It fulfills a kind of childhood promise—that someday I would name a dinosaur.
Nagatitan chaiyaphumensis weighed 27 tons and measured 27 meters long, making it twice the size of other known sauropods in Thailand and far larger than a T-rex. Bones discovered in 2016 at a pond in northeastern Thailand were analyzed using 3D scanning, revealing a previously unknown herbivorous species from 120-100 million years ago.
- Nagatitan chaiyaphumensis weighed 27 metric tons and measured 27 meters long
- Bones discovered in 2016 at a pond in northeastern Thailand; excavations continued through 2024
- Lived 120-100 million years ago during the Early Cretaceous period
- Twice the size of other known sauropods in Thailand; largest dinosaur ever found in Southeast Asia
Researchers identified a new colossal sauropod dinosaur species in Thailand, named Nagatitan chaiyaphumensis, weighing 27 metric tons and measuring 27 meters long—the largest dinosaur ever found in Southeast Asia.
A decade ago, a local resident walking along a community pond in northeastern Thailand spotted something unusual jutting from the earth during the dry season—bones, weathered and ancient, waiting to be understood. That discovery would eventually lead paleontologists to name a creature that had never been formally identified before: Nagatitan chaiyaphumensis, a sauropod so massive it dwarfs nearly everything that came before it in Southeast Asian fossil records.
The bones themselves told an extraordinary story of scale. The front leg bone alone—the humerus—stretched nearly six feet long, taller than the man who would eventually lead the research team. Thitiwoot Sethapanichsakul, a doctoral student at University College London, remembers the moment he first saw it. The sheer size was disorienting. When the full skeleton was pieced together through careful excavation and three-dimensional scanning between 2016 and 2024, the numbers became almost incomprehensible: 27 metric tons, 27 meters from nose to tail tip. To put that in perspective, a large Tyrannosaurus rex—the dinosaur most people imagine when they think of prehistoric giants—weighed between 4,000 and 6,800 kilograms and stretched just over 40 feet. Nagatitan was roughly twice the size of other sauropods already known from Thailand, and it belonged to a family of herbivores that were, quite simply, the largest animals ever to walk the earth.
The research team—drawn from University College London, Thailand's Department of Mineral Resources, and two Thai universities—examined leg bones, vertebrae, ribs, and pelvis fragments. The analysis revealed not just a new species, but one that challenged assumptions about the diversity of giant dinosaurs in the region. Sethapanichsakul and his colleagues published their findings in Scientific Reports, giving the creature a name layered with meaning. "Naga" references a mythological serpent from South and Southeast Asian folklore, creatures traditionally associated with water—fitting, given that the bones emerged from a pond. "Titan" invokes the giants of Greek mythology and the animal's staggering proportions. "Chaiyaphumensis" simply marks the Thai province where it was found.
For Sethapanichsakul, who grew up in Thailand, naming this dinosaur fulfilled something deeper than academic achievement. "It fulfills a kind of childhood promise," he said. "That someday I would name a dinosaur. And I wanted it to be from Thailand." The creature lived during the Early Cretaceous, somewhere between 120 and 100 million years ago, in an environment that was hot and dry. It would have shared its world with smaller herbivorous dinosaurs similar to iguanodons, and with early ceratopsians—the distant ancestors of Triceratops. The landscape itself was a winding river system populated by freshwater fish, sharks, crocodiles, and turtles.
Thailand's fossil record, Sethapanichsakul believes, represents one of Asia's richest repositories of dinosaur diversity. The reason lies in geology: thick layers of sedimentary rock from the Mesozoic Era, laid down between 252 and 66 million years ago, are exposed across the region with relatively little rainfall or vegetation to erode them away. Those protective conditions have allowed bones to survive intact, waiting for someone to find them. A research center has been established at the excavation site, and a full-scale reconstruction of Nagatitan chaiyaphumensis now stands in the Thainosaurus Museum in Bangkok—a monument to what patience, careful observation, and a childhood dream can unearth.
Citações Notáveis
When I saw the humerus for the first time, it was taller than me, and that was quite surprising.— Thitiwoot Sethapanichsakul, lead researcher and paleontologist
Thailand possesses one of the greatest diversities of dinosaur fossils in Asia, in part due to thick layers of Mesozoic sedimentary rock exposed to less rain and vegetation.— Thitiwoot Sethapanichsakul
A Conversa do Hearth Outra perspectiva sobre a história
When that local resident found those bones by the pond, did they know what they'd stumbled onto?
Almost certainly not. They were just walking during the dry season when the water level dropped, and something caught their eye. It took years of careful study—3D scanning, comparative analysis, collaboration between Thai and British researchers—to understand what they'd found.
Why does Thailand have so many dinosaur fossils compared to other parts of Asia?
It's really about the rocks. Thailand has these thick layers of sedimentary stone from the Mesozoic era, and they're exposed in a way that the climate doesn't destroy them. Less rain, less vegetation means the bones survive. It's almost accidental geology—but it's made the region a window into a lost world.
The researcher, Sethapanichsakul—this seems personal for him.
It is. He's from Thailand, and he grew up dreaming of naming a dinosaur. To do it with a species from his own country, and to weave in the mythology of his culture—the naga serpent—that's not just science. That's homecoming.
What was it like for him to see that humerus for the first time?
Disorienting. The bone was taller than he was. You can read the papers and understand the measurements, but standing in front of something that massive, something that belonged to an animal twice the size of anything else known from that region—that's a different kind of knowing.
Does this change what we thought we knew about Southeast Asian dinosaurs?
It suggests the diversity was far greater than the fossil record had shown us. And it hints that there's probably much more still buried in those sedimentary layers, waiting for the next dry season, the next person walking by a pond.