Primate Rescue Center

New Fossil Could Reshape Our Understanding of Ape Evolution

Erika Fleury October 29, 2015

A newly discovered species of primate may rewrite the history of great apes — the group that includes humans. The new species, named Pliobates catalonia and described in a study published Thursday in Science, has been placed at the base of the ape family tree. The researchers who have discovered the species believe it to be a direct descendent of a common ancestor of all apes — the great apes like ourselves, gorillas and chimps, and the so-called lesser apes, also known as gibbons.

Image courtesy Marta Palmero / Institut Català de Paleontologia Miquel Crusafont

Except for their lack of tails, gibbons could easily be mistaken for monkeys. They're smaller than great apes, and quite clearly less related to humans. Pliobates catalonia, which lived about 11.6 million years ago, would have been a similar size. But although it's gibbon-sized and lived after the presumed divergence of the branches of the ape family tree, Pliobates catalonia has features that make it seem like a great ape ancestor.

Siamang Jenny is a gibbon living at the PRC.

This fossil itself came along too late to be a common ancestor of all living primates, according to previous molecular analysis of our evolutionary history. Based on that analysis, the split happened between 15 and 20 million years ago. But the researchers believe it could be a direct descendant of that last common ape group, before the split occurred.

And if that's really the case, it might refute a long-held notion that our common ancestor was like a great ape. We may have all descended from something quite gibbon-like.

"This way Pliobates provides a lot of insight on how this last common ancestor of all extant hominoids might have looked like," lead study author David Alba of the Miquel Crusafont Catalan Institute of Paleontology told The Post. "In particular, Pliobates indicates that gibbons must not necessarily be a dwarfed lineage, and suggests instead that the last common ancestor of both lesser and great apes was, at least in several respects — such as skull shape and body size — more gibbon-like than previously thought. This thus has implications for the origin of gibbons, which is quite important if we take into account that there is no known fossil record of gibbons for at least their first ten million years of evolutionary history."

It's possible that the fossil, nicknamed Laia, is simply another gibbon ancestor. Her more great-ape-like features could be the result of an evolutionary coincidence. Because Laia is too old for molecular analysis, there's no real way of knowing. But as a possible glimpse into our past, she's certainly providing paleontologists with food for thought.

- The Washington Post

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