Afraid carnivorous dinosaur the size of a bus with sharp claws recognized as a new species
A wild carnivorous dinosaur the size of a bus that killed its prey until death has been recognized as a new species 30 years after its remains were unearthed in Utah.
Scientists discovered remains of carnivores Jimmadseni allosaurus , Which toured the flood plains of North America 155 million years ago, in 1990.
A study of the bones of A. jimmadseni It has been published in PeerJ after seven minute years dedicated to preparing the bones for analysis.
The 4,000-pound beast reached lengths of up to 29 feet and, like the Tyrannosaurs rex, ran on two legs.
However, studies of the new remains revealed that A.jimmadseniThe longer arms would have made him an even better hunter than the notoriously bloodthirsty Tyrannosaurus Rex.
Allosaurus jimmadseni, a spectacular horned and crested dinosaur the size of a bus that cut and shattered its prey to death, was excavated in the Badlands of Utah
“Recognizing a new species of rock dinosaur that has been intensively researched for more than 150 years is an outstanding discovery experience,” said Dr. Daniel Chure, a retired paleontologist at the National Dinosaur Monument in northeastern Utah and co-author on the study.
WHAT ARE THE THREE GEOLOGICAL ERAS?
The Mesozoic Era is the name given to the period from 250 million to 65 million years ago.
The era is divided into three main periods: Triassic, Jurassic and Cretaceous.
The new species discovery dates back to the Cretaceous period, 145 million to 66 million years ago.
Mesozoic was the age of dinosaurs and lasted almost 180 million years.
The Mesozoic Era followed the Paleozoic Era, during which arthropods, molluscs, fish and amphibians evolved.
Mesozoic was followed by the Cenozoic Era, during which the continents assumed the configuration we know today.
‘Jimmadseni allosaurus it’s a great example of how much more we have to learn about the world of dinosaurs. “
A.jimmadseni it is geologically the oldest species belonging to the Allosaurus genus, translated as ‘different reptile’, from the Jurassic and Cretaceous periods.
This new species of the genus had 80 teeth and three sharp claws at the end of each arm to cut and eat other dinosaurs.
Scientists believe it would have been the apex predator in the ecosystem of the time.
Adults hunt by overwhelming their prey, possibly in small groups.
The fully arranged bone study showed that it had several unique features, including a narrow skull with low facial ridges that extend from the horns in front of the eyes.
Previously, paleontologists thought there was only one kind of Allosaurus in Jurassic North America – the Allosaurus fragilis.
But the study has revealed A.jimmadseni evolved at least five million years before his cousin A. fragilis – which was first described in 1877.
Artist’s impression of the species Allosaurus jimmadseni that attacks juvenile sauropods
Both species differ in their skeletal details, which is why A.jimmadseni It has been described as a new species altogether.
‘The skull of Jimmadseni allosaurus is more lightly constructed than its posterior relative Allosaurus fragilis, which suggests a different feeding behavior between the two, “said lead co-author Professor Mark Loewen of the Utah Museum of Natural History.
However, the head of the new dinosaur was flatter and weaker than A. fragilis, and had a worse view, with a narrower field of vision, which suggests that he had more difficulty catching his prey.
Assembled skeleton of the Allosaurus jimmadseni at the Dinosaur National Monument in Utah
The comparison of the bones indicates Jimmadseni allosaurus it had a superior jaw and unique cheeks, while a decorative crest extended from its horns to the eyes, just in front of the nose.
“This exciting new study illustrates the importance of continuing paleontological research on public lands in the West,” said Dr. Brent Breithaupt, regional paleontologist at the Land Administration Office, Cheyenne, Wyoming.
“The discovery of this new dinosaur taxon will provide important information about the life and times of the Jurassic dinosaurs and represents another unique component of the United States heritage.”
Sketches of the skull of Allosaurus jimmadseni. The new discovery is much rarer than its descendant Allosaurus fragilis, and they differ in their skeletal details.
A.jimmadseni they inhabited the alluvial plains of western North America during the late Jurassic period, evolving about 155 million years ago, at least five million years before Allosaurus fragilis.
Paleontologists say A. jimmadseni He would have lived in the semi-arid floodplains of the Morrison Formation throughout western interior of North America, including land that is now part of Utah, Colorado and Wyoming.
The first Morrison Formation dinosaurs were replaced by some of the most famous dinosaurs of the late Jurassic, including Diplodocus Y Stegosaurus.
The almost complete skeleton of the new species has been presented at the Utah Museum of Natural History.
Paleontologist James Madsen Jr assembles a skeleton composed of Allosaurus from the Cleveland-Lloyd dinosaur quarry
Professor Madsen Jr maps Allosaurus bones in the Cleveland-Lloyd dinosaur quarry in Utah
In 1990, George Engelmann of the University of Nebraska, Omaha, initially discovered the initial skeleton of the new species within the Dinosaur National Monument, a national park that borders Colorado and Utah and preserves a large number of dinosaur fossils.
Six years after the collection of the headless skeleton, Ramal Jones of the University of Utah discovered the radioactive skull that belonged to the skeleton.
A. jimmadseni Named after Utah state paleontologist James H Madsen Jr, who died in 2009 after digging and studying tens of thousands of Allosaurus bones.