Black sea urchin

Black sea urchin

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Credit: ALEXIS ROSENFELD/SCIENCE PHOTO LIBRARY

Caption: Black sea urchin (Echinothrix diadema). This sea urchin is found at all depths in the Indo-Pacific region. It is usually black with coloured bands on its spines and has an overall diameter of 20 centimetres. E. diadema has larger primary spines that protect the thinner, venomous spines. A sea urchin is a marine echinoderm invertebrate, related to the starfish. Like a starfish it has radial symmetry. Its shell can be thought of as 5 fused arms. An urchin uses tube feet on its underside to crawl over rocks. The mouth is also on the underside, and has five jaws that scrape up algae growing on the rock surface.

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Keywords: animal, biological, biology, black sea urchin, echinoderm, echinothrix diadema, fauna, floor, indo-pacific, invertebrate, invertebrates, marine, nature, ocean, one, poisonous, sea, sea urchin, seabed, single, spine, spines, spiny, tropical, tropics, underwater, venomous, wildlife, zoological, zoology

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