Class Mammalia Linnaeus, 1758 - mammals Order Primates Linnaeus, 1758 - primates Family Cercopithecidae Gray, 1821 - Old World monkeys Subfamily Colobinae Jerdon, 1867 Genus Pygathrix Geoffroy Saint-Hilaire, 1812 - douc langurs Pygathrix avunculus (Dollman, 1912) - Tonkin snub-nosed monkey see Rhinopithecus avunculus (Dollman, 1912)