Branco River and eastward, and a brown-backed from the Branco River and westward. References Further reading Peters, G.; T. Haus; and R. Hutterer (2014). Neotropical primates from the Cologne Zoo in the collections of the Zoologisches Forschungsmuseum Alexander Koenig: noteworthy specimens, taxonomic notes and general considerations. Bonn zoological Bulletin 63 (2): 173–187. bearded saki, brown-backed Mammals of Brazil Mammals of Venezuela brown-backed bearded saki Taxobox binomials not recognized by IUCN Taxa named by Johann Baptist von Spix