Urchins (Echinoidea) - My Hawaiian Images
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A look at the amazing electric-blue structural color pattern on what is probably an adult Diadema cf. savignyi...because the color is the result of light refracting through organic pigments, this pattern only shows up when the living animal is directly illuminated...I took this straight-from-above picture at the request of echinoderm expert Dr. Richard Mooi, who is attempting a positive ID for me. I believe this is a juvenile of the same species.