When was the first monkey discovered

When did scientists think they showed up on the planet. For example scientists believe that modern humans showed up 55 thousand yrs ago.

Well, in 2007 scientists discovered a 56- million year old skeleton of a primate. The skeleton was the size of a mouse, and it is believed they lived in trees, and ate fruit The fossil was more than 10 million years older then what they previously thought was the oldest member of the primate family.

Well the article 'The First Primates' says that...

"Monkeys evolved from prosimians during the Oligocene or slightly earlier. They were the first species of our suborder--the Anthropoidea . Several genera of these early monkeys have been identified--Apidium and Aegyptopithecus are the most well known. The former was about the size of a fat squirrel (2-3 pounds), while the latter was the size of a large domestic cat (13-20 pounds). Both were probably fruit and seed eating forest tree-dwellers. Compared to the prosimians, these early monkeys had fewer teeth, less fox-like snouts, larger brains, and increasingly more forward-looking eyes."

In case you didn't know, the Oligocene epoch was a period spanning from about 33.7 mya to 23.8 million years ago. Scientist believe that monkeys appeared after the dinosaurs died off.