Order Primates Author Wilson, Don E. Author Reeder, DeeAnn text 2005 The Johns Hopkins University Press Baltimore Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 1 111 184 book chapter 0-8018-8221-4 10.5281/zenodo.7316519 Allenopithecus Lang 1923 Allenopithecus Lang 1923 , Am. Mus. Novit., 87: 1 . Type Species: Cercopithecus nigroviridis Pocock 1907 Species and subspecies: 1 species: Species Allenopithecus nigroviridis (Pocock 1907) Discussion: Separated from Cercopithecus by Thorington and Groves (1970:638) , Szalay and Delson (1979) , and Groves (1989, 2001 c ).