black bearded saki ( Chiropotes satanas) is a species of bearded saki, a type of New World monkey. This critically endangered species is endemic to the far eastern Amazon in Brazil, it being restricted to a relatively small region from the Tocantins River in Pará east to around the Grajaú River in Maranhão (similar to the range of the equally threatened Kaapori capuchin). It formerly included the red-backed, brown-backed and Uta Hick's bearded saki as subspecies or taxonomical insignificant variations (in which case the 'combined' species simply was called the bearded saki), but based on colour of pelage, karyotype, and molecular analysis it has been recommended treating these as separate species.  The black bearded saki is the only dark-nosed species of bearded saki with a blackish back, though some females and young have a paler, brownish back.  
References [ edit ]
^ Groves, C.P. (2005). Wilson, D.E.; Reeder, D.M., eds. (3rd ed.). Baltimore: Johns Hopkins University Press. p. 147. Mammal Species of the World: A Taxonomic and Geographic Reference ISBN 0-801-88221-4. OCLC 62265494.
^ Veiga, L. M.; Silva Jr., J. S.; Ferrari, S. F. & Rylands, A. B. (2008). ". Chiropotes satanas" . IUCN Red List of Threatened Species. Version 2008 International Union for Conservation of Nature . Retrieved . 2008-11-24 Database entry includes justification for why this species is critically endangered
^ Silva Jr., J. S. and Figueiredo, W. M. B. (2002). Revisão sistemática dos cuxiús, gênero Chiropotes Lesson, 1840 (Primates Pithecidae). Livro de Resumos do XO. Congresso da Sociedade Brasileira de Primatologia, Amazônia – A Última Fronteira: 21. Belém, Brazil.
^ Bonvicino, C. R., Boubli, J. P., Otazú, I. B., Almeida, F. C., Nascimento, F. F., Coura, J. R., & Seuánez, H. N. (2003). Morphologic, karyotypic, and molecular evidence of a new form of Chiropotes (primates, pitheciinae). American Journal of Primatology. 61(3): 123-33.
^ Veiga, L. V. (2006). Ph.D. thesis. Universidade Federal do Pará, Brazil. (in Portuguese) Ecologia e comportamenta do cuxiú-preto (Chiropotes satanas) na paisagem fragmentada da Amazônoa oriental. Archived July 6, 2011, at the Wayback Machine.
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