ANGEL FITOR / SCIENCE PHOTO LIBRARY ANGEL FITOR / SCIENCE PHOTO LIBRARY
Sea urchin detail. Close-up of the spines and the ambulacral system of a purple sea urchin (Paracentrotus lividus). The ambulacral, or water vascular, system is a network of fluid-filled canals unique to echinoderms, which functions in gas exchange, feeding, and locomotion. Photographed in the Mediterranean Sea, Alicante, Spain.
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