Fossil suggests apes, old world monkeys moved in opposite directions from shared ancestor
(PHYSorg.com Archaeology & Fossils)

In terms of their body plan, Old World monkeys-a group that includes primates like baboons and macaques-are generally considered more similar to ancestral species than apes are. But a new study that analyzes the first well-preserved femur of Aegyptopithecus zeuxis, a common ancestor of Old World monkeys and apes, suggests that as far as locomotion goes, apes and Old World monkeys each evolved a way of moving that was different from the ancestral species as they adapted to different niches in their environments.