Callicebus

{{Short description|Genus of New World monkeys}}

{{Automatic taxobox

| image = Callicebus personatus.jpg

| image_caption = Atlantic titi (Callicebus personatus)

| taxon = Callicebus

| authority = Thomas, 1903

| type_species = Simia personatus

| type_species_authority = É. Geoffroy, 1812

| subdivision_ranks = Species

| subdivision =

Callicebus barbarabrownae

Callicebus coimbrai

Callicebus melanochir

Callicebus nigrifrons

Callicebus personatus

}}

Callicebus is a genus of monkeys known as titi monkeys.

Historically, titis were monogeneric, comprising only the genus Callicebus Thomas, 1903. 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 Byrne et al., 2016 for the species of the torquatus group (Widow titis); Plecturocebus Byrne et al., 2016 for the Amazonian and Chaco titis of the moloch and donacophilus groups; and Callicebus Thomas, 1903 sensu stricto, for species of the Atlantic Forest personatus group.{{Cite journal|last1=Byrne|first1=Hazel|last2=Rylands|first2=Anthony B.|last3=Carneiro|first3=Jeferson C.|last4=Alfaro|first4=Jessica W. Lynch|last5=Bertuol|first5=Fabricio|last6=da Silva|first6=Maria N. F.|last7=Messias|first7=Mariluce|last8=Groves|first8=Colin P.|last9=Mittermeier|first9=Russell A.|date=2016-01-01|title=Phylogenetic relationships of the New World titi monkeys (Callicebus): first appraisal of taxonomy based on molecular evidence|journal=Frontiers in Zoology|volume=13|pages=10|doi=10.1186/s12983-016-0142-4|issn=1742-9994|pmc=4774130|pmid=26937245 |doi-access=free }}

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.{{cite web |last1=Vriesendorp |first1=Corine |title=Possible New Primate Discovered in Peru |url=https://www.fieldmuseum.org/blog/possible-new-primate-discovered-peru |publisher=Field Museum of Natural History |access-date=6 February 2022 |date=27 March 2015}}