SAO POLESINE: Scientists in Brazil announced the discovery of one of the world`s oldest fossils believed to belong to an ancient reptile dating back some 237 million years that could help explain the rise ofthe dinosaurs.

Named Gondwanax paraisensis, the four-legged reptile species was roughly the size of a small dog with a long tail, or about 1meter long and weighingbetween 3 and 6 kg, the scientists said in a statement on Monday.

The small reptile would have likely roamed the land of what is today southern Brazil, when the world was much hotter.

The fossil has been identified as a new silesaurid, an extinct group of reptiles. Paleontologists debate whether silesaurids were true dinosaurs or possibly a precursor to the creatures thatonce dominated the Earth.

`Understanding the characteristics of these precursors could shed light on what was crucial for the dinosaurs` evolutionary success,` the statement said.

Unearthed in a rock layer dating back to the Triassie period, between 252 million and 201 million years ago, the Gondwanax paraisensis fossil comes from the time when dinosaurs as well as mammals, crocodiles, turtles and frogs first arose.

In 2014, physician Pedro Lucas Porcela Aurelio found the fossil in the town of Paraiso do Sul in Brazil`s southernmost Rio Grande do Sul state.

He donated it to a local university in 2021, kicking off three years of research.

`Being the first human to touch something from 237 million years ago is extraordinary,` Aurelio said.-Reuters