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The species belongs to the allosauroids, a group of small to large-bodied, two-legged carnivorous dinosaurs that lived during the Jurassic and Cretaceous periods, and has been unveiled at the Natural History Museum of Utah.Previously, paleontologists thought there was only one species of Allosaurus in Jurassic North America."This study shows there were two species the newly described Allosaurus jimmadseni evolved at least five million years earlier than its younger cousin, Allosaurus fragilis," said co-lead author Mark Loewen, research associate at the Natural History Museum of Utah.Allosaurus jimmadseni is distinguished by a number of unique features, including low crests running from above the eyes to the snout and a relatively narrow back of the skull with a flat surface to the bottom of the upper skull under the eyes.At 155 million years old, Allosaurus jimmadseni is the geologically-oldest species of Allosaurus, predating the more well-known State Fossil of Utah Allosaurus fragilis.Allosaurus jimmadseni was the most common and the top predator in its ecosystem. It had relatively long legs and tail, and long arms with three sharp claws."The skull of Allosaurus jimmadseni is more lightly built than its later relative Allosaurus fragilis, suggesting a different feeding behaviour between the two," he added in a paper published in the open-access scientific journal PeerJ.George Engelmann of the University of Nebraska, Omaha initially discovered the initial skeleton of the new species within Dinosaur National Monument in 1990.In 1996, several years after the headless skeleton was collected, the radioactive skull belonging to the skeleton was made using a radiation detector by Ramal Jones of the University of Utah.Allosaurus jimmadseni lived on the semi-arid Morrison Formation floodplains of the interior of western North America."Discovery of this new taxon of dinosaur will provide important information about the life and times of Jurassic dinosaurs and represents another unique component of America's Heritage," said Brent Breithaupt, regional paleontologist at the United States Bureau of Land Management (BLM).( With inputs from IANS )

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