Class Mammalia Linnaeus, 1758 - mammals
   Subclass Theria Parker & Haswell, 1897
     Order Primates Linnaeus, 1758 - primates
       Suborder Haplorrhini Pocock, 1918 see Suborder Haplorhini Pocock, 1918
         Infraorder Simiiformes Haeckel, 1866
           Parvorder Catarrhini Geoffroy Saint-Hilaire, 1812
             Superfamily Cercopithecoidea Gray, 1821
               Family Cercopithecidae Gray, 1821 - Old World monkeys
                 Subfamily Colobinae Jerdon, 1867
                   Genus Trachypithecus Reichenbach, 1862 - brow-ridged langurs, leaf monkeys
                     .1 Subgenus Kasi Reichenbach, 1862
                     .2 Subgenus [Trachypithecus] Reichenbach, 1862
                     01 Trachypithecus auratus (É. Geoffroy Saint-Hilaire, 1812)
                     02 Trachypithecus barbei (Blyth, 1847)
                     03 Trachypithecus cristatus (Raffles, 1821)
                     04 Trachypithecus delacouri (Osgood, 1932)
                     05 Trachypithecus ebenus (Brandon-Jones, 1995)
                     06 Trachypithecus francoisi (Pousargues, 1898)
                     07 Trachypithecus geei Khajuria, 1956
                     08 Trachypithecus germaini (Milne-Edwards, 1876)
                     09 Trachypithecus hatinhensis (Dao, 1970)
                     10 Trachypithecus johnii (J. Fischer, 1829)
                     11 Trachypithecus laotum (Thomas, 1911)
                     12 Trachypithecus obscurus (Reid, 1837)
                     13 Trachypithecus phayrei (Blyth, 1847)
                     14 Trachypithecus pileatus (Blyth, 1843)
                     15 Trachypithecus poliocephalus (Pousargues, 1898)
                     16 Trachypithecus shortridgei (Wroughton, 1915)
                     17 Trachypithecus vetulus (Erxleben, 1777)