Sea urchins are free-living echinoderms with egg-shaped, globular or flattened bodies. They are covered by tightly arranged spines and/or triple-jawed pedicellariae, which are seizing and envenoming organs. The spines can…
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Sea urchins are free-living echinoderms with egg-shaped, globular or flattened bodies. They are covered by tightly arranged spines and/or triple-jawed pedicellariae, which are seizing and envenoming organs. The spines can…