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 Cercopithecus sclateri Pocock 1904 Cercopithecus sclateri Pocock 1904 , Abstr. Proc. Zool. Soc. Lond., 1904 (5): 18 . Type Locality: Nigeria , Benin City. Vernacular Names: Sclater's Guenon . Distribution: SE Nigeria , between Niger and Cross Rivers . Conservation: CITES – Appendix II; IUCN – Endangered. Discussion: C. cephus species group. Recognized as a full species by Kingdon (1980:661) .