Here, from the reconstructed Neanderthal skull. Scientists have just examined the shape of the teeth between neanderthals, relatives and relatives to find out when they were divorced.
Credit: Getty Images
Modern people and Neanderthals could have been at least 800,000 years ago. 1
This new evaluation is much older than previous calculations based on old DNA analysis that balances between humans and neanderthals, as it happened between 500,000 and 300,000 years ago.
externally called the new dental analysis impressive, they note that it is based on one major assumption that the tooth shape is constantly evolving, especially in the Neanderthals. If the shape of the teeth does not change at a constant rate, then "the design of this document collapses," said Fernando Ramirez Rozzi, the center of the French National Research Center in Toulouse, specializing in human evolution. study. [Photos: See the Ancient Faces of a Man-Bun Wearing Bloke and a Neanderthal Woman]
This means that it is quite possible that the teeth (especially the neanderthal teeth) develop at a predictable rate, which means that the calculation of the new test can be applied. "There is an idea now that the shape of the cheek teeth is changing steadily," said Ramirez Rozzi.
Scientists have examined 931 teeth belonging to at least 122 individuals from eight groups, including people and close relatives. Of these, 164 were from the early neanderthals of Sima de los Huesa (Beat of the Bones) in Spain, which includes nearly 30 people who lived about 430,000 years ago in the Middle Pleistocene.
By comparing tooth shape differences between samples, researcher Aida Gomez-Robles, a paleoanthropologist at London University College, has been able to calculate evolutionary dental shape variables and then estimate the difference from the last common ancestor between humans and neanderthals .
The result is that the Neanderthals and modern people probably differed more than 800,000 years ago shows that the ultimate ancestor of these two groups is probably not Homo heidelbergensis as some scientists believe.
" Heidelbergensis cannot take such an evolutionary position because he after the emergence of the differences between neanderthals and modern people," said Gomez-Robles, "Live Science". "This means that we need to look at older species when looking for these common kinds of ancestors."
"also has a great influence on how we interpret fossil records and evolutionary relationships between species," said Gomez-Robles.
Restoring the Differences of Neanderthals and Modern People "opens a new door" because it shows that the two groups were much longer than the previous ones, Ramirez Rozzi said
. it raises the question, he said. People and the Neanderthals passed over 60,000 years ago when modern people left Africa. (This interaction explains why some modern people have almost 3% of Neanderthal DNA in genomes.) But if they were at least 800,000 years ago against people and neanderthals, it is surprising that they were still able to get together just 60,000 years ago, Ramirez Rozzi said. .
"In other words, almost 1 million The evolution of the year was not enough to identify obstacles (genetic, endocrinological, behavioral, etc.) to distinguish these two types? "
Gomez-Robles, who is a" well-known specialist in Neanderthal dental morphology, "puts this argument well. said Bruno Maureille, Research Director at the National Research Center (CNRS), in Paris, which was not included in the study
However, it seems that the different peanuts of the Neanderthals in Europe have "their own peculiarities," said Maureille, "Live Science." "Can we just try to draw such a global scenario?" [I’m] not sure. "
The study was published online on May 16 in the Science Advances magazine
Originally published in Live Science [