This is Chiromantes (=Holometopus) dehaani (無齒螳臂蟹)
According to the identification key in the article that Little.Pixel cited, the distinguishing feature to identify Chiromantes is to check for the absence of transverse pectinated ("comb-like") crests on dorsal surface of cheliped manus, NOT absence of tubercles. Based on the photos available, the crabs are C. dehaani based on the observation that:
(1) The crabs have a rather "thick" body in which the lateral edges of the carapace are straight with no clear dentation
(3) There is clear "zoning" on the carapace surface
(3) There are no pectinated crests on the dorsal surface ("palm") of cheliped manus
(4) The chelipeds are rough and granulated
(5) The walking legs have thick & long setae ("hairs")
Hope this is of help.