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Fossil elephant cranium reveals key adaptations that enabled its species to spread across Africa

A remarkably well-preserved fossil elephant cranium from Kenya is helping scientists understand how its species became the dominant elephant in eastern Africa several million years ago, a time when a cooler, drier climate allowed grasslands to spread and when habitually bipedal human ancestors first appeared on the landscape.

Fossil elephant cranium reveals key adaptations that enabled its species to spread across Africa
Application of consolidant (chemical hardener) to the Loxodonta adaurora cranium KNM-ER 63642
 during the excavation process, by the discoverer of the cranium, Apolo Longaye. The upper right
 third molar is visible in the photo. The cranium might have been crushed under its own weight
after being removed from surrounding sediment if it had not been consolidated
[Credit: Louise Leakey, Turkana Basin Institute/National Geographic

Dated to 4.5 million years ago and recovered from a site on the northeast side of Lake Turkana, it is the only well-preserved elephant cranium -- the portion of the skull that encloses the brain -- from that time. It isabout 85% intact and holds a wealth of previously unavailable anatomical detail, according to University of Michigan paleontologist William Sanders.

Known by its museum number, KNM-ER 63642, the roughly 2-ton cranium belonged to a massive adult male of the species Loxodonta adaurora, an extinct evolutionary cousin of modern African elephants but not a direct ancestor.

KNM-ER 63642 is both impressively immense and unexpectedly modern in aspect, displaying adaptations that likely gave L. adaurora an edge when competing with other large mammals for grasses, according to Sanders, lead author of a study published online in the journal Palaeovertebrata. Co-authors include Meave and Louise Leakey, who led the recovery effort and who are best known for the discovery of early hominid specimens and artifacts from Lake Turkana and elsewhere.

Fossil elephant cranium reveals key adaptations that enabled its species to spread across Africa
Preparators from the National Museums of Kenya at the Ileret research facility of the Turkana Basin
 Institute, starting manual preparation and supplementing the field consolidation (chemical hardening)
 of Loxodonta adaurora cranium KNM-ER 63642. From left to right: Cliff Onyango, Robert Moru
and Christopher Kiarie [Credit: Steve Jabo, Smithsonian Institution]

The L. adaurora cranium is striking because it is raised and compressed from front to back, suggesting a novel alignment of chewing muscles well-suited for the efficient shearing of grasses. In addition, the animal's molars are higher-crowned and had thicker coatings of cementum than other early elephants, making the teeth more resistant to the wear common in animals that feed on grasses close to the ground.

"The evident synchronization of morphological adaptations and feeding behavior revealed by this study of Loxodonta adaurora may explain why it became the dominant elephant species of the early Pliocene," said Sanders, who has studied fossil elephants and their relatives for nearly 40 years in Africa and Arabia.

Eastern Africa was home to seven or eight known species of early elephants at the time, along with horses, antelope, rhinos, pigs and hippos. Many of these animals were becoming grazers and competing for the available grasses.

Fossil elephant cranium reveals key adaptations that enabled its species to spread across Africa
Meave Leakey, left, and William Sanders examining the Loxodonta adaurora cranium KNM-ER 63642
 in its plaster jacket at the Ileret research facility of the Turkana Basin Institute
[Credit: Steve Jabo, Smithsonian Institution]

"The adaptations of L. adaurora put it at a great advantage over more primitive elephants, in that it could probably use less energy to chew more food and live longer to have more offspring," said Sanders, associate research scientist at the U-M Museum of Paleontology and in the Department of Anthropology.

Recovery, conservation, dating, description and identification of the elephant cranium involved collaborative work between researchers and techniciansfrom the Turkana Basin Institute, National Museums of Kenya, University of Michigan, Rutgers University, Smithsonian Institution and University of Utah.

KNM-ER 63642 was discovered in 2013 by a member of the Koobi Fora Research Project from a single molar that was visible at the surface.

Fossil elephant cranium reveals key adaptations that enabled its species to spread across Africa
Loxodonta adaurora cranium KNM-ER 63642 upside down in front view, showing tusk sockets and
 molars, at the Ileret research facility of the Turkana Basin Institute [Credit: William Sanders,
 University of Michigan Museum of Paleontology]

Excavation revealed the presence of a nearly complete cranium. The tusks and the jawbone were missing, and no other remains from that individual were recovered. The adult male is estimated to have been 30 to 34 years old at death.

The fossilized cranium, together with the plaster jacket that protected it and some attached sediment, weighed about 2 tons. Based on a previous study of the skeleton from another L. adaurora adult male with a similar-sized skull, this individual likely weighed about 9 tons and probably stood about 12 feet at the shoulder -- bigger than average male elephants of modern times.

"In my opinion, this elephant skull is by far the most impressive specimen that we have in the Kenyan paleontological collection from Lake Turkana, both in its completeness and in its size," said paleontologist and study co-author Louise Leakey of the Koobi Fora Research Project. "When the teeth were seen on the surface, we had no idea that a complete cranium would be uncovered, and the excavation and recovery operation was both challenging and exciting."

Fossil elephant cranium reveals key adaptations that enabled its species to spread across Africa
William Sanders, left, and Louise Leakey measuring Loxodonta adaurora cranium KNM-ER 63642
at the Ileret research facility of the Turkana Basin Institute. The two-meter-long body calipers used
to take linear measurements on the cranium originally belonged to Louise’s grandfather, the
renowned paleoanthropologist Louis Leakey [Credit: Steve Jabo, Smithsonian Institution]

KNM-ER 63642 is now permanently housed at the Turkana Basin Institute's facility in Ileret, Kenya. It is the only well-preserved elephant cranium from the interval beginning with the origin of elephants 8 million years ago and ending 3.5 million years ago, according to Sanders.

In addition to providing a trove of insights about the anatomy of early elephants, the newly described cranium also deepens our understanding of the connections between those creatures and our earliest human ancestors, the habitually bipedal australopithecines.

Loxodonta adaurora and other early elephants coexisted with two well-known australopithecine species in eastern Africa: Australopithecusanamensis, recovered by Meave Leakey in and nearby the Lake Turkana Basin, Kenya, and A. afarensis, found at sites in Hadar, Ethiopia, and Laetoli, Tanzania.

Credit: University of Michigan                  

In the early Pliocene, as grassy woodlands and grasslands spread across eastern Africa, the australopithecines would have benefited from the presence of elephants. The animals' feeding activities helped keep grasses low to the ground, which would have allowed our upright ancestors to see over the vegetation and to watch for predators.

Elephants also disrupt closed woodlands and create open areas by knocking over trees, uprooting shrubs, and trampling paths through dense forest. And they spread nutrients and grass seed in their dung.

"The origins and early successes of our own biological family are tied to elephants," Sanders said. "Their presence on the landscape created more open conditions that favored the activities and adaptations of our first bipedal hominin ancestors.

Fossil elephant cranium reveals key adaptations that enabled its species to spread across Africa
Map of the geographic position of Ileret Kenya and locality Area 14. A.) Map of the area of interest
for the recovery of elephant cranium KNM-ER 63642 (Loxodonta adaurora), Ileret Region, northeast
 side of Lake Turkana. The green dot indicates the position of Ileret. B.) Detailed map of fossil
localities in the Ileret Region. KNM-ER 63642 was recovered from Area 14 (highlighted)
[Credit: Carol Abraczinskas, University of Michigan Museum of Paleontology]

"From this perspective, it is ironically tragic that current human activities of encroaching land use, poaching and human-driven climate change are now threatening the extinction of the mammal lineage that helped us to begin our own evolutionary journey."

Source: University of Michigan [November 09, 2021]

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1 comment :

  1. Really fantastic find, but is has nothing to do with our ancestors, of course, google e.g. "ape human evolution made easy PPT verhaegen". That our ancestors lived in savannas is a myth which should soon be forgotten: human ancestors have always been waterside, google e.g. "coastal dispersal Pleistocene Homo PPT".


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