Oldest Evidence of Split Between Old World Monkeys and Apes: Primate Fossils Are 25 Million Years Old


Two fossil discoveries from the East African Rift reveal new information about the evolution of primates, according to a study published online in Nature this week led by Ohio University scientists.

The team's findings document the oldest fossils of two major groups of primates: the group that today includes apes and humans (hominoids), and the group that includes Old World monkeys such as baboons and macaques (cercopithecoids).

Geological analyses of the study site indicate that the finds are 25 million years old, significantly older than fossils previously documented for either of the two groups.

Both primates are new to science, and were collected from a single fossil site in the Rukwa Rift Basin of Tanzania. Rukwapithecus fleaglei is an early hominoid represented by a mandible preserving several teeth. Nsungwepithecus gunnelli is an early cercopithecoid represented by a tooth and jaw fragment.

The primates lived during the Oligocene epoch, which lasted from 34 to 23 million years ago. For the first time, the study documents that the two lineages were already evolving separately during this geological period.

"The late Oligocene is among the least sampled intervals in primate evolutionary history, and the Rukwa field area provides a first glimpse of the animals that were alive at that time from Africa south of the equator," said Nancy Stevens, an associate professor of paleontology in Ohio University's Heritage College of Osteopathic Medicine who leads the paleontological team.

Written By: Science Daily
continue to source article at sciencedaily.com


  1. In reply to #1 by A3Kr0n:

    I can’t wait to hear what the God of the Gaps will have to say about this.

    The answer came to me in a vision, he said “When you find one specimen in the middle of a gap, you create two new gaps. Until the gaps get small enough, you’ve got work to do.”

  2. More than likely they’ll just stick their fingers in their ears and deny this report was ever even published. That seems to be the latest trick. Rather than point out gaps and ask for transitional forms, they simply deny they even exist.

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