Class [Mammalia] Linnaeus, 1758 - mammals Order Primates Linnaeus, 1758 - primates Family Cercopithecidae Gray, 1821 - Old World monkeys Subfamily Colobinae Jerdon, 1867 Genus Presbytis Eschscholtz, 1821 - leaf monkeys Presbytis vetulus Erxleben, 1777 - purple-faced leaf monkey see Trachypithecus vetulus (Erxleben, 1777)