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Barnacles are arthropods in the sub-phylum crustacea, related to crabs and shrimp. As filter feeders, barnacles use specialised appendages called cirri to gain food from their environment, and as such are most commonly found in areas of high water movement. Their soft bodies are protected by tough, armoured plates and anchored tight to the substrate using a powerful glue-like secretion. Further plates form a “door”, or operculum, which the barnacle can open and close to prevent desiccation (drying out).
Additional ID features- Hawkins and Jones 1992 ; Hayward and Ryland 1995: Illustrations by Laura Coles
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