Scientists have analyzed an 80 million-year-old [1] snake fossil from Brazil that shows early snakes adapted to burrowing and diverse environments.
The discovery of the specimen, named Tametara mirim, provides critical evidence regarding how reptiles lost their limbs. By understanding where these animals lived, researchers can better trace the evolutionary path that led to the modern snake body plan.
The fossil was recovered from a Cretaceous deposit in Brazil [1, 2]. Using CT-scan analysis, researchers identified specific adaptations for burrowing, which indicates that early snakes were not limited to a single environment. Instead, the evidence suggests these creatures inhabited underground, terrestrial, and marine settings [1, 3].
This find is particularly rare because of the nature of the fossil record. There are fewer than 10 [4] known articulated Mesozoic snake fossils. Most fossils from this era are fragmentary, making the exceptionally preserved state of Tametara mirim a vital resource for paleontologists.
The study helps explain the broader transition from limbed lizards to the limbless forms seen today. This evolutionary shift allowed snakes to exploit niches that were inaccessible to their ancestors, such as tight underground tunnels or deep ocean floors.
While there are more than 4,000 [5] living snake species today, their origins remain a subject of intense scientific debate. The ability of early species to diversify across multiple habitats suggests that the loss of limbs was an adaptive advantage for navigating various terrains rather than a limitation.
Researchers said the fossil's preservation allows for a detailed look at the skull and brain cavity, further confirming the animal's specialized lifestyle during the Late Cretaceous period [1, 3].
“Early snakes inhabited underground, terrestrial, and marine environments.”
The discovery of Tametara mirim challenges the notion that snake evolution followed a single, linear path. By proving that early snakes occupied three distinct environments—land, sea, and underground—the find suggests that limblessness was a highly flexible trait that enabled rapid diversification. This helps scientists bridge the gap between legged lizards and the diverse array of modern serpents.
