Aublysodon: Research Database Tyrannosauroidea? (Theropoda) · Late Cretaceous (~68–66 MYA) · North America — USA, Montana, Wyoming (Hell Creek Formation) Research Note: Aublysodon was a small tyrannosauroid theropod from the latest Cretaceous Hell Creek Formation of western North America. As one of the few known small tyrannosauroids from the very end of the Age … Read more
Alectrosaurus: Research Database Tyrannosauroidea (Theropoda) · Late Cretaceous (~70 MYA) · Asia — Mongolia (Nemegt Formation) Research Note: Alectrosaurus was a tyrannosauroid theropod from the Late Cretaceous Nemegt Formation of Mongolia. As an early tyrannosauroid, it provides important data on the evolutionary history of tyrannosaurs before the rise of tyrannosaurids. Research Finding Status … Read more
Alioramus: Research Database Tyrannosauridae (Theropoda) · Late Cretaceous (~70–66 MYA) · Asia — Mongolia (Nemegt Formation) Research Note: Alioramus was a tyrannosaurid theropod from the latest Cretaceous of Mongolia — a smaller, more gracile relative of Tyrannosaurus rex distinguished by its elongated skull and multiple rows of horns on the snout. Its unusual cranial … Read more
In Depth When Appalachiosaurus was first discovered it raised more than a few eyebrows because it was discovered in the Eastern United States. Up until that point only one other genus of tyrannosaur named Dryptosaurus had been found in the eastern half of the USA. The one specimen of Appalachiosaurus appears to have been a … Read more
In Depth Moros is a genus of primitive tyrannosauroid that lived in North America during the earlier stages of the Late cretaceous. The holotype fossils of Moros date from the Cenomanian of the Cretaceous, meaning that the discovery of these has turned back the clock on the first known appearance of a definitive tyrannosaur in … Read more
In Depth Aviatyrannis was for lack of a better word tiny, although this small size is actually a hallmark of tyrannosaur ancestry. Although incomplete, the fossil remains of Aviatyrannis are very similar to another ancient tyrannosaur, Stokesosaurus, from North America. This has resulted in speculation that Aviatyrannis is actually a junior synonym of Stokesosaurus, and … Read more