The fossil remains of a new species of marine dinosaur has been uncovered.
The fossilised remains of a crocodile that ruled the oceans 140 million years ago have been discovered in Patagonia.
Scientists have nicknamed the creature Godzilla, because of its dinosaur-like snout and jagged teeth.
The US-Argentine team of researchers believes the animal was a ferocious predator, feeding on other marine reptiles and large sea creatures.
The species is formally known as Dakosaurus andiniensis and has been unveiled in the journal Science.
Unlike modern crocodiles, it lived entirely in the water, and had fins instead of legs. It measured 4m (13ft) from nose to tail and its jaws alone were a third of a metre (foot-and-a-half) long.
Crocodiles evolved during the late Permian and became widespread during the Cretaceous (146 to 65 million years ago).
Other marine crocodiles alive then had long, slim snouts and needle-like teeth, which they used to catch small fish and molluscs. But this creature had a dinosaur-like snout and large, serrated teeth.
"These sorts of features are also present in carnivorous dinosaurs like Tyrannosaurus rex," said co-researcher Diego Pol, of Ohio State University in Columbus, US.
"It shows a really unexpected morphology that nobody thought could be present in a marine crocodile."
Gee, that's really imaginative calling a big dinosaur with sharp teeth 'Godzilla'. What will they think of next?
13ft isn't that big really. There are plenty of horror crocs swimming around in the NT.
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