About Xenodermus javanicus Reinhardt, 1836
Xenodermus javanicus has a distinct head, a long tail, and a slender, compressed body. Its total length reaches about 50 cm (20 in). Males and females can be told apart by checking overall size, tail thickness, tail length, and the area around the cloacal vent for a hemipenial bulge. Females are larger than males, have thinner, shorter tails, and do not have a hemipenial bulge, while males are smaller overall, have thicker, longer tails, and have a visible hemipenial bulge. Xenodermus javanicus occurs in the Malay Peninsula, which includes Malaysia, Thailand, and has one old record from the southernmost tip of Myanmar, as well as on parts of the Greater Sunda Islands including Sumatra, Java, Borneo, and some smaller islands. It lives in damp areas near water, such as forests, swamps, marshes, and rice fields. It is found at elevations below 1,300 m (4,300 ft), and is most common between 500–1,100 m (1,600–3,600 ft) above sea level.
