PARIS: Scientists have been classifying dinosaurs as either bird or reptile hipped since 130 years, but the new view for their classification could reshape the family tree. On Wednesday, scientists presented the view that the evolutionary history of dinosaurs could be determined by the shape of their pelvis which uprooted their family tree.
Paul Barrett of London’s Natural History Museum said: “Our study overturns 130 years of dogma.” He added that we had our analysis suggest that T. Rex were more closely related to Stegosaurus.
According to a report published in the journal Nature, the dinosaur’s evolutionary tree had been uprooted by the scientists in which the two base group’s bird and reptile-hipped were now mixed.
The old family tree had two major groups: the bird-hipped ornithischian dinosaurs (such as duck-billed dinosaurs and stegosaurs) and the reptile-hipped saurischians, which include the theropods (such as Tyrannosaurus rex) and the sauropods (the long-necked, long-tailed herbivorous giants).
The new analysis proposed that theropods and ornithischians were more closely related and both fit into a previously unknown group called Ornithoscelida.
This new aspect had uprooted the family tree and the whole aspect about the dinosaur evolution had been changed.
The new change might seem small but it had a wide range effect and uprooted the whole family tree.
The report had also suggested that dinosaurs aroused some ten million years earlier than thought. The new aspect claimed that they aroused around 247 million years ago in the northern hemisphere rather than the south.
The scientists concluded that the first dinosaur was a small omnivore that walked on its hind legs and also grasping hands. The new aspects had changed the aspects and raised new lines of scientific debates.
Dinosaurs were split into two categories called the bird-hipped and reptile-hipped. The new study proposed that three-horned Triceratops and armored Stegosaurus, which were categorized as bird-hipped dinos had not suitable for the given two categories. The given dinos had been sub-divided into a new category, called Ornithoscelida.
The new category that had been formed could be described as “bird-limed.” The members of this category had common hind-limb as well as skull features.
Among the scientists, who conducted the study, Baron said that “We propose that the dinosaur family tree actually looks very different from the version that has been accepted by scientists for the last 130 years.”
For the very first time in the history of science, the reptile-hipped theropods had been grouped with bird-hipped dinosaurs.
Barron also added: “We expect people in our field to test and retest our hypothesis and seek out new specimens and new data that may prove or disprove what we are proposing.”
Baron’s colleague David Norman said that if the conclusions were correct, then all the major text-books on the evolution of the vertebrates would need to be rewritten.