description Dilong paradoxus Overview
Dilong paradoxus is a small, early tyrannosauroid theropod from Lower Cretaceous rocks of northeastern China, dating to roughly 130 million years ago. Fossils preserve simple filamentous integumentary structures, providing direct evidence that early members of the broader tyrannosaur lineage possessed a feather-like covering. The animal is significant to paleontologists studying the early evolution, body covering, and ancestry of later tyrannosaurids.
help Dilong paradoxus FAQ
Did Dilong have feathers?
Yes, fossils of Dilong paradoxus preserve simple filamentous integumentary structures — essentially proto-feathers — around the jaw and tail regions. This provided the first direct evidence that early members of the tyrannosauroid lineage had feather-like body coverings, long before giant tyrannosaurs like T. rex appeared.
How big was Dilong compared to Tyrannosaurus rex?
Dilong paradoxus was a small theropod estimated at roughly 1.5 to 2 meters in length, making it dramatically smaller than Tyrannosaurus rex, which reached over 12 meters. Its small size is consistent with the pattern that early tyrannosauroids were modest predators before some lineages evolved enormous body size.
Where was Dilong paradoxus discovered?
Dilong was discovered in the Yixian Formation in Liaoning Province of northeastern China, a Lower Cretaceous deposit famous for its exceptionally preserved feathered dinosaur fossils. The discovery was reported by a team led by the paleontologist Xu Xing in 2004.
Is Dilong a direct ancestor of T. rex?
Dilong paradoxus is an early basal member of the Tyrannosauroidea — the broader superfamily that includes T. rex — rather than a direct ancestor. It demonstrates that key tyrannosauroid traits were present tens of millions of years before T. rex evolved.
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