Coimbra Filho’s titi monkey, Callicebus coimbrai
The Coimbra Filho’s titi monkey, Callicebus coimbrai, was described in 1999 by Kobayashi and Langguth, based on specimens collected in Sergipe, north-eastern Brazil. The species wa snamed in honour of Adelmar F. Coimbra-Filho, founder and ex-director of the Rio de Janeiro Primate Center.
The species was described as “sharply distinguished from Barbara Brown’s titi C. barbarabrownae and Spix’s (1823) figure of C. gigot, by its black head and crown with a clear line demarcating the whitish back of the crown and nape, as well as the buffy preauricular stripe and brownish tail. C. coimbrai differs from the other three members of the Personatus group by the buffy colour of its pelage, the zebra-striped pattern of the anterior half of the back, the well-defined whitish band across the back of the crown and nape, and the buffy preauricular stripe”.
The authors state that “new form is clearly distinguishable, and there is no evidence of hybridisation or transitional phenotypes. The presence of melanochir-like phenotypes within the C. coimbrai populations would be an indication of gene flow and would argue for their classification as subspecies, but this is not the case”. Cranial differences with other species are also reported.
The validity of the species is questioned, but for the moment we consider it as a valid species.