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Barnacles have a striated calcareous shell. In the middle these crustaceans extend their distinctive brushed legs (cirrer) to capture food from the water. They have in early spring a brief free-living larval stage, before it settles into the water line at many rocky shores. The picture to the right shows the barnacles with two common periwinkles (Littorina) on top.

Read more about barnacles in "Aqua Scope".

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