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Siamraptor

Say it: see-AM-rap-tor

Name means: “Siam robber, named after Siam, the old name for Thailand, and the Latin word for robber”1

Ate: MeatMeat-eating dinosEarly Cretaceous

Siamraptor was a meat-eating dinosaur that lived in what is now Thailand, about 121 to 113 million years ago. It was a fast and smart hunter with sharp claws and strong jaws. Scientists think it was one of the earliest big meat-eaters in its family.1 4

Lived

121 to 113 million years ago4

Early Cretaceous

Fossils found in

Fossils were found in the Khok Kruat Formation in Nakhon Ratchasima Province, Thailand.1 4

Food

Meat4

Length

7.9 to 9 m3

estimate

Weight

3.175 tonnes3

estimate

When did it live?

Triassic

Jurassic

Cretaceous

252 million years ago20114566, the asteroid

How big was it?

How long was it?

How heavy was it?

as heavy as 2 cars

as long as 2 cars parked in a rowas long as 50 bananas end to endas heavy as 110 big dogsas heavy as 640 watermelons

How big was Siamraptor compared to YOU?

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cool stuff

Fun facts

Siamraptor had a very light skeleton with lots of air spaces in its skull and backbone, which made it lighter and helped it breathe better.2

Its lower jaw had a deep oval hole and four small openings, which are special features not seen in other allosauroids.2

Siamraptor is the first named carcharodontosaurian dinosaur from Southeast Asia, which helps scientists understand how these dinosaurs spread across the world.1

The fossil bones show that Siamraptor had a huge number of air pockets and holes, a feature called skeletal pneumaticity, which is also seen in some other big meat-eaters.2

Siamraptor lived during the Aptian age, about 121 to 113 million years ago, when Thailand was part of a landmass with different animals than today.1 4

The name Siamraptor honors Suwat Liptapanlop, a supporter of fossil research in Thailand, with the species name 'suwati'.1

AI-made picture of Siamraptor — An AI-made picture of how Siamraptor might have looked, made by a computer from what scientists know. It is a guess: the real animal may have looked different, and nobody knows its true colours.

you asked

Most asked questions about Siamraptor

?How big was Siamraptor?

Siamraptor was about 7 to 8 metres (23 to 26 feet) long, roughly the size of a large bus. It was one of the earliest big meat-eaters in its family.1

?When did Siamraptor live?

Siamraptor lived during the Early Cretaceous, about 121 to 112 million years ago. That was during the Aptian age.1

?Where was Siamraptor found?

Siamraptor was found in Thailand, in the Khok Kruat Formation. The fossils were discovered near the village of Saphan Hin.1 2

?What did Siamraptor eat?

Siamraptor was a meat-eater, so it hunted other animals. It had sharp claws and strong jaws to catch and eat its prey.1

?Was Siamraptor a dinosaur?

Yes, Siamraptor was a dinosaur. It was a theropod, a group of meat-eating dinosaurs that walked on two legs.1

?Why is Siamraptor important?

Siamraptor is the first named carcharodontosaurian dinosaur from Southeast Asia. It helps scientists understand how these big meat-eaters spread across the world.1 2

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Myth buster

Myth: Some people think Siamraptor was a type of raptor like Velociraptor.

Truth: Siamraptor was not a raptor. It belonged to a group called Carcharodontosauria, which were large meat-eaters, not the small feathered raptors.1

For dino experts

Scientific name: Siamraptor
Named by: Chokchaloemwong et al. 20194
Group: Meat-eating dinos
Family / clade: Carcharodontosauria4
Classification: Theropoda > Allosauroidea4
Age of the rocks: 121 to 113 million years (Aptian)4
Rock formations: Khok Kruat4
Countries: Thailand4
Fossil records: 1 in the Paleobiology Database4
Discovery: Siamraptor was named in 2019 by a team of scientists including Duangsuda Chokchaloemwong and others, based on fossils found in Thailand between 2007 and 2009. The first fossil was a piece of the lower jaw, and more bones from at least three other individuals were found later.1
Still debated: Scientists are still debating exactly how Siamraptor is related to other carcharodontosaurs, because it has some features that are more primitive than later members of the group.2

Where the facts come from

Siamraptor (en.wikipedia.org)
A new carcharodontosaurian theropod (Dinosauria: Saurischia) from the Lower Cretaceous of Thailand | PLOS One (journals.plos.org)
Fossils of 'shark-toothed' carnivorous dinosaur dating back 115 million years found in Thailand - The Japan Times (japantimes.co.jp)
Siamraptor in The Paleobiology Database (CC BY 4.0): age, places, rock formations, classification.

Every fact on this page has a number that points to its source. If we got something wrong, sorry, we are dino fans, not a science journal. Tell us at [email protected] and we will fix it.

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