A massive tyrannosaur may have roamed the floodplains of what we now call New Mexico around 74 million years ago. A team of paleontologists from the University of Bath, Montana State University, and the New Mexico Museum of Natural History and Science made this exciting discovery.
The lead researcher, Dr. Nicholas Longrich, notes that tyrannosaurs were among the last and largest of predatory dinosaurs. After the extinction of other carnivorous dinosaurs, they grew in size and became the top predators during the late Cretaceous in both North America and Asia. By the Late Campanian period, different groups of tyrannosaurs, such as Albertosaurinae and Daspletosaurini, weighed between 2 and 3 tons.
This evolution eventually led to the appearance of the giant Tyrannosaurus rex, one of the last and largest of its kind. The paleontologists studied a large tibia, or shinbone, from the Kirtland Formation in New Mexico. This bone measured 96 cm in length and 12.8 cm in diameter, suggesting it belonged to a creature weighing around 4 to 5 tons.
They believe this finding represents the oldest giant tyrannosaur from North America, potentially being an early example of the Tyrannosaurini group, which includes Tyrannosaurus rex and its Asian relatives. The tibia shows features similar to later tyrannosaurs, making this discovery significant.
Experts in the field note that this find could reshape our understanding of how and where giant tyrannosaurs first evolved. Some scientists argue that they emerged in Asia before migrating to North America, while others suggest they originated in what was known as Laramidia, a massive landmass in western North America.
This new fossil supports the idea that large tyrannosaurs evolved earlier than previously thought. As they concluded, the unusual size of this tyrannosaur highlights the unique dinosaur diversity in Laramidia and shows a distinct separation between smaller and larger predatory species in the region.
This discovery sheds light on the fascinating history of dinosaurs and how they adapted to their environments. Understanding these ancient creatures helps us grasp not just their evolution but also the ecological dynamics of their time. For more in-depth research on dinosaurs, you can explore this link from the Natural History Museum.
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