Siamodon

Say it: see-AM-oh-don

Name means: “Siam tooth”1

Ate: PlantsBeaked plant-eatersEarly Cretaceous

Siamodon was a plant-eating dinosaur that lived in what is now Thailand. It had a beak and strong cheek teeth to chew tough plants. This dinosaur was about the size of a cow.2 1

Lived

121 to 113 million years ago4

Early Cretaceous

Fossils found in

Ban Saphan Hin, Nakhon Ratchasima Province, northeastern Thailand4

Food

Plants2

When did it live?

Triassic

Jurassic

Cretaceous

252 million years ago20114566, the asteroid

cool stuff

Fun facts

Siamodon is known from a nearly complete left upper jaw bone called a maxilla, which held several teeth.4

Scientists also found an isolated tooth and a braincase that they think belong to Siamodon.1

Siamodon lived during the Aptian age of the Early Cretaceous, about 125 to 113 million years ago.2

Siamodon was an advanced iguanodontian, a group of plant-eating dinosaurs that are close relatives of the duck-billed hadrosaurs.1

The fossils of Siamodon were found in the Khok Kruat Formation, a rock layer that was once a river floodplain.4 1

Siamodon was a ground-dwelling dinosaur that walked on four legs but could probably rear up on two legs to reach higher plants.2

AI-made picture of Siamodon — An AI-made picture of how Siamodon 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 Siamodon

?What did Siamodon eat?

Siamodon was a plant-eater. It had a beak and strong cheek teeth to chew tough plants.3

?How big was Siamodon?

Siamodon was about the size of a cow. Its upper jaw bone was 230 millimeters long.3

?When did Siamodon live?

Siamodon lived during the Aptian age of the Early Cretaceous, about 125 to 113 million years ago.3

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For dino experts

Scientific name: Siamodon
Named by: Buffetaut and Suteethorn 20114
Group: Beaked plant-eaters
Family / clade: Hadrosauriformes4
Classification: Ornithischia > Ornithopoda > Iguanodontia4
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: Siamodon was named by French paleontologist Eric Buffetaut and Thai paleontologist Varavudh Suteethorn in 2011. They described it from a well-preserved upper jaw found in northeastern Thailand.4 1
Still debated: Scientists are not sure exactly how big Siamodon was, because only a few bones have been found so far.2

Where the facts come from

A new iguanodontian dinosaur from the Khok Kruat Formation (Early Cretaceous, Aptian) of northeastern Thailand - EM consulte (em-consulte.com)
PBDB Taxon (paleobiodb.org)
Siamodon (en.wikipedia.org)
Siamodon 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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