Scientists Discover Little Foot Fossil May Be Entirely New Human Species
Finn's Take· TL;DR- Little Foot fossil may represent entirely new hominin species, challenging decades of classification as Australopithecus.
- Skull analysis reveals distinct anatomical features suggesting Little Foot doesn't fit defining traits of existing species.
- Discovery indicates multiple human ancestor species coexisted in ancient Africa, making evolutionary history more complex than previously thought.
Revolutionary Discovery Challenges Human Evolution Timeline
One of the most complete early human fossils ever discovered may actually represent a completely new species unknown to science. The Little Foot fossil, long considered a member of the Australopithecus genus, now appears to be something far more mysterious—a previously unidentified human ancestor that could reshape our understanding of early human evolution.
Formally catalogued as StW 573, Little Foot is the most complete ancient hominin skeleton ever recovered, dating back roughly two to three million years ago. The fossil earned its nickname from four tiny ankle bones discovered in South Africa's Sterkfontein Caves in the early 1990s, which eventually led to the spectacular find of an almost complete skeleton embedded in rock that took more than 20 years to excavate.
Decades of Scientific Debate Finally Resolved
When paleoanthropologist Ronald Clarke unveiled the skeleton after two decades of excavation, he attributed it to Australopithecus prometheus, while other scholars favored Australopithecus africanus, the species first championed by Raymond Dart in 1925. Dr. Jesse Martin's team from La Trobe University and the University of Cambridge became the first to challenge the species attribution of Little Foot since it was unveiled in 2017, finding that it "does not fit the defining traits of either species."
The team focused on a part of the skull that usually changes very slowly over evolutionary time—the back of the cranium where the head meets the neck. Using high-resolution 3D scans, they documented multiple differences including a longer nuchal plane, a pronounced bump at the back of the skull, and distinct patterns where skull bones join.
Implications for Human Evolutionary History
"The bottom back of the skull is supposed to be fairly conserved in human evolution," Martin explained. "If you find differences between things in the base of the cranium, those differences are more likely to represent different species." If Little Foot really does belong to a distinct species, southern Africa's early Pleistocene and late Pliocene become even more interesting, as multiple hominins may have shared landscapes and navigated shifting climates in parallel.
As Martin notes, it was commonly believed until the 1970s that only one hominin species could exist at one time, but "now we know there were different genus co-existing." He adds that "we think it's normal for us to be the only ones, but really our situation is aberrant."
What This Means for Understanding Our Origins
Martin suggests this discovery could represent not just "a point in our human family tree we hadn't discovered before, but an entire limb." The authors stopped short of formally naming a new species, saying that decision should be left to the team that excavated Little Foot over more than two decades.
This scenario mirrors evidence from East Africa, showing "a branching, braided bush rather than a single-file march toward Homo." For a fossil that already transformed the field by its completeness, Little Foot may be about to do it again—this time by insisting we broaden the cast list of our deep past. The discovery suggests that early human evolution was far more complex and diverse than previously imagined, with multiple species coexisting and adapting to different environments across ancient Africa.