We took an underwater photography trip to the Philippines in December 2016.
Sea urchins are small round spiny globular echinoderm animals related to sand dollars, sea stars, sea cucumbers, brittle stars, and crinoids. The name "urchin" is an old word for "hedgehog", which sea urchins resemble. They have fivefold symmetry and can move by means of hundreds of tiny transparent tube feet.
Black long-spined sea urchin, Diadema setosum
Banded long-spined sea urchin, Echinothris sp.
Fire urchin, Asthenosoma varium
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Last modified 2 March 2017