Siamraptor is a key member of the Carcharodontosaurus group, meaning that the plasma represents a very early evolutionary tear from the rest of the pack. The study reports differences in its anatomy from similar dinosaurs – including a cavity in its jaw and a small hole in the cervical and posterior dorsal vertebra from the base of the nerve spine.
Soki Hattori, a research author and professor at Japan's Fukui Prefecture University, told Popular science by email, that it took about six years to convert the findings into a document recognizing the new genealogy.
To date, only 12 species of dinosaurs have been discovered in Thailand, with Siamraptor being the largest, says Chokchaloemwong. Even more fascinating is the fact that this species has been discovered in Southeast Asia – a long way from the earliest fossils of Carcharodontosauria in Africa and Europe. Scientists are not sure how this species ends up in Thailand, but we note that similar dinosaurs had spread to different parts of the world.
"Therefore, it expands our knowledge of the distribution of this group, which includes the largest livestock that has ever existed, in time and space," says Hattori.
Going forward, researchers will continue to dig in the area, looking for more clues about the creatures that lived there and how exactly they reigned over the landscape.