Geosesarma perracae is found in swampy lowlands usually near freshwater.
More about this on the Nature in Singapore website: First record in Singapore of a nepenthiphilous crab, Geosesarma perracae (Crustacea: Decapoda: Sesarmidae). H. H. Tan and P. K. L. Ng. Pp. 201-205. [PDF, 793 KB]