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 thomasi (Collett, 1892[1893])