Final answer:
The Proconsul group is the most abundant and successful group of early Miocene anthropoids, possibly containing the last common ancestor of Old World monkeys and apes.
Step-by-step explanation:
The Proconsul group represents the most abundant and successful anthropoids of the early Miocene. It also probably contained the last common ancestor shared by the Old World monkeys and apes. During the Miocene epoch, which spans from 23 to 14 million years ago, Proconsul africanus africanus lived in Africa and showed traits like a 2.1.2.3 dental pattern and a lack of a tail, characteristic of both Old World monkeys and apes, thereby placing them closer to hominins, a group representing modern humans, extinct human species, and all of humanity's immediate ancestors. Despite lacking long, curved digits which would have facilitated brachiation, Proconsul likely moved about on all fours, demonstrating a form of locomotion that is somewhat intermediate between the quadrupedalism seen in monkeys and the two-footed walking patterns of later hominins.