Urchins (Echinoidea) - My Hawaiian Images
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Another beautiful example of the organic color pattern on the test of a Diadema urchin...this pattern is the result of direct bright light interacting with pigments that are only present in the living anima. note the small red spots at the end of each electric blue branch--I hadn't seen this exact pattern before, and have passed on this photo to a few people who should be able to tell me more.