Urchin id?

Toga2

New member
Happy New Year everyone! Wondering what species this hitchhiking urchin I found the other day is? Came in on some Florida live rock from my lfs. About the size of a nickel. Thanks for looking! Good? He hasn't disturbed anything yet hanging out on some zoas in this pic.
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Rock boring urchin, definitely. They're harmless enough, although (as their name suggests) they dig a hole in the rock to hide in. Makes them pretty hard to spot sometimes.
 
Anyone know how venomous they are? I'm guessing not very as I have two puncture marks on my index finger from handling rock prior to noticing him and didn't even feel them.May have just grazed him though? Bee sting? Thanks
 
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