Sea urchin

Sea urchins or urchins, archaically called sea hedgehogs, are small, spiny, globular animals that, with their close kin, such as sand dollars, constitute the class Echinoidea of the echinoderm phylum. About 950 species of echinoids inhabit all oceans from the intertidal to 5000 m deep.

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Keywords: animals archaically called class close constitute deep dollars echinoderm echinoidea echinoids from globular hedgehogs inhabit intertidal kin oceans phylum sand sea small species spiny such their urchin urchins

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