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Grapsus albolineatus
Lots of these can be seen clambering about the rocks when the tide is out. Green patterned crab, sometimes also reddish or blueish, also known as Sally Lightfoot Crab
Rocks on coast
3 Comments
Yeah, I deleted the suggestion because on further reflection I thought it looked close but not quite right. It may be that there is some local variation in pattern/coloration, or maybe it's a related species. It looks awful familiar to me, as if I've seen it in another spotting or elsewhere.
Your suggestion of Mottled lightfoot crab Grapsus albolineatus, which I got an e-mail about although it does not show, appears close, but I cannot find much about crabs of Borneo, except as food!
Try looking at species of Grapsus.