Cebupithecia sarmientoi

Cebupithecia sarmientoi is an extinct New World monkey from the Middle Miocene, in the Laventan land mammal age about 13.8 to 11.8 million years ago, and the type species of the genus Cebupithecia. Its fossils come from the Monkey Beds of the Honda Group at La Venta in Colombia, dated to about 13.5 million years ago. The lower jaw had a dental formula of 2:1:3:3, with procumbent incisors that suggest a close relationship to the living sakis of Pithecia, and stout canines. Its average body mass is estimated at about 1,602 grams. Its ankle bones resemble those of cebines or aotins more than those of pitheciines, and it was probably a frequent quadrupedal walker and leaper, perhaps clinging vertically as sakis do, and may have braced or twisted its tail. It may be the most primitive known pitheciine, and the split between its lineage and the titis has been placed at 15.2 million years ago.