Callicebus caquetensis: A New and Critically Endangered Titi Monkey from Southern Caquetá, Colombia

Abstract: We describe a new species of titi monkey Callicebus (Primates: Platyrrhini) from the Department of Caquetá, Colombia, that belongs to the Callicebus cupreus group. Diagnostic characteristics: it is similar in fur color to C. ornatus and C. discolor, but has no white band on the forehead as in C. ornatus and C. discolor, and the hands and feet are not white as they are in C. ornatus. The karyotype of this species is 2n=46, and very similar to that published for C. cupreus. Comparing it to neighboring species, it is more similar cytologically to C. discolor than to C. ornatus. It should be classified as Critically Endangered (CR) due to the severe fragmentation of its habitat and very small population.