A prehistoric predator that looked like a big crocodile paddled around the Antarctic region 240 million years ago, sporting sizable fangs not only along the edge of its mouth but also halfway down the roof of its mouth.

The newly described freshwater species, Kryostega collinsoni, is a temnospondyl, a once-diverse but extinct group of amphibians that lived during the Triassic period, when dinosaurs first showed up. Temnospondyls are extinct cousins of modern salamanders and frogs.

This one was probably about 15 feet in length with a long and wide skull even flatter than a crocodile's.