Acorn Barnacle

Bulanus spp.

Image by James St. John on Flickr, CC BY 2.0

Physical: This genus includes many of the barnacles on the eastern seaboard. Average size is 2 inches in diameter.

Habitat: Acorn Barnacles grow in partially brackish estuaries on rocks, jetties, and boat bottoms. They are found from high intertidal areas to 1,000 feet in depth.

Feeding: Acorn barnacles are filter feeders that use their cirri to catch plankton and detritus floating in the water column.

Breeding: The larvae stage is free-swimming, while adults are sedentary benthic organisms. Gametes are released into the water column to be taken in and fertilized by females.

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