Callicebus is a genus of monkeys known as titi monkeys.
Historically, titis were monogeneric, comprising only the genus Callicebus <small>Thomas, 1903</small>. Owing 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 <small>Byrne et al., 2016</small> for the species of the torquatus group (Widow titis); Plecturocebus <small>Byrne et al., 2016</small> for the Amazonian and Chaco titis of the moloch and donacophilus groups; and Callicebus <small>Thomas, 1903</small> sensu stricto, for species of the Atlantic Forest personatus group.
In 2014, a previously unknown orange Callicebus was spotted in the Peruvian Amazon; it has not been determined whether this constitutes a color variant or a new species.
Species
There are 5 species in this genus:
- Barbara Brown's titi monkey, Callicebus barbarabrownae
- Coimbra Filho's titi monkey, Callicebus coimbrai
- Coastal black-handed titi monkey, Callicebus melanochir
- Black-fronted titi monkey, Callicebus nigrifrons
- Atlantic titi monkey, Callicebus personatus
thumb|left|Callicebus species