In May 2026, a team of international researchers announced a groundbreaking discovery. Scientists identified a new species of colossal sauropod named Nagatitan chaiyaphumensis, which now holds the title of the largest dinosaur ever discovered in Southeast Asia.
This massive plant-eater lived during the Early Cretaceous period, roughly 100 to 120 million years ago. According to a scientific report written by Thitiwoot Sethapanichsakul et al., its name, "Naga", refers to the serpent-like creature in various Southeast Asian folklore. It often associated with water and Buddhism.
Furthermore, "titan" nods to the giant deities of Greek mythology, and "chaiyaphumensis" marks the Chaiyaphum province where its remains lay hidden for eons.
A Giant Dinosaur of SEA
The journey to identify Nagatitan began ten years ago when a local resident stumbled upon a pile of giant bones at the edge of a communal pond during a dry season. From 2016 to 2024, teams from University College London (UCL), Mahasarakham University, and other Thai institutions meticulously excavated the site.
The team recovered a significant portion of the skeleton, including vertebrae, ribs, parts of the pelvis, and a 1.78-meter leg bone.
Nagatitan reached a scale that is difficult to fathom. Researchers estimate the giant weighed approximately 27 tonne, roughly the same as nine adult Asian elephants.
It stretched to a length of 27 meters, making it as long as a modern blue whale. While it dwarfed famous dinosaurs like Diplodocus, it remained smaller than global heavyweights like the 60-tonne Patagotitan.
Scientists classify Nagatitan as a somphospondylan titanosauriform, a group of long-necked herbivores that eventually led to some of the largest land animals to ever exist.
The "Last" Titan of Thailand
What sets Nagatitan apart from its cousins are several unique skeletal features, known as autapomorphies. Most notably, its middle and posterior dorsal vertebrae exhibit two distinct shapes in a specific bone structure called the hyposphene.
In the middle of its back, this structure is triangular, but it transforms into a vertical ridge toward the rear. It also possesses triangular "aliform processes" on its vertebrae, a feature researchers have not observed in any other sauropod. These anatomical details prove that Nagatitan was a distinct lineage, separate from other local species like Phuwiangosaurus.
Nagatitan roamed a world defined by rising carbon dioxide levels and high global temperatures. Its home in northeastern Thailand consisted of semi-arid plateaus and meandering river systems.
This environment likely supported a diverse ecosystem where Nagatitan shared its habitat with freshwater sharks, crocodiles, and other herbivorous dinosaurs. Prof. Paul Upchurch of UCL notes that while large bodies typically retain heat, these sauropods successfully navigated high-temperature conditions, possibly due to the specific plant fodder available at the time.
Moreover, researchers often refer to Nagatitan as "the last titan" of Thailand. It is because the fossils come from the Khok Kruat Formation, the youngest dinosaur-bearing rock formation in the country.
