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",
Ornate titi as the white-tailed titi, but is now officially recognized as its own species. The ornate titi is also terrestrial. The ornate titi is present on the IUCN Red List of endangered species, being recognized as “Vulnerable”, and having a general decrease in population trends. The ornate titi has a thick, dense, fluffy, coat, with white ears and forehead, and grey hands and feet. The rest of the body is a bright chestnut red, apart from the tail, which is a dark-reddish brown or black, becoming white at the tip, and, similar to most titi species, is longer than its body.