Urchins (Echinoidea) - My Hawaiian Images
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This is a rare one--quite possibly a specimen of Savigny's urchin (Diadema savignyi), and certainly one of the most beautiful echinoderms I've photographed. John Hoover was good enough to put me in touch with Echinoderm expert Dr. Rich Mooi who feels this is either a juvenile D. savignyi, or else an unknown endemic species--much more research needs to be done on echinoderms in general and Diadema in particular.