The News
Fossil bridges horned-dinosaur gap
By The Associated Press
Article Last Updated: 03/03/2007 11:09:44 PM MST
Cleveland - A new dinosaur species was a plant-eater with yard-long horns over its eyebrows, suggesting an evolutionary middle step between older dinosaurs with even larger horns and the small-horned creatures that followed, experts said.
The dinosaur's horns, thick as a human arm, are like those of triceratops - which came 10 million years later. However, this animal belonged to a subfamily that usually had bony nubbins a few inches long above their eyes.
Michael Ryan, curator of vertebrate paleontology for the Cleveland Museum of Natural History, published the discovery in this month's Journal of Paleontology. He dug up the fossil six years ago in southern Alberta, Canada, while a graduate student for the University of Calgary.
"Unquestionably, it's an important find," said Peter Dodson, a University of Pennsylvania paleontologist. "It was sort of the grandfather or great uncle of the really diverse horned dinosaurs that came after it."

The Research
Read the research behind this story in the Journal of Paleontology.