crab ID please.

[azrednex]

Hitchhiker fairly secretive pincers has teeth on them picks at the LR purpleish pincers.

 

[AJF]

can't see the pics!

 

[siren]

how big is it? From what I can see it's a stone crab. I don't think their really BAD, but they can catch and eat small fish and other inverts when they get bigger. If that is what it is, I'd remove him and put him in my sump or something.

 

[azrednex]

carapace is about 1" across .

 

[jaymz101]

Did I post on the other one too??

xanthid, most folks ditch them asap. but will be fine thill they develop a taste for your favorite coral/polyp/fish/etc.

While Stone crabs are in the xanthid family this is not the Florida Stone crab (Menippe mercenaria) that we all know and love from Florida's Gulf coast. They have larger claws, rounder and larger carapace, are fairly bulky and, at that size, completely dark purple (almost black) with small white spots on carapace and white bands on walking legs (interestingly in texas, where they have the Gulf Stone crab the adults are colored like Florida juveniles and juveniles are lightly colored like FSC adults)

pics:
Stone crab
#1 juvenile FSC and adult Gulf Stone crab coloration
http://www.huntstats.com/images/Crab3.jpg

#2 vice versa
http://www.welcometomiamibeach.com/images/stone_crab.gif

general xanthid species

http://www.wetwebmedia.com/Arthropoda/CrustaceanPIX/SWCrabs/crab006a.jpg

porceline (called stone crabs in the Phillipines) (good crabs)

http://www.paddleasia.com/images/phang_nga_page/thumb-stone-crab.jpg

 

[azrednex]

this crab is unlike those pictured in any of your links. The third one is close but while the banded legs and pupleish claws are sort of right the shape of the body is all wrong.

 

[boomsticks]

Green Crab>?

 

[jaymz101]

Green crabs are portunids (swimming crabs) and would have paddles for the last set of legs (and largely extended lateral spines).

Im pretty sure its a xanthid and stick to my advice above.

 

[Msby12]

do you know where you got your live rock from? because there are crabs in that look like that

try this
http://www.beachwatchers.wsu.edu/ezidweb/hemig6.htm
it's called a purple shore crab

 

[spawner]

better look in to graspid crabs, tons of different speices but yours is one.