Sea-urchin

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Sea-urchins are Echinoderms. Their shell is mainly composed of calcareous plates.

Keywords

Echinodermata, Echinoderm, sea-urchin, test

Galleries

Sea Urchins and Sea Stars

Source

H. Alleyne Nicholson, An Introductory Text-book of Zoology(Edinburgh:William Blackwood and Sons, 1971) 50

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