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By the close of the Cretaceous, however, Asia sported a large theropod fauna of tyrannosaurids and other large coelurosaurs that was similar to faunas in North America, but drastically different from those on the southern continents (Africa, South America, India, Madagascar, Australia).
Similarly, there is only limited evidence that tyrannosaurids and other derived coelurosaurs, the dominant large theropods of the Campanian-Maastrichtian of Laurasia, developed large body size and filled the apex predator niche earlier in time.
Finally, among more traditional predatory coelurosaurs, there are few obvious examples of non-tyrannosaurid taxa obtaining large body size during the Late Cretaceous of Asia.
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.
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.
Whereas the functional implications of tail size can be elucidated, the adaptive significance of caudal reduction in terrestrial coelurosaurs is less clear.
Combined with the elongated forelimbs of coelurosaurs (these are thought to have allowed them to grab and hold prey), students may come to visualize that a transition to eating flying insects might have favored the evolution of leaping with the aid of feathered forelimbs and, ultimately, to powered flight (Garner et al.
9in) to 80cm in length, belong to dinosaur types including tyrannosaurs, coelurosaurs and hadrosaurs.