” Snakes are basically extremely customized lizards,”stated co-author Dr. Roy Ebel, a scientist at the Museums Victoria Research Institute.

“Sometime in the age of dinosaurs, one lizard family tree lost its limbs and extended its body. The essential concern is why.”

” For more than a century, a number of concepts have actually taken on each other. “

“One states the very first snakes colonized the water, with a long, limbless body fit for swimming, just like an eel.”

“A 2nd states they resided on the surface area of the land, amongst leaf litter and greenery, where minimized limbs might have alleviated their motion through thick ground cover.”

“A 3rd states they holed up, losing their limbs and lengthening their bodies to pursue a head-first burrowing way of life, just like contemporary blind snakes.”

“The problem is that the proof has actually rested on a small handful of fossils. Less than 10 early snake skeletons are understood from that period.”

In their research study, Dr. Ebel and associates analyzed an incredibly maintained skull and postcranial product of a formerly unidentified types of stem snake.

Called Tametara mirimthe reptile resided in what is now Brazil throughout the Late Cretaceous date, approximately 85 to 75 million years earlier.

The fossil was discovered in 2020 at a quarry near Presidente Prudente in the Brazilian state of São Paulo.

The specimen is the very first articulated snake fossil ever discovered in Brazil, and among just a handful of three-dimensionally maintained snake fossils from the Mesozoic period throughout the world.

What sets Tametara mirim apart is the amazing information maintained in its skull.

Utilizing high-resolution CT scanning, the paleontologists rebuilded the animal’s brain, cranial nerves and inner ear in extraordinary information, producing what they refer to as the most total photo yet of brain anatomy in a stem snake.

Their restoration exposed a brain shape unlike that of any other early snake or any snake alive today, recommending even more variation in brain structure– and most likely sensory capability– throughout snake development than researchers had actually formerly acknowledged.

Dr. Ebel and co-authors matched the brain information with an analysis of the fossil’s bone microstructure, a method that can expose an animal’s way of life from the density and density of its skeleton.

Both lines of proof pointed separately to the exact same conclusion: Tametara mirim was a burrowing animal.

“Head-first burrowers develop denser, thicker bone in the skull roofing,” Dr. Ebel stated.

“This characteristic has actually separately progressed throughout various burrowing lizard family trees.”

“We presume this combines the skull versus the stress applied throughout its usage as a digging tool.”

Tametara mirim programs precisely this quality mix,” he stated.

“In reality, our way of life restoration places the fossil amongst the most specialised head-first burrowers living today, and well away from any lizards and snakes that pursue a more generalist way of life.”

“But the skull roofing was not our only line of proof.”

“We likewise digitally reconstruct its brain cavity, the most comprehensive such restoration yet for any early snake.”

“This cavity would have carefully matched the shape of the brain in the living animal.”

“The decreased visual centres and streamlined forebrain point the exact same method the bones do: underground.”

The holotype of Tametara mirimImage credit: Simões et aldoi: 10.1038/ s41586-026-10809-9.