Are these 160,000-year-old Ethiopian fossils the ancestors of all modern humans?

Nature · Published 3 October 2026 · Updated 25 October 2026 Swipe more like this →

In short: Discovered in 1997, the Herto Man remains provided a crucial link in the human evolutionary record. These fossils, dating back 154,000 to 160,000 years, sparked a fierce scientific debate over whether they represent a distinct subspecies or simply an early, transitional stage of our own species, Homo sapiens.

Found in the Afar Triangle of Ethiopia, the Herto Man fossils consist of 12 individuals, including a 6-to-7-year-old child. When first described in 2003, researchers classified them as a new subspecies, Homo sapiens idaltu, suggesting they were a transitional morph between archaic hominins and modern humans. This classification relied on discrete cranial traits, such as a high vault and flat face, which appeared just outside the range of present-day humans.

However, the validity of this subspecies has been heavily contested. Subsequent studies, including those by Kyle Lubsen and Robert Corruccini in 2011 and Robert McCarthy and Lynn Lucas in 2014, argued that the Herto skulls are closely allied with other early modern specimens rather than representing a unique evolutionary branch. By 2016, even prominent anthropologists like Chris Stringer concluded that the label idaltu—derived from the Afar word for 'elder'—was likely unjustified. The debate highlights the inherent difficulty in defining species boundaries within a continuous, evolving lineage.

Beyond their taxonomy, the Herto remains offer a glimpse into ancient life. The site yielded 640 stone tools, including Levallois flakes and Acheulean-style bifaces, suggesting a complex 'Transitional Acheulean' culture. More intriguingly, the skulls show deliberate cut marks and polishing, particularly on the juvenile specimen. These modifications, similar to modern mortuary practices like excarnation, suggest that Herto Man may have engaged in symbolic rituals to prepare their dead, marking a significant milestone in human behavioral evolution.

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