Sally Lightfoot Crab

Cool

Yes, these guys are fascinating. I worked on them half a century ago. For some info look at http://www.darwinfoundation.org/datazone/media/pdf/7-8/NG_7%268_Dec_1966_Kramer_Behavior.pdf or http://www.ncbi.nlm.nih.gov/pubmed/5597713. My basic paper is long - and in German, though.

beauty ! nice shot dear

I would guess this is a female, because I don't see bristles on the front walking legs and ther claws are relatively small. But it also could be a half grown male. The only way to be sure, as with all crabs, would be to look at the abdomen, which is narrow in males and wide in females.