Paleontologists Debate the Origin of Tyrannosaurus Rex
There is ongoing debate among paleontologists regarding the origin of one of the most famous dinosaurs, Tyrannosaurus rex. While some argue that its ancestry can be traced back to North America, others believe that its ‘grandparents’ may have migrated from Asia to North America.
A recent study led by paleoecologist Cassius Morrison from University College London suggests that the direct ancestors of T. rex may still be undiscovered in Asia. This finding challenges previous research that suggested a North American origin for large-bodied tyrannosaurs.
The study utilized modeling techniques based on the fossil record, dinosaur evolutionary tree, and data on climate and geography to trace the migration patterns of tyrannosaurids and megaraptors across continents. The team proposes that while the T. rex genus likely originated in western North America, its direct ancestors migrated from Asia to North America during the Late Campanian – Early Maastrichtian period.
Furthermore, the research highlights the emergence of megaraptors in Asia around 120 million years ago, before dispersing to Europe and Gondwana. The findings suggest that megaraptors evolved into apex predators in regions like Australia and Patagonia, while tyrannosaurids grew to gigantic sizes to replace other large predators that went extinct.
The study, published in Royal Society Open Science, sheds new light on the evolutionary history of Tyrannosaurus rex and its relatives, challenging previous assumptions about their origins.
This research opens up new avenues for understanding the evolution and migration patterns of dinosaurs during the Mesozoic era, providing valuable insights into the origins of iconic species like Tyrannosaurus rex.
