Fossils of new species of horned dinos found in Utah

The creatures lived on the "lost continent" of Laramidia in the Late Cretaceous period, some 68 to 99 million years ago.

Laramidia was formed when a shallow sea flooded part of what is now North America and separated the eastern from the western parts.

The newly found dinos lived in the subtropical swampy environment about 100km from the seaway that split the ancient continent in two.

They were close relatives of the dinosaur Triceratops, and belonged to the family known as ceratopsians. "Ceratops" means "horned face" in Greek.

Although both species had a number of horns on their heads, the bigger one, dubbed Utahceratops gettyi, had a particularly large horn over the nose.

Mark Lowen, one of the authors of the study, said that the dinosaur resembled "a giant rhino with a ridiculously supersized head".

The second animal was named Kosmoceratops richardsoni and with a total of 15 horns on its head, it is the most ornate-headed dinosaur discovered to date.

"Kosmoceratops is one of the most amazing animals known, with a huge skull decorated with an assortment of bony bells and whistles," said Scott Sampson from the Utah Museum of Natural History, the study's lead author.

The scientist explained that despite a possibly horrendous appearance, it is doubtful that these dinosaurs used their horns in self-defence.

"Most of these bizarre features would have made lousy weapons to fend off predators," said Dr Sampson.

"It's far more likely that they were used to intimidate or do battle with rivals of the same sex, as well as to attract individuals of the opposite sex."

The dinosaurs were found in the desert landscape of Grand Staircase-Escalante National Monument (GSENM), in south-central Utah - a vast tract of land Dr Sampson called "one of the country's last great, largely unexplored dinosaur boneyards".

When the Western Interior Seaway, a warm, shallow sea that existed in the Late Cretaceous, flooded what is now North America, the ancient continent got divided into Appalachia and Laramidia.

About the size of Australia, Laramidia was a rather small landmass, made up of what is now the US states of Montana, Wyoming, Utah, New Mexico, Alaska, western Texas, and the Canadian provinces of Alberta and Saskatchewan.

Over the past few months, palaeontologists have discovered a number of different species of horned dinosaurs.

"The new Utah creatures are the icing on the cake, showing anatomy even more bizarre than typically expected for a group of animals known for its weird skulls," said Andrew Farke of the Raymond Alf museum in Claremont, California, another of the paper's authors.

Dr Sampson agreed, adding that now was "an exciting time to be a palaeontologist." Kazinform cites BBC. See www.bbc.co.uk for full version