A monumental new species of long-necked dinosaur, the largest ever discovered in Southeast Asia, has been identified by an international team of scientists from fossils unearthed in northeastern Thailand. The colossal herbivore, named Nagatitan chaiyaphumensis, stretched an astonishing 27 meters in length and weighed 27 tonnes, comparable to the mass of nine adult Asian elephants.
The findings, published in the journal Scientific Reports, detail how the sauropod roamed the Earth between 100 and 120 million years ago. This places it roughly 40 million years before the reign of Tyrannosaurus rex, while being approximately twice the size of that famed predator. The fossils were originally discovered a decade ago beside a pond in Chaiyaphum province, but only now has the full significance of the giant been revealed.
A Mythological Moniker for a Prehistoric Giant
The dinosaur’s scientific name carries deep cultural and geographical significance. “Naga” references a mythical serpent from Southeast Asian folklore, while “titan” alludes to the powerful gods of Greek mythology. The species name, chaiyaphumensis, honors the Thai province where the bones were found. This marks the 14th dinosaur to be named from Thailand, a country rapidly emerging as a hotspot for fossil diversity.
Lead author Thitiwoot Sethapanichsakul, a Thai doctoral student at University College London (UCL), described the creature as “the last titan” of Thailand. This poignant title stems from the geological context of the find. The fossils were located in the country’s youngest dinosaur-bearing rock formation, as later periods saw the region submerged under a shallow sea, making further large discoveries unlikely.
“Younger rocks laid down towards the end of the time of the dinosaurs are unlikely to contain dinosaur remains because the region by then had become a shallow sea,” Sethapanichsakul explained. “So this may be the last or most recent large sauropod we will find in Southeast Asia.”
Surviving and Thriving in a Hothouse World
Beyond its staggering size, Nagatitan provides crucial data for understanding dinosaur physiology during a period of intense global heat. The creature lived during an era of rising atmospheric carbon dioxide and high global temperatures. Researchers are intrigued by how such a massive body, which naturally retains heat, managed to thrive.
Study co-author Professor Paul Upchurch of UCL noted the apparent paradox to National Geographic. “It seems a little odd that sauropods were able to cope with higher temperature conditions,” he said, given that large bodies are harder to cool down. He suggested to Reuters that the key may lie in the food supply, stating it is “likely that the high temperatures had an impact on the plant fodder that was important to sauropods, which were very large-bodied herbivores.”
The discovery not only adds a giant to the dinosaur family tree but also fulfills a lifelong dream for its lead researcher. Sethapanichsakul, a self-confessed “dinosaur kid,” said the study “fulfils a childhood promise of naming a dinosaur.”
Palaeontologist Dr. Sita Manitkoon from Mahasarakham University highlighted the broader significance for the region, stating that Thailand is “possibly the third most abundant in Asia in terms of dinosaur remains,” underscoring the country’s rich and still largely untapped prehistoric heritage.
