Urchin ID?

[agent6473]

I'm trying to ID the urchin in the picture, or at least find something that it is close to in order to take a guess at it's behavior and compatibility in a reef tank. Give it your best shot. Sorry for the bad picture, it was taken with my cell phone.

Thanks,
Chris

http://www.bostonreefers.org/forums/attachment.php?attachmentid=18610&stc=1&d=1159294139

[Mike4284m]

Looks like an Enchinometra sp., possibly E. viridis.