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Black bearded saki
The 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.〔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.〕 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.〔Veiga, L. V. (2006).''( Ecologia e comportamenta do cuxiú-preto (Chiropotes satanas) na paisagem fragmentada da Amazônoa oriental. )'' Ph.D. thesis. Universidade Federal do Pará, Brazil.〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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