Need help ID'ing crab hitchhiker

[Reefer Addict]

Well, I got 25 pounds of live rock delivered yesterday, and to my surprise, there were quite a few hitchhikers.
I got a total of 4 hermits, a snail, a bright-green mantis shrimp (about 1" long), and a crab that I can't identify.
I've looked around on the web for a bit, but can't come up with anything even closely resembling this specimen.
Can anybody help? Here's the photo (he's holding onto the mantis shrimp for dear life... probably trying to keep from getting bashed in the skull )

[yakmon]

looks very similar to one i have. hes been living in a rock since ever since i got the rock 2 years ago. never seen it stick more than half its body out of the rock, and only at night.

[Python73]

Let me guess... that is Florida Gulf rock, right? From TBS or GV?

The crab looks like a typical hairy rock crab found on that rock. They get bigger, hairy-er and meaner. Forget about reef safe, or anything else safe for that matter.

That lime green guy is most likely a Neogonodactylus Wennerae, assuming he is a smasher. I have one three times that size in a 6g in my computer room. He's a great pet, I feed him snails and such.

I don't care what anyone says, hitchhikers are the best thing about Florida rock.

S !

[Reefer Addict]

Thanks for the feedback. I kinda figured it would be a predatory crab with it's claw shape, but I was hoping that it might be 'somewhat' reef safe.
It came in on an order of Tonga rock I got from a Florida company, but I'm not sure which one at the moment (ebay purchase).
The mantis unfortunately spent a little too much time in the freshwater bucket I was dipping the rocks in and perished during the night.
I'm pretty sure he was of the slasher variety, since he didn't have the 'big elbows' like the smashers do.
I guess I'll have to find a home for the crab, since I plan on having a variety of shrimps in my tank, and the crab made pretty quick work of the mantis carcass... don't want him eating my beneficials.
Anyway, thanks for the help.