clock menu more-arrow no yes

Filed under:

'Godzilla' of the seas preyed on dinosaurs

The skull fossil of a Dakosaurus andiniensis, known as Godzilla, left, found in Argentina, and a digitized model of the marine crocodile, right.
The skull fossil of a Dakosaurus andiniensis, known as Godzilla, left, found in Argentina, and a digitized model of the marine crocodile, right.
Associated Press

Scientists have nicknamed it Godzilla, but it really belongs in another movie, this one not yet made: "Jaws Meets Jurassic Park."

The creature, whose discovery is being announced online Thursday on the Web site of the journal Science, is a large sea-dwelling crocodile that lived 135 million years ago, in the middle of the dinosaur era. Unlike most crocodiles today, this one possessed a snout that was short and stout, like that of Tyrannosaurus rex, and its foot-and-a-half-long jaws held 13 large teeth with sawtooth edges — the type that tear chunks of flesh out of other large creatures.

"I'm sure it wasn't nice," said Diego Pol, a researcher at the Mathematical Biosciences Institute at Ohio State University who is a member of the research team. "A top predator role in the food chain."

Perhaps a dozen or more feet long, the crocodile was not the largest of all crocodiles, nor was it the only one that swam the seas. But it is notable for being so sharply distinct from other crocodiles, which have a long, slender snout and a mouthful of 30 or more small sharp teeth, useful for catching fish.

"It's like a crocodile with a dinosaur head on it," said James M. Clark, a professor of biology at George Washington University who was not involved in the research. "This is something really new and unusual. In the realm of fossil marine crocodiles, it's a big deal."

Mark A. Norell, curator of paleontology at the American Museum of Natural History, said that this crocodile could have filled an ecological niche similar to that of modern-day killer whales.

Pol said it probably preyed on other marine reptiles like ichthyosaurs, which looked like dolphins, and plesiosaurs, which were long-necked, slow-swimming animals.

Paleontologists have known about crocodiles living in the oceans since the 1800s, when their fossils were uncovered in Europe. Some had even evolved flippers and a fishlike tail.

The research, financed by the National Geographic Society, was led by Zulma Gasparini, a paleontologist at the National University of La Plata in Argentina. Gasparini uncovered a complete, intact fossil skull of the new species, named Dakosaurus andiniensis, in the Patagonia region of Argentina in 1996. The Science paper culminates nine years of study, including preparing the fossil by removing the surrounding rock.

Despite its unusual shape, the 13-inch-long skull possessed telltale features like the shape of the nostrils, eye sockets and the roof of the mouth that indicated it was a crocodile. A detailed comparison by Pol with other marine crocodiles of the time indicated that the new species resembled a group with the flippers and fishlike tail.

At the time that Dakosaurus lived, the area where the fossil was found was far to the north and far underwater, at the bottom of a deep tropical bay connected to the Pacific Ocean.