Aotus dindensis

Aotus dindensis is an extinct species of night monkey from the Middle Miocene of Colombia, known from the Laventan stage, roughly 13.8 to 11.8 million years ago. Its remains come from the Monkey Beds of the Honda Group at La Venta, one of the richest fossil primate sites in South America, and it takes its name from the El Dinde locality there. The species was named in 1987 by Setoguchi and Rosenberger from jaw and tooth material found in 1986, a left half of a lower jaw and a piece of an upper jaw. Its teeth are very like those of living night monkeys but more primitive, so researchers have treated it as the oldest known member of the genus and a possible ancestor of the living species, although some authors regard it as a synonym of Mohanamico. Its body mass is estimated at about 1,054 grams, it probably lived a nocturnal life like its modern relatives, and its teeth show a tendency to sexual dimorphism that has since faded in living night monkeys.