About Callicebus personatus (É.Geoffroy Saint-Hilaire, 1812)
The Atlantic titi monkey, also called the masked titi, has the scientific name Callicebus personatus. It is a species of titi, a kind of New World monkey, that is endemic to Brazil. This species belongs to the genus Callicebus, which originally includes thirteen species and sixteen subspecies. More recent classification systems for titis recognize many more species, and have split the original genus into three separate genera. The C. personatus species group is still kept in the genus Callicebus. Three subspecies of Callicebus personatus have been formally described in scientific literature: C. p. melanochir, C. p. nigrifrons, and C. p. personatus. Some authors have treated each of these three as a full separate species. Atlantic titis are territorial, medium-sized cebid monkeys, and usually weigh between 1 and 2 kilograms. They are primarily found in humid forests east of the Andes Mountains, specifically in coastal and inland forests of southeastern Brazil. Documented states where they live include Bahia, Espírito Santo, Minas Gerais, Rio de Janeiro, and São Paulo. Among all Callicebus species, Atlantic titi monkeys have the second largest geographic range (only smaller than that of C. torquatus), with their range covering approximately 1,000 kilometers. They commonly share their habitat with other monkey species, including lion tamarins and spider monkeys. Atlantic titis are typically monogamous, meaning they stay with a single mate for their entire lifespan. They produce one offspring per year. There are no clear external differences between males and females of this species, but observations of the species' family dynamics show that the father carries the infant at all times during the nursing period.
