Trachypithecus cristatus

Descriptive notes. Head — body 50 - 58 cm (males) and 46 - 51 cm (females), tail 67 — 75 cm (males) and 66 - 75 cm (females); weight ¢. 6 - 6 kg (males) and ¢. 5 - 7 kg (females). The Silvered Languris variable in color. Circumfacial hair is erect and forward-curled, there is a high pointed crest (but less pointed and high that in the Selangor Silvery Langur, 1. selangorensis), and face is slaty-black. Adult female Silvered Langurs have irregular patches of white on inner parts of upper thighs. Teeth and jaws are relatively short. The nominate subspecies cristatus can be divided into two main morphs, which are very distinct but not genetically and geographically separated (although they are somewhat more so in Sumatra). The silvery-gray “ wltimus ” morph predominates in northern Sumatra; it is uniformly dark gray, tipped with paler gray; it has a black-tinged forehead and yellowish groin and underside oftail. The “ cristatus ” morph has shorter hair tips, especially on its back, giving it an overall almost gray-green color. It occurs further south on Sumatra and on Bangka, Belitung, and Riau Islands. Both morphs occur at almost equal frequencies in Borneo, with the “ cristatus ” morph being perhaps slightly more common. There is an additional, rare reddish morph in Sabah, Borneo. “ Miller’s Silvered Langur ” (7. c. vigilans) is rather darker than the nominate subspecies, with less lightened hair tips. Its crown is dark and surrounded by a well-defined zone of long hair tips.

Sumber: Cercopithecidae