Caption:
Mesopithecus is an extinct genus of Old World monkey that lived in Europe and western Asia 7 to 5 million years ago. It was once thought that it might be an ancestor of the grey langur, but a more recent study suggests that they are more closely related to the snub-nosed monkeys and doucs. Mesopithecus resembled a modern macaque, with a body length of about 16 to 24 inches. It was adapted to both walking and climbing, possessing a slender body with long, muscular limbs and flexible fingers. It had an unusually long thumb, which gave it a very good ability to hold on everything. It appears to have survived the great periods of life on the ground, where it walked on all fours. Fossils were found in Miocene rocks in South America.