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We found this on a beach in the Bay of Lannion, Brittany, France. What is it? About 6 cm long.

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It is the skeleton of Sea Urchin or sea hedgehog.

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There are a lot of species (nearly 1000), so it is very difficult to identify just in five minutes, but in general you can start from knowing the Subclass Perischoechinoidea.

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