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Infraclass Cirripedia

Barnacles sitting on a plateMax Size: <1 cm diameter (<0.5in)
Habitat: Shallow, marine environments and attached to hard substrates.
Diet: Plankton

Northern Barnacle (Semibalanus balanoides)
Ivory Barnacle (Amphibalanus eburneus)





Fun Facts:

  • Larval Barnacles travel for food, but once they mature they settle in one location: typically on rocks, ships, piers or pilings, but sometimes on large animals such as whales.
  • Barnacles typically live for about 10 years, but some of the larger species can live up to 20 years.
  • They are actually crustaceans that construct a calcareous (calcium-based) shell around themselves; they look like little, upside-down shrimp inside the shell!
  • S. balanoides (Northern barnacle) is more common, A. eburneus (ivory barnacle) is whiter and wider with a lower peak.