Nagatitan chaiyaphumensis Identified as the Largest Dinosaur in Southeast Asia

May 15, 2026, 16:57

Introduction

An international team of researchers has officially described a new species of sauropod dinosaur, called Nagatitan chaiyaphumensis, which was discovered in northeastern Thailand.

Main Body

The identification of Nagatitan chaiyaphumensis was the result of a collaboration between several universities and the Sirindhorn Museum. By analyzing skeletal remains, including the ribs, pelvis, and a large arm bone, researchers determined that the dinosaur was about 27 meters long and weighed between 25 and 28 tonnes. According to the study published in Scientific Reports, this makes it the largest dinosaur ever found in Southeast Asia. This dinosaur lived during the Early Cretaceous period, roughly 100 to 120 million years ago, in a subtropical environment with winding rivers. This ecosystem was home to various animals, including crocodiles and other plant-eating dinosaurs. While there were large predators in the area, an adult Nagatitan was much heavier than any predator, which likely protected it from being hunted. In terms of its family tree, Nagatitan belongs to a group of Asian dinosaurs known for having air sacs in their bones to reduce their weight. The lead researcher, Thitiwoot Sethapanichsakul, described the species as the 'last titan' of the region because the land later became a shallow sea, making it impossible for these dinosaurs to survive. Furthermore, Professor Paul Upchurch suggested that the massive size of these dinosaurs might have been caused by the high global temperatures and carbon dioxide levels of that era.

Conclusion

This discovery increases the number of known dinosaur species in Thailand to 14 and provides important information about life in Southeast Asia during the Early Cretaceous.

Learning

🚀 The Jump from 'Simple' to 'Sophisticated'

At the A2 level, you likely say: "The dinosaur was big because it was hot." To reach B2, you need to describe cause and effect using more precise connections. Look at this sentence from the text:

"...the massive size of these dinosaurs might have been caused by the high global temperatures..."

💡 The Magic of "Caused By"

Instead of just using "because," B2 speakers use Passive Causality. This shifts the focus from the person/thing doing the action to the result.

Compare the levels:

A2 (Basic): High temperatures made the dinosaurs big.
B2 (Advanced): The massive size was caused by high temperatures.

🛠️ How to use it in your life

Stop using "because" for everything. Try this formula: [The Result] + [was/were] + [caused by] + [The Reason]

A2: I am tired because I worked too much.
B2: My exhaustion was caused by a heavy workload.

🔍 Vocabulary Expansion: The 'Precision' Shift

B2 students replace generic words (like big or area) with context-specific terms.

A2 Word	B2 Alternative from Text	Why it's better
Big	Massive	Shows extreme scale
Area	Ecosystem	Describes a biological community
Many	Various	Suggests different types, not just a high number

⚠️ Pro Tip: The "Likely" Modifier

Notice the phrase "which likely protected it." At A2, we say "maybe." At B2, we use adverbs of probability like likely or probably to make our arguments sound more academic and less like a guess.

Vocabulary Learning

identified (v.)

to recognize or name something as a particular person or thing

Example:The researchers identified the fossil as a new species of dinosaur.

collaboration (n.)

the act of working together with others to achieve a common goal

Example:The study was the result of a collaboration between several universities.

skeletal (adj.)

relating to or made of a skeleton

Example:The scientists examined the skeletal remains of the dinosaur.

remains (n.)

the parts of a body or object that are left after the rest has been destroyed or removed

Example:The archaeologists found bone remains in the excavation site.

determined (v.)

to decide firmly or to find out by investigation

Example:They determined the dinosaur's weight from the measurements.

tonnes (n.)

a unit of weight equal to 1,000 kilograms

Example:The dinosaur weighed between 25 and 28 tonnes.

published (v.)

to make information available to the public, especially in a book or journal

Example:The findings were published in Scientific Reports.

ecosystem (n.)

a community of living organisms and their physical environment, interacting as a system

Example:The river ecosystem supported many different species.

predators (n.)

animals that hunt and eat other animals

Example:Large predators roamed the area during the Early Cretaceous.

protected (v.)

to keep safe from harm or danger

Example:Its great size protected it from being hunted by predators.

reduce (v.)

to make something smaller or less in amount

Example:Air sacs in the bones help reduce the dinosaur's weight.

impossible (adj.)

not able to be done or achieved

Example:It became impossible for the dinosaurs to survive in the shallow sea.

massive (adj.)

very large and heavy

Example:The massive size of the dinosaur was remarkable.

global (adj.)

relating to the whole world

Example:Global temperatures were higher during the Early Cretaceous.

discovery (n.)

the act of finding something new or unknown

Example:The discovery of Nagatitan added to the knowledge of dinosaur species.