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A Brazilian scientist has identified fossils of a small crocodile-like reptile that lived during the Triassic Period several million years before the first dinosaurs.
The fossils of the predator, called Parvosuchus aurelioi, include a complete skull, 11 vertebrae, the pelvis and some limb bones, according to palaeontologist Rodrigo Muller of the Federal University of Santa Maria in Rio Grande state, author of the research published in the journal Scientific Reports.
Parvosuchus, which lived about 237 million years ago, walked on four legs and was about three feet (one metre) long, preying on smaller reptiles.
The fossils were unearthed in southern Brazil. Parvosuchus, which means ‘small crocodile’, belonged to an extinct family of reptiles called the Gracilisuchidae that until now was known only from Argentina and China.
“The Gracilisuchidae are very rare organisms in the fossil world,” Muller said. “This group is particularly interesting because they lived just before the dawn of the dinosaurs. The first dino- saurs lived 230m years ago.”
Parvosuchus was a terrestrial predator. Gracilisuchidae represents one of the earliest branches of a lineage known as Pseudosuchia that later included the crocodile branch.
Parvosuchus lived at a time of evolutionary innovation in the aftermath of Earth’s worst mass extinction 252m years ago, with multiple groups of reptiles competing before dinosaurs eventually became dominant.
The last undisputed members of the Gracilisuchidae died out about 7m years before the first dinosaurs.
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