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Oursin de mer
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Pilou et Marino
Pilou et Marino
Nausicaa - Centre National de la Mer de Boulogne - sur -Mer. Les Oursins sont un groupe d'animaux marins, formant la classe des Echinoidea au sein de l'embranchement des échinodermes. Ils sont aussi appelés par les scientifiques Échinoïdes ou Échinides.
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