The researchers gained insight into not only the biology of Little Foot’s species but also the hardships that this individual, an adult female, encountered during her life.
Little Foot’s species blended apelike and humanlike traits and is considered a possible direct ancestor of humans. Ron Clarke, a University of the Witwatersrand paleoanthropologist who unearthed the fossil in the 1990s in the Sterkfontein Caves northwest of Johannesburg and is a co-author of the new study, has identified the species as Australopithecus prometheus.
“In the cranial vault, we could identify the vascular canals in the spongious bone that are probably involved in brain thermoregulation — how the brain cools down,” said Amélie Beaudet, a University of Cambridge paleoanthropologist who led the study published in the journal e-Life.
“This is very interesting as we did not have much information about that system,” Beaudet added, noting that it probably played a key role in the threefold brain size increase from Australopithecus to modern humans.
Little Foot’s teeth also were revealing.
“The dental tissues are really well preserved. She was relatively old since her teeth are quite worn,” Beaudet said, although Little Foot’s precise age has not yet been determined.
The researchers spotted defects in the tooth enamel indicative of two childhood bouts of physiological stress such as disease or malnutrition.
“There is still a lot to learn about early hominin biology,” said study co-author Thomas Connolley, principal beam-line scientist at Diamond, using a term encompassing modern humans and certain extinct members of the human evolutionary lineage. “Synchrotron X-ray imaging enables examination of fossil specimens in a similar way to a hospital X-ray CT scan of a patient, but in much greater detail.”
Little Foot, whose moniker reflects the small foot bones that were among the first elements of the skeleton found, was roughly 4 foot 3. Little Foot has been compared in importance to the fossil called Lucy that is about 3.2 million years old and less complete.
Both are species of the genus Australopithecus but possessed different biological traits, just as modern humans and Neanderthals are species of the same genus — Homo — but had different characteristics. Lucy’s species is called Australopithecus afarensis.
“Australopithecus could be the direct ancestor of Homo — humans — and we really need to learn more about the different species of Australopithecus to be able to decide which one would be the best candidate to be our direct ancestor,” Beaudet said.
Our own species, Homo sapiens, first appeared about 300,000 years ago.
The synchrotron findings build on previous research on Little Foot.
The species was able to walk fully upright, but had traits suggesting it also still climbed trees, perhaps sleeping there to avoid large predators. It had gorilla-like facial features and powerful hands for climbing. Its legs were longer than its arms, as in modern humans, making this the most-ancient hominin definitively known to have that trait.
“All previous Australopithecus skeletal remains have been partial and fragmentary,” Clarke said.