Terrestrial Forest Crab

Welcome! A crab expert who followed Nicky Bay's photo expedition to Tawau photographed this too and identified it as Geosesarma sabanum in his research paper.

Thanks, @ChunXingWong for the ID :)

Thanks Ioarie. That are some very useful diagnostic keys!
Could you please verify whether the crab in this link is really an Arachnothelphusa sp.? http://www.lars-fehlandt.de/2018/02/05/a...
It is also an arboreal crab found in the same forest.

Thanks, @Chun and @loarie for further info.

I'm pretty certain this is Sesarmidae (https://www.inaturalist.org/taxa/84967-S...) of which Geosesarma is a member based on the square carapace, widely set eyes, and arboreal habits. Gecarcinucidae of which Arachnothelphusa is a member tend to have rounder carapaces with beady eyes in deeply set orbits, and also tend to be in mud/water, not in trees. Compare https://www.inaturalist.org/taxa/85783-G...

Either that or Arachnothelphusa sp. which is also found in that area

Thanks, @loarie for the help with ID to the genus level :)

Very cool Albert, I saw crabs similar to this in Penang https://www.inaturalist.org/observations...