Hello, I agree with the suggestion made previously by the the Dr. Based on your pictures, the position and form from the pincers or chela (with the dactylus and the pollex), the ubication and lenght of the antenna and others general remarks I would say that there is no doubt thats belong to the infraorder Anomura, and the family Porcellanidae. Nevertheless, I do not know where was this specimen collected because the Family Porcellanidae has about 30 different Genera around the world, and maybe some more information could be helpful to confirm or discard some genera.