Thailand's 'Last Titan': Scientists Unveil 27-Metre Sauropod That Rivals a Blue Whale

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An international team led by researchers at University College London, Mahasarakham University and Sirindhorn Museum has formally described Nagatitan chaiyaphumensis, a new long-necked sauropod whose remains were eroding out of the bank of a community pond in Chaiyaphum province. The paper appeared in the journal Scientific Reports on 15 May 2026 and proposes that the animal weighed between 25 and 28 tonnes and stretched roughly 27 metres from nose to tail.

The fossils came from the Khok Kruat Formation, the youngest dinosaur-bearing rock unit known in Thailand. Because younger layers in the region preserve marine sediments rather than continental fauna, the team nicknamed the new species the 'last titan' of Southeast Asia. They classified it within Euhelopodidae, a sauropod family until now known almost entirely from China and Mongolia, suggesting that Asian titanosauriform diversity stretched much farther south than previously thought.

The discovery began in 2007 when local villagers reported strange rocks that resembled bone fragments. Excavations over more than a decade recovered vertebrae, ribs, pelvic elements and a single humerus measuring 1.78 metres long. Comparing that humerus with related species allowed the team to estimate the animal's body mass with reasonable confidence.

For Thailand, Nagatitan is the 14th formally named dinosaur and the largest by a wide margin. For palaeontology more broadly, it confirms that long-necked giants of the Early Cretaceous were geographically widespread and ecologically successful right up to the moment Southeast Asia disappeared beneath a shallow sea.

formally described: given an official scientific name and full description

eroding: being worn away slowly by wind or water

formation: a body of rock with a similar age and origin

marine sediments: layers of mud and sand laid down under the sea

vertebrae: the bones that make up the spine

humerus: the long bone of the upper arm or front leg

titanosauriform: belonging to a group of very large long-necked dinosaurs

ecologically successful: well suited to its environment and widespread

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An international consortium of palaeontologists has formally erected Nagatitan chaiyaphumensis in Scientific Reports, anchoring the first sauropod ever recovered from Thailand's Lower Cretaceous Khok Kruat Formation and, by some margin, the largest dinosaur described from Southeast Asia. Phylogenetic analyses place the animal within Euhelopodidae, a clade of titanosauriform sauropods whose hitherto China- and Mongolia-restricted distribution now extends nearly 2,000 kilometres south, reshaping conceptions of how Cretaceous long-necked herbivores radiated across the eastern margin of Pangaea.

Recovered material includes cervical and dorsal vertebrae, partial ribs, pelvic elements and a near-complete left humerus measuring 1.78 metres. Allometric scaling of the humerus against well-known close relatives such as Euhelopus and Phuwiangosaurus yields a body length of approximately 27 metres and a mass estimate between 25 and 28 tonnes, figures consistent with the upper end of euhelopodid morphospace and roughly equivalent to a small blue whale.

The taxonomic significance is matched by a chronostratigraphic punchline. The Khok Kruat Formation is the youngest non-marine dinosaur-bearing unit in the Khorat Group; succeeding strata are dominated by marine carbonates deposited as a Tethyan epicontinental sea inundated the region during the Albian–Cenomanian transgression. Nagatitan, the authors argue, represents a terminal pulse of Southeast Asian terrestrial megafauna immediately preceding that marine drowning — hence the evocative epithet 'last titan'.

Beyond its size, the discovery foregrounds an underappreciated continuity between Sundic and East Asian sauropod assemblages and supplies an unusually complete body-size proxy in a region where titanosauriform material has historically been fragmentary. The authors note that fortuitous community reporting — a villager's observation in 2007 — initiated the multi-decadal recovery, an instructive reminder that the most consequential vertebrate palaeontology of the early 21st century continues to begin at the intersection of local knowledge and institutional fieldwork.

phylogenetic: relating to the evolutionary history and relationships of species

clade: a group of organisms sharing a common ancestor

radiated: spread and diversified across regions or habitats

allometric scaling: estimating one body measurement from another using proportional relationships

morphospace: the range of possible shapes and sizes a group of organisms occupies

chronostratigraphic: concerning the age relationships of rock layers

transgression: the advance of the sea across previously dry land

fortuitous: happening by chance, often in a fortunate way

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Thailand's 'Last Titan': Scientists Unveil 27-Metre Sauropod That Rivals a Blue Whale

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