Nagatitan Chaiyaphumensis: The Largest Dinosaur Found in Southeast Asia

Researchers have identified a new species of giant sauropod dinosaur in Thailand, a discovery that provides new insights into the evolution of massive herbivores during the Early Cretaceous period. The species, named Nagatitan chaiyaphumensis, is estimated to be the largest dinosaur ever discovered in Southeast Asia.

The fossilized remains were first located in 2016 by Thanom Luangnan, a resident of Thailand’s Chaiyaphum Province, who discovered the bones on the banks of a public pond. The specimens were found within the Khok Kruat Formation and subsequently reported to the country’s Department of Mineral Resources. The discovery marks the 14th unique dinosaur species identified in the region since 1986.

Physical Characteristics and Classification

The newly described genus belongs to the euhelopodid family of sauropods. Based on the analysis of the excavated remains—which include several vertebrae, portions of the pelvis and parts of the forelimbs and hindlimbs—paleontologists estimate the creature reached lengths of approximately 27 meters (89 feet). The dinosaur’s mass is estimated to be between 27 and 30 tonnes.

Thitiwoot Sethapanichsakul, a lead author and PhD student in the Earth Sciences department at University College London (UCL), noted that while the species is significantly larger than dinosaurs such as Diplodocus carnegii, it remains smaller than other known giants like Patagotitan. The naming of the genus, Nagatitan, combines a reference to the “Nāga,” a mythical serpentine figure in Asian folklore, with the term “titan” to reflect its immense scale.

Evolutionary and Environmental Context

The discovery, which was detailed in the journal Scientific Reports, offers evidence regarding the environmental conditions that allowed such massive animals to develop. The research suggests that the warm, open, and relatively dry habitats present during the Aptian–Albian ages of the Early Cretaceous created ideal conditions for the evolution of giant sauropods.

Sita Manitkoon, a paleontologist at Mahasarakham University, stated that initial measurements of the bones suggested the specimen could be the largest dinosaur ever found in Southeast Asia. The study highlights how shifts in ancient vegetation and climate may have facilitated the rise of these colossal herbivores.

Research Collaboration and Institutional Status

The identification of N. Chaiyaphumensis was the result of a collaborative effort involving researchers from University College London, Mahasarakham University, Suranaree University of Technology, and the Sirindhorn Museum. The study involved analyzing the holotype specimen, which consists of several bone fragments recovered from the Khok Kruat Formation.

The fossil material is currently housed in the Sirindhorn Museum, where it has been permanently accessioned as specimens SM2025-1-546 through SM2025-1-556.