GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY
Ball urchin (Mespilia globulus) on a rock. This sea urchin inhabits reefs in the tropical Indo- Pacific area. It is generally nocturnal, hiding during the day and emerging at night to graze on algae. It is a small sea urchin, rarely exceeding six centimetres in diameter. Photographed in the Andaman Sea, Myanmar.
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