August 09, 2017
Humans are most closely related to living ape species, including chimpanzees, gorillas, orangutans and gibbons. Our common ancestor with chimpanzees lived in Africa six to seven million years ago, and many spectacular fossil finds have revealed how humans evolved since then. In contrast, little is known about the evolution of the common ancestors of living apes and humans before ten million years ago. Relevant fossils are scarce, consisting mostly of isolated teeth and partial jaw bones. It has therefore been difficult to find answers to two fundamental questions: did the common ancestor of living apes and humans originate in Africa, and what did these early ancestors look like?
Now these questions can be more fully addressed because the newly discovered ape fossil, nicknamed Alesi by its discoverers, and known by its museum number KNM-NP 59050, comes from a critical time period in the African past. In 2014, it was spotted by Kenyan fossil hunter John Ekusi in 13 million year-old rock layers in the Napudet area, west of Lake Turkana in northern Kenya.
The fossil is the skull of an infant, and it is the most complete extinct ape skull known in the fossil record. Many of the most informative parts are preserved inside the fossil, and to make these visible the team used an extremely sensitive form of 3D X-ray imaging at the synchrotron facility in Grenoble, France. “We were able to reveal the brain cavity, the inner ears and the unerupted adult teeth with their daily record of growth lines” says Paul Tafforeau of the European Synchrotron Radiation Facility. “The quality of our images was so good that we could establish from the teeth that the infant was about one year and four months old when it died.”
The unerupted adult teeth inside the infant ape’s skull also indicate that the specimen belonged to a new species, Nyanzapithecus alesi. The species name is taken from the Turkana word for ancestor “ales.” “Until now, all Nyanzapithecus species were only known from teeth and it was an open question whether or not they were even apes,” notes John Fleagle of Stony Brook University. “Importantly, the cranium has fully developed bony ear tubes, an important feature linking it with living apes”, adds Ellen Miller of Wake Forest University.
Alesi’s skull is about the size of a lemon, and with its notably small snout it looks most like a baby gibbon. “This gives the initial impression that it is an extinct gibbon,” observes Chris Gilbert of Hunter College, New York. “However, our analyses show that this appearance is not exclusively found in gibbons, and evolved multiple times among extinct apes, monkeys, and their relatives.” That the new species was certainly not gibbon-like in the way it behaved could be shown from the balance organ inside the inner ears. “Gibbons are well known for their fast and acrobatic behaviour in trees,” says Fred Spoor, “but the inner ears of Alesi show that it would have had a much more cautious way of moving around.”
“Nyanzapithecus alesi was part of a group of primates that existed in Africa for over ten million years”, concludes lead author Isaiah Nengo. “What the discovery of Alesi shows is that this group was close to the origin of living apes and humans, and that this origin was African”.
The work was supported by The Leakey Foundation and trustee Gordon Getty, the Foothill-De Anza Foundation, the Fulbright Scholars Program, the National Geographic Society, the European Synchrotron Radiation Facility and the Max Planck Society.
The Leakey Foundation, SJ/HR