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An artist's rendering shows a previously unknown species of crocodile-like “super salamander” that roamed the Earth more than 200 million years ago. University of Edinburgh researchers say the species discovered in Portugal was among the Earth’s top predators.UNIVERSITY OF EDINBURGH, JOANA BRUNO/The Associated Press

Fossil remains of a previously unknown species of a crocodile-like "super salamander" that grew as long as a small car and was a top predator more than 200 million years ago have been found in southern Portugal, researchers announced Tuesday.

The species grew up to two metres in length and lived in lakes and rivers, University of Edinburgh researchers said.

The team said the species, given the name Metoposaurus algarvensis, was part of a wider group of primitive amphibians that were widespread at the time but became extinct. They are the ancestors of modern amphibians such as frogs, and are believed by paleontologists to have lived at the same time the dinosaurs began their dominance.

Steve Brusatte of the University of Edinburgh's School of GeoSciences, who led the study, said the new species, which had hundreds of sharp teeth, is "weird compared to anything today."

It was at the top of the food chain, feeding mainly on fish, but it was also a danger for newly appeared dinosaurs and mammals that strayed too near the water, Brusatte said.

The team says the find establishes that this group of amphibians lived in a more diverse geographic area than had been thought.

The dig began in 2009 and took several years. The "super salamander" bones were uncovered in a half-metre-thick layer of rock in a hillside that is "chock-full" of bones, Brusatte said. The team hopes to raise funds to continue excavating the site.