Urgent Baby urchin?????

ok, its been awhile since ive posted on here, tank is still up and running solid. ive had a long spiny sea urchin in the tank for about 2 months. today i was looking at the rock work and saw this small(dime size) black spike thing. i have no idea what it is, to me i think it looks like a baby urchin but have no idea about urchins reproductive system. someone please tell me what it is. thanks

 

It does look like a baby urchin to me but i don't know too much about them.

 

Could be a hitchhiker urchin. I have one that came with LR. It looks just like that one.

 

it is a long spinned black urchin. Very cool hitchhiker I bought one at the LFS when I had my other tank. Unfortunately what is bad about them is that they are bulldozers when it comes to frags...will knock everything over as it gets bigger, esp in a 55g tank. You might want to trade him into the LFS

 

Here is an article on sea urchins. At the bottom of the page is a list of some of the common sea urchins.

If you know where your LR came from it may help identifying it.

 

i have a fowlr tank to coral, and i havent added anything new to the tank in like 3 months, could it be a baby from my other urchin in my tank?

 

Possibly! Yours looks big enough IMO.

 

I dont really know how they reproduce, but it looks like that would be a baby

 

3 months isn't very long in the "hitchhiker just showed up" world LOL.
It could easily have come out of the rock.

 

yeah but the live rock has been in the tank since the begining like 5 months i beleve