Rio Mayo Titi
Plecturocebus oenanthe
- Critically endangered
- Card rarity: Legendary
- Mammals

The Rio Mayo titi monkey is a species of titi monkey, a type of New World monkey, endemic to Peru. The Rio Mayo titi, was thought previously to have a small range of origin in the Alto Mayo valley, but research has proven that the range extends southward and reaches the Bajo Mayo and Huallaga Central. It had been classified as vulnerable but due to major habitat loss and restricted living space, it is now classified as Critically Endangered. In October 2012, it was included in The World's 25 Most Endangered Primates list. An increase in deforestation is leading to the decrease in available living space for this titi monkey, forcing it to live in sympatry with another species of Callicebus. Yet in some areas, such drastic deforestation has resulted in extremely high population density.
Classification
- Class
- Mammalia
- Order
- Primates
- Family
- Pitheciidae
- Genus
- Plecturocebus