ANGEL FITOR / SCIENCE PHOTO LIBRARY ANGEL FITOR / SCIENCE PHOTO LIBRARY
Sea urchin. Close-up of the spines of a sea potato (Echinocardium cordatum) sea urchin. This echinoderm is found in sub-tidal regions in temperate seas around the world and lives buried in the sandy sea floor. Photographed in the Mediterranean Sea, Alicante, Spain.
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