Allosaurus Coloring Page – The meat-eating dinosaur the size of a bus, Allosaurus Jimmadseni, was officially recognized as a new species 30 years after its fossils were found in Utah, United States
. The dinosaur, discovered in 1990, roamed the plains of North America about 155 million years ago.
A study of Allosaurus Jimmadseni’s bones has been published in PeerJ, after which experts spent seven years analyzing them. The lead author of the study, Daniel Chure, explained that the new species was found in the rocks.
“Recognizing a new species of dinosaurs in rocks that have been investigated intensively for more than 150 years is an extraordinary discovery experience,” said he, who is also a retired paleontologist from Utah’s Dinosaur National Monument, as quoted by the Daily Mail page, last weekend.
The 4,000-pound carnivore is 29 feet (8.8 meters) long. Like the Tyrannosaurus rex, this giant ran on two legs but had longer arms which made Allosaurus Jimmadseni a better hunter. The name of the new species was given by Utah paleontologist James H Madsen Jr, who died in 2009 after excavating and studying tens of thousands of Allosaurus bones.
The Jimmadseni Allosaurus fossil is a good example of a find to learn more about the dinosaur world. Geologically, this dinosaur is the oldest species belonging to the genus Allosaurus — a distinct reptile — from the Jurassic and Cretaceous periods.
This species has 80 teeth and three sharp claws at the end of each arm to cut and eat other dinosaurs. “It will be a top predator in the ecosystem by then,” said Chure.
Studies show that the animal has several unique body parts, including a narrow skull with a low, elongated face with horns on it.
Previously, Chure had thought that there was only one Allosaurus species in North America: Allosaurus Fragilis. But this study reveals Allosaurus Jimmadseni evolved at least five million years before its cousin Allosaurus Fragilis, whose fossils were first discovered in 1877.
The two species differ in their skeletal details, which is why Allosaurus Jimmadseni has been described as an entirely new species.
“Allosaurus Jimmadseni’s skull is lighter than that of Allosaurus Fragilis, which shows different feeding behavior between the two,” said co-author Mark Loewen of the Natural History Museum of Utah.
The new dinosaur’s head was flatter and weaker than Allosaurus fragilis. It also has poorer eyesight, with a narrower field of view, indicating that it has a harder time catching its prey.
Bone comparisons show that Allosaurus Jimmadseni had a unique upper jaw and cheeks, while a decorative horn stretched out right in front of the dinosaur’s nose. Paleontologist Brent Breithaupt said the new study is quite interesting because it illustrates the importance of continued paleontological investigations.
“The discovery of this new dinosaur taxon will provide important information about the life and timing of the Jurassic dinosaurs and represent another unique component that existed in America,” said Breithaupt.