Titi to the great diversity found across titi monkey species, a new genus-level taxonomy was recently proposed that recognises three genera within the subfamily Callicebinae; "Cheracebus" Byrne et al. (2016) for the species of the "torquatus" group (Widow titis); "Callicebus" Thomas, 1903, for species of the Atlantic Forest "personatus" group; and "Plecturocebus" Byrne et al. (2016) for the Amazonian and Chaco titis of the "moloch" and "donacophilus" groups. Titi The titis, or titi monkeys, are the New World monkeys of the subfamily Callicebinae, which contains three extant genera, "Cheracebus", "Callicebus", and "Plecturocebus." This subfamily also contains the extinct genera "Xenothrix, Antillothrix",
Coimbra Filho's titi fragment of the population, limiting reproductive options. The species' natural geographical distribution also contributes a threat to the species. Coimbra Filho's titi only naturally occurs in the Atlantic coastal forests in northeastern Brazil. This is a relatively small area in the states of Sergipe and Bahia. Due to this small range, any disturbances to these areas pose a larger than normal threat to the species' survival. More than anything else, however, human interference is the source of many problems to Coimbra Filho's titi. The areas around and inside its habitat are being developed, including paving roads and the promotion of