Class Mammalia Linnaeus, 1758 - mammals Order Primates Linnaeus, 1758 - primates Family Hylobatidae Gray, 1871 - gibbons Genus Hylobates Illiger, 1811 - gibbons Hylobates gabriellae Thomas, 1909 - red-cheeked gibbon see Nomascus gabriellae (Thomas, 1909)