Paleontologists in Brazil have uncovered an exceptionally well-preserved fossil of a 80-million-year-old ancient snake adapted to a subterranean (fossorial) lifestyle. The newly described species has been named Tametara mirim.

Representing one of the most complete early snake skeletons discovered to date, the specimen preserves the posterior skull, lower jaw, and the first 103 vertebrae. Utilizing high-resolution computed tomography (CT) scanning, researchers digitally reconstructed the reptile's brain morphology, inner ear structure, and cranial nerve pathways.

The generic name Tametara originates from Tupi-Guarani languages, translating to "steelyard balance" due to a prominent sagittal crest on the skull, while the species identifier mirim means "small"—reflecting the creature's compact body length of approximately 40 centimeters.

Structural analysis indicates that Tametara mirim possessed heavily ossified skull bones engineered to withstand mechanical load while burrowing headfirst through soil. This discovery challenges the long-held hypothesis that snakes lost their limbs solely as a reaction to a single specialized environment (such as purely aquatic or subterranean habitats), demonstrating instead that the limbless body plan served as a versatile evolutionary adaptation for exploiting diverse ecological niches.