Miocallicebus villaviejai

Miocallicebus villaviejai is an extinct New World monkey from the Middle Miocene, in the Laventan South American land mammal age, about 13.8 to 11.8 million years ago, and the type species of the genus Miocallicebus. Researchers from the Primate Research Institute of Kyoto University found its remains in 1997 at the Bolivia Site in the Tatacoa Desert of Huila, Colombia, just above the Tatacoa Sandstone Beds of the La Victoria Formation. The specimen is a right maxillary fragment with a complete second molar, a root of the first molar and a badly damaged third molar. Its weight is estimated at 1,500 grams, similar to but much larger than the living titis of Callicebus, and it may belong within that genus. The genus name joins the Miocene to Callicebus, and the species name refers to the nearby village of Villavieja. The wider Honda Group is the richest site for fossil primates in South America.