This is the fifth coelurosaur
that has been discovered at the Shishugou Formation, a geological site from where diverse species of dinosaur specimens have been recovered.
Today's event screened a segment from Discovery Channel's upcoming special WHEN DINOSAURS ROAMED AMERICA, which presents the new Coelurosaur and Nothronychus for the first time and depicts a time period that, in North America, has never before yielded dinosaur skeletons.
Following preparation of a second specimen with assistance from the Discovery Channel, Wolfe, Kirkland and their colleagues determined that the bones were not of a raptor species, as originally thought, but rather of a new Coelurosaur perhaps close to the origins of both Dromaeosaurus (raptors) and oviraptors.
This horned and frilled dinosaur, like the Coelurosaur and Nothronychus, lived during a time paleontologists call the Cretaceous Gap in the Cretaceous period (105-75 million years ago), from which scientists have found no identifiable dinosaur fossils in America.
The group used information from Chinese fossils to reconstruct the new Coelurosaur from the remains of two individuals.
The original Coelurosaur ancestor may have looked a lot like this new find did.
From his studies of the earliest known bird, Archaeopteryx, Ostrom recognized various anatomical similarities between the ancient bird and a group of bipedal dinosaurs called coelurosaurs.
Although many paleontologists at the time viewed dinosaurs as clumsy and cold-blooded, Ostrom theorized that coelurosaurs and other theropod dinosaurs were agile, warm-blooded predators.
The new species also sits deep within the evolutionary tree of theropods, much more so than coelurosaurs
, meaning that the species that stem from Sciurumimus are likely to have similar characteristics.
9in) to 80cm in length, belong to dinosaur types including tyrannosaurs, coelurosaurs