Washington: A University of Alberta researcher has identified 4 dinosaur species.
Victoria Arbour visited dinosaur fossil collections from Alberta to the UK, examining skull armour and comparing those head details with other features of the fossilized ankylosaur, a family of squat, armour plated, plant eaters, remains.
Arbour made a breakthrough that resurrected research done more than 70 years ago.
She explained that between 1900 and 1930 researchers determined that small variations in the skull armour and the tail clubs in some ankylosaurs constituted four individual species of the dinosaurs.
Arbour said that in the 1970s the earlier work was discarded and the four species were lumped into one called species Euoplocephalus.
She asserted that she examined many fossils and found that she could group some fossils together, as their skull armour corresponded with a particular shape of their tail club.
She said that finding common features in fossils that come from the same geologic time is evidence that the original researchers were right.
Arbour said that there were in fact 4 different species represented by what scientists previously thought was only one species, Euoplocephalus.
The four species span a period of about 10 million years and Arbour`s research shows that three of those ankylosaurs species lived at the same time in what is now Dinosaur Provincial Park in southern Alberta.
The research has been published in the journal PLOS ONE.