Hi Steve. So you actually ordered an urchin but they shipped you the wrong one. Not only did they ship you the wrong one but they shipped you a destructive non-reef safe urchin?
BMW Rider, did you pay for your urchin or was that a hitchhiker too. Thanks for the ID. I'll check it out.
I just got the book Reef Invertebrates today and the only urchin I see that looks close to it is Echinometra methaei. The book doesn't show each and every species of urchin. It says that it is rock-boring which explains why mine is in the same location on the rock ever since I saw it. Anyhow, I'm not sure if I want to keep this urchin or not. If they are venomous, its just a matter of time before I get pricked by it and die (well maybe not die) or at least feel excruciating pain.
