Balanus nubilus

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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.

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