Mammalia Linnaeus, 1758 - mammals
   Theria Parker & Haswell, 1897
     Primates Linnaeus, 1758 - primates
       Haplorrhini Pocock, 1918 see Suborder Haplorhini Pocock, 1918
         Simiiformes Haeckel, 1866
           Catarrhini Geoffroy Saint-Hilaire, 1812
             Cercopithecoidea Gray, 1821
               Cercopithecidae Gray, 1821 - Old World monkeys
                 Colobinae Jerdon, 1867
                   Trachypithecus Reichenbach, 1862 - brow-ridged langurs, leaf monkeys
                     Trachypithecus phayrei (Blyth, 1847)
                       [Trachypithecus phayrei phayrei] (Blyth, 1847)