when small can be distinguished from worn specimens of Thatched acorn barnacle (Semibalanus cariosus) by the absent of longitudinal striations on the scuta.

Local Notes

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References

Weblinks

• Rosario Beach Marine Laboratory page for Balanus nubilus
• RaceRocks.com page for Balanus nubilus
• James Watanabe page for Balanus nubilus
• Puget Sound Sealife page for Balanus nubilus

• WoRMS Page for Balanus nubilus
• Search Arctos Database for Balanus nubilus (Southeast only)
• Search Arctos Database for Balanus nubilus (entire database)
• Encyclopedia of Life search for Balanus nubilus
• iNaturalist Observations for Balanus nubilus in Southeast Alaska

Other References

• Lamb Hanby 2005
• O'Clair O'Clair 1998

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  Giant acorn barnacle (Balanus nubilus)

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