Black long-spined (diadem) sea urchin, Diadema setosumWe took an underwater photography trip to the Philippines in December 2016. We returned in November 2024.
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 (diadem) sea urchin, Diadema setosum
Banded long-spined sea urchin, Echinothris sp.
Double-spined urchin, Echinothrix calamaris
Fire urchin, Asthenosoma varium
Cake (collector) urchin, Tripneustes gratilla
Radiant sea urchin, Astropyga radiata
Flower urchin, Toxopneustes pileolus
Rock-boring (burrowing) urchin, Echinometra mathaei
Savigny's sea urchin, Diademus savignyi
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Last modified 11 December 2024