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 Piliocolobus Rochebrune, 1887
                     1 Piliocolobus badius (Kerr, in Linnaeus, 1792)
                     2 Piliocolobus foai (de Pousargues, 1899)
                     3 Piliocolobus gordonorum (Matschie, 1900)
                     4 Piliocolobus kirkii (Gray, 1868)
                     5 Piliocolobus pennantii (Waterhouse, 1838)
                     6 Piliocolobus preussi (Matschie, 1900)
                     7 Piliocolobus rufomitratus (Peters, 1879)
                     8 Piliocolobus tephrosceles (Elliot, 1907)
                     9 Piliocolobus tholloni (Milne-Edwards, in Rivière, 1886)