Rock Platforms: Spray Zone - Barnacle Anatomy

Adult acorn barnacles are sedentary and live suspended within a conical test (or shell), made of calcium carbonate plates cemented to the substratum.

This is a diagrammatic representation of the arrangement of the parts of an acorn barnacle.

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This is a diagrammatic representation of the arrangement of the parts of an acorn barnacle.

Move the mouse over any part of the barnacle for a description of that part. There are fourteen parts for you to identify.