Resource for ID Sea Urchin?

J. Montgomery

Mouth Pipetting
I recently acquired a small sea urchin as a hitchhiker on a small zoa rock. Can anyone recommend a good site for identifying sea urchins? Thanks.
 
Cool, thanks for the great link Kabong.

I think that I either have a Little Sea Urchin (Psammechinus microtubeculatus) or a Common/Burrowing Urchin (Echinometra mathaei). Does anyone have experience/comments about these? Like how to tell them apart?
 
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