My thoughts are that you probably have a juvenile and that it's pretty hard to come up an accurate id, which makes it hard to say anything specific about the urchin. Sorry.....
leslie, it is slightly smaller than a tennis ball i would say or a little bigger than a golf ball. ive got it in a qt tank right now until i can find out if it is reefsafe. would hate to put it in my reef tank then it start eating my zoos and things lol
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