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 Hominoidea Gray, 1825
               Family Hominidae Gray, 1825
                 Genus Pongo Lacépède, 1799 - orangutan
                   Pongo pygmaeus (C. Linnaeus, 1760) - orang-utan
                     [Pongo pygmaeus pygmaeus]ᵀ (C. Linnaeus, 1760)