Level 1 — Absolute Beginner

Scientists found a new kind of dinosaur. It lived a very long time ago. The bones are in Thailand. Thailand is a country in Asia. The dinosaur is huge.

A man saw funny rocks near a pond. He told other people. Then scientists came. They dug for many years. They found big, old bones.

The dinosaur has a long neck. It has a long tail. It eats plants. It is about as long as a school bus and bigger. It weighs about twenty-seven tonnes.

The name of the dinosaur is Nagatitan. Naga is a big snake from old stories. Titan means giant. The dinosaur is the biggest one ever found in this part of Asia.

dinosaur

A very big animal that lived a very long time ago.

Thailand

A country in Southeast Asia.

pond

A small lake with calm water.

bone

A hard white part that gives an animal its shape.

neck

The part of the body between the head and the shoulders.

tail

The long thin part at the back of an animal.

huge

Very, very big.

tonne

A heavy weight equal to about 1,000 kilograms.

Level 2 — Elementary

Scientists in Thailand have described a brand new kind of dinosaur. It is called Nagatitan chaiyaphumensis. The bones were first found by a villager named Thanom Luangnan in 2016. He noticed strange-looking rocks near the edge of a public pond in Chaiyaphum Province, in the northeast of the country.

Researchers dug at the site for almost ten years. They put the bones together and studied them. The team includes scientists from University College London, Mahasarakham University, Suranaree University of Technology, and Thailand's Sirindhorn Museum. They published their results in the journal Scientific Reports in May 2026.

Nagatitan is a sauropod, which means it is a long-necked plant-eating dinosaur. It is about twenty-seven metres long and weighed around twenty-seven tonnes. That makes it the largest dinosaur ever found in Southeast Asia. It lived more than one hundred million years ago, during the Early Cretaceous Period.

The name combines 'Naga', a legendary serpent from Thai and Southeast Asian mythology, with 'Titan', the giant beings of Greek mythology. The species name honors Chaiyaphum Province, where the fossils were found. Scientists say the discovery helps explain how giant sauropods spread across Asia during this period.

villager

A person who lives in a small country town.

fossil

The remains or marks of a living thing that died very long ago.

sauropod

A long-necked plant-eating dinosaur, sometimes very large.

Cretaceous

A period of Earth history about 145 to 66 million years ago.

myth

An old story that explains the world or names something powerful.

serpent

A large snake, often in old stories.

species

A particular kind of animal or plant.

publish

To make a piece of writing or research available to the public.

Level 3 — Intermediate

A team of palaeontologists has formally described a colossal new long-necked dinosaur unearthed from a public pond in northeastern Thailand. Named Nagatitan chaiyaphumensis, the animal weighed roughly twenty-seven tonnes and measured about twenty-seven metres from snout to tail, making it the largest dinosaur ever discovered in Southeast Asia. The description appears in the journal Scientific Reports and was led by researchers from University College London, Mahasarakham University, Suranaree University of Technology, and Thailand's Sirindhorn Museum.

The fossils first surfaced in 2016, when a local villager named Thanom Luangnan noticed unusually shaped rocks protruding from the muddy banks of a pond in Chaiyaphum Province. Excavation continued for nearly a decade, eventually yielding cervical and dorsal vertebrae, a partial pelvis, and several limb elements that allowed the team to place the animal taxonomically among the somphospondylan titanosauriforms — the family of dinosaurs that includes the largest land animals ever to walk Earth.

Crucially, Nagatitan dates from the Lower Cretaceous Khok Kruat Formation, roughly one hundred and ten million years old. Until now, somphospondylan diversity in Southeast Asia during this interval had been represented mainly by Phuwiangosaurus, a much smaller relative. The new species pushes back the regional record of true giants by tens of millions of years and challenges the prevailing view that the gigantic body sizes of titanosaurs were achieved primarily in South America.

The genus name combines 'Naga,' the serpent deity of Thai and broader Southeast Asian mythology that appears in temple architecture from Angkor Wat to Bangkok's Wat Phra Kaew, with 'Titan,' the divine forerunners of the Greek Olympian gods. The species epithet honors Chaiyaphum Province. Lead author Sita Manitkoon described the discovery as 'a moment when Thai palaeontology stops being a footnote and becomes a chapter,' and the team is already searching adjacent quarries for related specimens.

palaeontologist

A scientist who studies fossils and ancient life.

vertebrae

The bones that make up a backbone or spine.

pelvis

The set of bones at the base of the spine that supports the hips.

taxonomically

In the way scientists classify living things into groups and species.

formation

A named layer of rock laid down during a specific time.

diversity

The variety of different kinds of organisms in a place.

epithet

A descriptive name added to identify a species, person, or thing.

quarry

A pit where rock, stone, or fossils are dug from the ground.

Level 4 — Advanced

A multinational team of palaeontologists has formally erected Nagatitan chaiyaphumensis, a new somphospondylan titanosauriform from the Lower Cretaceous Khok Kruat Formation of Chaiyaphum Province, northeastern Thailand. The taxon is reconstructed at approximately twenty-seven metres in axial length and twenty-seven tonnes in body mass, immediately becoming the largest non-avian dinosaur yet recovered from Southeast Asia and one of the largest documented somphospondylans outside the South American titanosaur radiation. The description, published in Scientific Reports under lead author Sita Manitkoon, draws on cervical and anterior dorsal vertebrae, a partial right pubis, the proximal half of a left femur, and several caudal centra.

The provenance is unusually folkloric for a piece of formal phylogenetic systematics: the holotype material was first noticed in 2016 by a local villager, Thanom Luangnan, who flagged a cluster of unusually shaped fragments protruding from the silted bank of a rural fishpond. Subsequent salvage excavations by the Sirindhorn Museum and Mahasarakham University ran for roughly nine field seasons, and the resulting bone bed yielded, in addition to the holotype, several isolated elements consistent with at least one additional sub-adult individual. The depositional setting is interpreted as a low-energy fluvial floodplain that periodically experienced overbank deposition and channel avulsion, conditions that selectively preserved articulated postcranial elements while disarticulating cranial material.

Phylogenetically, Nagatitan resolves as a basal somphospondylan more derived than the Thai endemic Phuwiangosaurus sirindhornae but less crownward than the South American titanosaur cohort that includes Argentinosaurus, Patagotitan, and Notocolossus. That intermediate position is significant: it implies that gigantic body sizes were not the exclusive product of South American biogeography but were also achieved, at least once and possibly more, in the Asian Cretaceous. The result joins recent reassessments of Ruyangosaurus from Henan, China, in pushing back the temporal and geographic distribution of true sauropod giants.

The genus name fuses 'Naga,' the serpentine guardian of Hindu-Buddhist mythology embedded in Thai temple iconography from Sukhothai to Bangkok's Wat Phra Kaew, with 'Titan,' the pre-Olympian deities of Greek cosmogony. The species epithet honors Chaiyaphum Province. Manitkoon characterized the discovery in remarks to NPR as 'the moment when Thai palaeontology stops being a footnote and becomes a chapter,' and the team has indicated that additional sub-adult and possibly juvenile material from the same site will be the subject of follow-up descriptions in the coming twelve to eighteen months.

axial length

Total length measured along the spine from snout to tail.

phylogenetic systematics

The science of grouping organisms by their evolutionary relationships.

holotype