The dinosaur named "Sue," a 41-foot-long Tyrannosaurus rex, is shown on display at the Field Museum in Chicago, Illinois in this May 17, 2000 file photo
The dinosaur named "Sue," a 41-foot-long Tyrannosaurus rex, is shown on display at the Field Museum in Chicago, Illinois in this May 17, 2000 file photo. The 67 million-year-old dinosaur discovered near Faith, South Dakota, was named for Susan Hendrickson, who unearthed the giant creature. The hot question of whether dinosaurs were warm-blooded like birds and mammals or cold blooded like reptiles, fish and amphibians finally has a good answer. Dinosaurs, for eons Earth's dominant land animals until being wiped out by an asteroid 65 million years ago, were in fact somewhere in between. REUTERS

Two species of dinosaurs were discovered in a Canadian museum. The dinosaur species were discovered by a British palaeontologist, Dr Nick Longrich, while he was studying fossils.

According to the Daily Mail, Longrich, from the Department of Biology and Biochemistry at the University of Bath, was examining fossilised bones that had been in the Canadian Museum of Nature for 75 years. While examing bones from two horned dinosaurs, he found that they resembled dinosaurs from the American south west, suggesting they were new species. Previously, they were classified as Anchiceratops and Chasmosaurus, species from Canada.

Longrich said that one of the dinosaurs represented a new species of Pentaceratops called Pentaceratops aquilonius. It was a buffalo-sized dinosaur that ate plants from over 75 million years ago. Pentaceratops were smaller cousins of a group of large, horned dinosaurs called the Chasmosaurinae which belonged to the Triceratops species. The Chasmosaurinae had long brow horn and elongated frills and were based in western North America towards the end of the Cretaceous period.

To date, 10 species of Chasmosaur have been discovered from the Cretaceous period, with the species occuring in both, the northern as well as southern parts of the continent. Longrich said that though the two distinct provinces existed, there was contact between them.

He said that the second dinosaur was like a species of Kosmoceratops, which is a dinosaur with an ornate skull from Utah. He added that more complete fossils were required to confirm the information.

He continued that the new dinosaur species were much diverse than what it was previously thought. He said that they had thought that they had discovered most of the species, but now it seemed like there were many dinosaurs that were not discovered as well.

According to Longrich, the dinosaur diversity must have been very high. He thinks that they had just scratched the surface with a few of the findings. He added that dinosaurs would diverge to form new species as the spread from one part of the continent to the other. He continued that the distribution of the species was different when compared to the patters in living mammals.