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.