Parasesarma leptosoma (born 1869 in Hilgendorf), aka the Arboreal Crab, is an arboreal, leaf-eating mangrove crab, found on Rhizophora mucronata and Bruguiera gymnorrhiza, but not on Avicennia marina, and occupying an ecological niche similar to that of another sesarmid, Aratus pisonii, from the Americas. Important physiological adaptations enable these crabs to feed on leaves, with no evidence of fermentation in the gut, a solution common in other animals.