Astropyga radiata (Diadematidae) – fire urchin, blue-spotted urchin 
http://en.wikipedia.org/wiki/Astropyga_radiata

I wonder if the spots are actually luminescent, or just highly reflective?

Photo 1: Geoffrey Bertrand (2011) link

Photo 2: Teresa Zubi (2005?) http://www.starfish.ch/Fotos/echinoderms-Stachelhauter/seaurchins-Seeigel/Astropyga-radiata.jpg

Photo 3: Source: http://www.siratus.com/article-voyage-plongee-jardin-sous-marin-contre-vases-tbt-de-la-trinite-42000672.html

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