Nagatitan chaiyaphumensis Identified as the Largest Dinosaur in Southeast Asia

May 14, 2026, 20:17
AsiaScience

Introduction

Researchers have discovered a new species of sauropod dinosaur, named Nagatitan chaiyaphumensis, based on skeletal remains found in Thailand's Chaiyaphum province.

Main Body

The dinosaur lived during the Early Cretaceous period about 113 million years ago. It reached nearly 90 feet in length and weighed between 25 and 28 tons. Scientists emphasized that its bone structure, including a 5.8-foot upper arm bone, featured internal air sacs to reduce its overall weight. The excavation began after a local resident found the remains in 2016, although work only resumed in 2024 after a break in funding. Evidence suggests that this species lived in a subtropical environment consisting of forests and savannas. It likely ate large amounts of plants, such as conifers and ferns. Because of its massive size, adult Nagatitan dinosaurs faced very little danger from predators. The largest predator in the area weighed only 3.5 tons, meaning it could only hunt young, sick, or old individuals. Consequently, these dinosaurs likely grew very quickly after birth to avoid being eaten. From a geographical perspective, Nagatitan is the 14th named dinosaur in Thailand. Researchers described it as the region's 'final titan' because the land later became a shallow sea, making it impossible for other large sauropods to live there. Furthermore, experts asserted that the rise in global temperatures and carbon dioxide levels may have caused these herbivores to evolve such extreme body sizes, paving the way for even larger dinosaurs found later in China and South America.

Conclusion

The discovery of Nagatitan chaiyaphumensis provides important information about dinosaur diversity and how ancient climates influenced the growth of giant dinosaurs in Southeast Asia.

Learning

⚡ The 'Cause-and-Effect' Logic Leap

To move from A2 to B2, you must stop using only 'because' and start using Logical Connectors. A2 students describe what happened; B2 students explain why it happened using complex links.

🛠️ The Upgrade Path

Look at how the article connects ideas. Instead of saying "The dinosaur was big, so it was safe," the text uses high-level transitions:

  • "Consequently..." →\rightarrow Use this to introduce a direct result.
    • Example: "The predators were small. Consequently, the adult Nagatitan was safe."
  • "Paving the way for..." →\rightarrow Use this when one event makes the next event possible.
    • Example: "The climate changed, paving the way for even larger dinosaurs."

🔍 Linguistic Breakdown: The 'Passive' Observation

B2 English often uses the passive voice to sound more objective and academic.

*"Nagatitan chaiyaphumensis [was] Identified as..." *"...remains [were] found in Thailand..."

A2 Style: "Researchers found remains in Thailand." (Simple/Active) B2 Style: "Remains were found in Thailand." (Formal/Passive)

Why this matters: In B2 exams and professional writing, the action (finding the bone) is more important than the person (the researcher).

🚀 Vocabulary Power-Ups

Stop using "very big" or "very small." Steal these precise B2 adjectives from the text:

A2 WordB2 UpgradeContext from Text
HugeMassive"...because of its massive size..."
GiantExtreme"...evolve such extreme body sizes..."
ManyDiversity"...information about dinosaur diversity..."

Vocabulary Learning

discovered (v.)
found or learned about something for the first time
Example:Scientists discovered a new species of dinosaur in Thailand.
species (n.)
a group of organisms that can breed together and produce fertile offspring
Example:The new species was named Nagatitan chaiyaphumensis.
sauropod (n.)
a type of large, long‑necked dinosaur
Example:Sauropods were among the biggest land animals that ever lived.
dinosaur (n.)
a prehistoric reptile that lived millions of years ago
Example:The dinosaur weighed about 28 tons.
skeletal (adj.)
relating to bones
Example:The skeletal remains were studied by paleontologists.
remains (n.)
the parts of a dead organism that are left over
Example:The remains were found in a shallow sea.
province (n.)
a region or administrative area within a country
Example:The remains were found in Chaiyaphum province.
period (n.)
a length or portion of time
Example:It lived during the Early Cretaceous period.
length (n.)
the measurement from one end to the other
Example:It was nearly 90 feet in length.
bone (n.)
a hard connective tissue that forms the skeleton
Example:The upper arm bone measured 5.8 feet.
structure (n.)
the arrangement of parts in a whole
Example:Its bone structure included internal air sacs.
reduce (v.)
to make something smaller or less
Example:The air sacs helped reduce its overall weight.
excavation (n.)
the process of digging out something from the ground
Example:The excavation began after the remains were found.
resident (n.)
a person who lives in a particular place
Example:A local resident discovered the fossils.
funding (n.)
money provided for a project or activity
Example:The work resumed after funding was restored.
subtropical (adj.)
relating to a climate just below the tropics, warm but not tropical
Example:The dinosaur lived in a subtropical environment.
environment (n.)
the surroundings or conditions in which something exists
Example:It lived in forests and savannas.
predators (n.)
animals that hunt and eat other animals
Example:Predators were scarce due to the dinosaur's size.
individuals (n.)
single members of a group
Example:The predators could only hunt young individuals.
evolve (v.)
to develop gradually over time
Example:Herbivores evolved extreme body sizes.
global (adj.)
relating to the whole world
Example:Global temperatures were rising.
temperatures (n.)
the degree of heat or cold
Example:Higher temperatures affected dinosaur growth.
carbon (n.)
a chemical element found in many compounds
Example:Carbon dioxide levels increased.
dioxide (n.)
a compound of oxygen and another element
Example:Carbon dioxide is a greenhouse gas.
herbivores (n.)
animals that eat plants
Example:Herbivores like Nagatitan were large.