World’s largest known horned dinosaur unearthed

November 29th, 2007 - 2:05 pm ICT by admin  

Washington, Nov 29: Paleontologists have found the world’s largest known horned dinosaur, with the discovery of an early relative of Triceratops that measured around 30 feet in length.
The bones of this dinosaur were excavated at Horseshoe Canyon Formation in Dry Island Buffalo Jump Provincial Park in central Alberta, Canada, by Royal Tyrrell scientists and researchers from the Canadian Museum of Nature.
The previous record-holder was Pentaceratops sternbergi, which hailed from what is now New Mexico.
The new dinosaur, Eotriceratops (”early Triceratops”) xerinsularis, is the earliest known confirmed relative of the rhino-like Triceratops, which was slightly smaller in size, with the largest specimens measuring just over 29 feet in length.
“The skull of Eotriceratops alone was as big as a car,” David Eberth, who co-authored a paper on the find in a recent Canadian Journal of Earth Sciences, told Discovery News.
After extensive analysis and bone assembly, the Canadian team now knows what the new dino looked like when it was alive.
Like Triceratops, it possessed two orbital bone horns that jutted out above its eyes. Each would have been 5 feet long. Also, a smaller, pyramid-shaped, horn stuck out from its nose.
The beast also had what Eberth described as “a standard issue Triceratops frill” at the back of its head. The Triceratops frill, however, had little toothy spikes that poked out on top. These spikes were “more flattened and spindle-like” in Eotriceratops.
The new dinosaur preceded its more famous relative by a million years. Until its discovery, not much was known about dinosaurs from Alberta and North America 69 to 67 million years ago, so it fills an important gap.
“If this specimen is truly an early relative of Triceratops, it gives us insight into how this group of animals evolved over time,” Eric Lund, a University of Utah paleontologist told Discovery News. “It fills an information gap between early and late chasmosaurines, an animal group that included both long and short frilled species. Members of this group typically were plant eaters that probably used their frills for mating and territorial displays,” he added.
Before the new find, scientists theorized that dinosaurs gradually became bigger over time. Now that theory is under question, since size changes, probably induced by environmental and climactic conditions, didn’t always follow distinct patterns. (ANI)

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