More T-Rex Cousins

Two new species of predatory megaraptoran dinosaurs have been identified from fossils found in Thailand. The two new species, named Phuwiangvenator yaemniyomi and Vayuraptor nongbualamphuensis, roamed the Earth approximately 125 million years ago (Cretaceous period). The fossilized remains were found in the Sao Khua Formation of Thailand.

Both creatures belong to Megaraptora (megaraptors), a group of medium-to-large-sized theropod dinosaurs. The relatives of this group of predatory dinosaurs include Tyrannosaurus Rex. Like T-Rex, they ran on their hind legs, but the tyrant lizard, their arms were strong and armed with long claws. They also had more delicate heads that ended in a long snout.

Phuwiangvenator yaemniyomi was likely a fast runner. At about 20 feet (6 m) long, this dinosaur was considerably smaller than T-Rex which was approximately 40 feet (12 m) in length. Vayuraptor nongbualamphuenisis measured approximately 15 feet (4.5 m) long.

Scientists have compared the Thai fossils with other megaraptors discovered in South America and Australia. Various characteristics of Phuwiangvenator yaemniyomi indicate that it is an early representative of the group. This is an indication that the megaraptors originated in Southeast Asia and then spread to other regions.

The study was published in the journal Acta Palaeontologica Polonica.