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Family: Balanidae

Group: Marine Invertebrate, Species

Scientific NameCommon NameSummary
Balanus crenatusCrenate barnacleThis barnacle is common in harbors and on the hulls of boats. Unlike Balanus balanus, this species does not have its scuta pointed up like a beak.
Balanus nubilusGiant acorn barnacleThis 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.