Crab ID

[ryanaperez]

I just scavenged near a local beach for this fella thinking it was an emerald crab. Any idea what type of crab this is and if they are reef safe?

 

[Uncle99]

No crab safe in the confines of a glass box.
If you keep expensive stuff, beware of the risks.
He looks like trouble.

 

[ISpeakForTheSeas]

Looks like it may be a Grapsid/Shore Crab (taxonomic family Grapsidae) of some kind, possibly a Pachygrapsus sp., though I don't know for sure. That said, I agree that it's probably not reef-safe.