A newly discovered genus and species of pseudoarchosaur has been revealed from fossils found in southern Brazil.
Taingraqaskus Bellator inhabited the area now known as Brazil during the Triassic period around 240 million years ago.
This ancient predator measured about 2.4 m (8 ft) in length and weighed approximately 60 kg.
The back of this species featured bony plates called osteoderms, a characteristic also seen in modern crocodilians.
Utilizing their long necks and agile movements, these predators quickly captured prey with swift, precise actions, employing their slender jaws filled with sharply curved teeth to secure their catch and prevent escape.
Dr. Rodrigo Temp Muller, a paleontologist at the Federal University of Santa Maria, stated, “This creature was an active predator, but despite its considerable size, it was not the largest hunter within its ecosystem, which included giants reaching up to 7 meters (23 feet) long.”
Taingraqaskus Bellator was part of the pseudostia — ancestors of modern crocodiles and alligators.
According to Dr. Temp-Müller, “Pseudostia were a diverse group capable of tackling tough prey, along with smaller hunters adept at catching swift animals.”
“It may resemble a dinosaur, yet Taingraqaskus Bellator does not belong to that classification.”
“One of the most evident distinctions from dinosaurs lies in its pelvic structure, where the hip and femoral joints exhibit significantly different characteristics.”
“The discovery of Taingraqaskus Bellator highlights the intricate ecosystem of the time, showcasing various pseudospecies with distinct sizes and hunting methods filling specific ecological roles.”
“This find uncovers crucial phases in life’s history that predate the arrival of dinosaurs.”
A partial skeleton of Taingraqaskus Bellator was located in Dona Francisca, southern Brazil, in May 2025, with its lower jaw, spinal column, and pelvic girdle preserved.
Although the limbs were not found, experts speculate that, like its relatives, it moved on all fours.
“The discovery of Taingraqaskus Bellator provides further evidence of an ancient link between Brazil and Africa during the Triassic period, a time when the continents were fused into the supercontinent Pangea,” said Dr. Temp Muller.
“Despite the variety of pseudonesters, some lineages are extremely rare in the fossil record, leading to a limited understanding of them.”
“The fossils underwent meticulous preparation in the lab, carefully removing surrounding rock.”
“Upon revealing the anatomical details, it became apparent that the specimen represented a previously unknown species, which was incredibly exciting for us.”
“We found a species closely related to a predator, Mandasucus Tanyauchen, discovered in Tanzania.”
“This link between South American and African fauna can be contextualized within Triassic paleogeography.”
“During this period, continents were still connected, allowing life to disperse freely across regions that are now separated by oceans.”
“Consequently, the Brazilian and African faunas share numerous commonalities, reflecting intertwined evolutionary and ecological narratives.”
Taingraqaskus Bellator would have thrived in the same environment where the first dinosaurs arose, in areas adjacent to vast arid deserts.
“Our findings indicate that southern Brazil’s reptiles had already developed diverse communities adapted to various survival strategies.”
“Moreover, this discovery unveils that such diversity is not an isolated phenomenon.”
This research is detailed in the following article: paper published in Journal of Systematic Paleontology.
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Rodrigo Temp Muller and others. Osteology, taxonomy, and phylogenetic relationships of a new pseudoarchosaur from the Middle Triassic of southern Brazil. Journal of Systematic Paleontology, published online on November 12, 2025. doi: 10.1080/14772019.2025.2573750
Source: www.sci.news
