Urchins (Echinoidea) - My Hawaiian Images
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I took this shot with the urchin in motion...another thing that distinguishes this species is that they are very fast. At least, fast for a sea urchin--3" or 4" per second is quick! So, yes, I was actually being charged by this urchin--but I held my ground and got the shot.

urchinblue spot urchinAstropyga radiataEchinoidea