Toumaï, a seven-million-year-old skull, and the thigh bone nobody mentioned
In July 2001 a team combing Chad's Djurab Desert picked up a crushed skull roughly seven million years old. Nicknamed Toumaï, it was hailed as perhaps the oldest known member of the human line. Then a graduate student in France found a thigh bone from the same site sitting among animal fossils, and the arguments began.
Three Chadian researchers and a Frenchman, Alain Beauvilain, collected the first remains on July 19, 2001. Michel Brunet's team described them in 2002 as a new genus and species, Sahelanthropus tchadensis, named for the Sahel and for Chad. Chad's president chose the nickname Toumaï, which in the local Daza language means 'hope of life', a name given to babies born just before the dry season. The find became a point of national pride, announced on television in N'Djamena.
The skull mixes old and new traits: a brain of about 378 cm³, close to a chimpanzee's and roughly a third of ours, alongside a flatter face, small canines and a spinal opening placed toward the front, which Brunet read as a hint of upright walking. That claim rested on a badly distorted skull alone, as the team said no limb bones were associated. Yet a femur found with Toumaï had been shipped to the University of Poitiers in 2003, where student Aude Bergeret came across it the following year; her department head judged it inconsistent with walking on two legs.
The debate has continued. In 2022 Franck Guy's group analysed that femur and two forearm bones and argued they show habitual bipedalism, the earliest known. In 2023 others countered that Sahelanthropus's status as a hominin remains unsettled. Some researchers think it could instead be an early relative of gorillas, which would still make it a rare ancestral ape fossil.
Even its age is disputed. A 2008 study dated nearby sediments to 7.2–6.8 million years ago, but Beauvilain noted the skull lay exposed on the surface, crusted in iron and desert varnish, so its link to those layers is uncertain. He has even argued it was deliberately buried, twice, in a grave facing Mecca.
Source: Sahelanthropus
