When fossil experts first clapped eyes on the skull, it was clearly from a strange, horned dinosaur. When they noticed how stunted the bony horns were, its nickname, Hellboy, was assured.
The near-complete skull of the 70 million-year-old beast was spotted by chance 10 years ago, protruding from a cliff that runs along the Oldman River south of Calgary in Alberta, Canada.
After it was excavated, cleaned up and measured, the fossilized remains have now been identified as a relative of the three-horned triceratops, and the first example of a horned dinosaur to be found in that region of North America.
Photo: Reuters
Like triceratops, the new species was a herbivore. However, it sported a more impressive shield, or frill, at the back of its skull, decorated with large triangular and pentagonal plates.
The extraordinary features led researchers to name the new species Regaliceratops peterhewsi, a reference to the impressive crown-like frill, and to Peter Hews, a Calgary-based geologist who first spotted part of the skull jutting from the rockface in 2005.
Researchers came up with the Hellboy nickname long before they had liberated the full skull from the cliff face. The main reason was that the rock the fossil was embedded in was incredibly hard, making excavation a hellish, and years-long, task. That job was made even tougher because the Oldman River is a protected fish-breeding ground, meaning the scientists had to erect a dam at the site to prevent debris from the excavation falling into the river.
“It was a coincidence, but when we noticed that the skull had these short horns over the eyes, that really solidified the nickname,” Caleb Brown at the Royal Tyrrell Museum of Paleontology in Alberta said.
In the Hellboy comics and movies, the eponmymous demon grinds his horns to stumps with an electric sander to help him fit in with mere mortals.
However, the horns of the dinosaur tell a more interesting story. Triceratops belonged to a group of horned dinosaurs called chasmosaurines. These had a small horn over the nose and two larger horns over the eyes. And while regaliceratops is definitely a chasmosaurine, it has a long nose horn and puny horns over its eyes. These features, opposite to those characteristic of triceratops, are seen in a different group of horned dinosaurs, called centrosaurines, which were extinct by the time regaliceratops came along.
The bizarre mix of features is an example of convergent evolution, where one species evolves bodily characteristics that arose separately in other species through the course of prehistory. Brown and his colleague, Donald Henderson, describe the creature’s remains in Current Biology.
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