Ratchasimasaurus

Say it like this: “rat-KAS-ee-muh-SOR-us”

Ratchasimasaurus suranareae

Ratchasimasaurus ate plants and walked on two or four legs. It lived in the Early Cretaceous. Bones have been found in Thailand.

Quiz me on Ratchasimasaurus

When: Early Cretaceous (Aptian) · roughly 121.4 to 113.2 million years ago
Named in: 2011 · Shibata, M.; Jintasakul, P.; Azuma, Y.
Hip height: Not established
Length: 10 m · 33 ft
Weight: Not established
Found in: Thailand · Khok Kruat
Food and walking: Herbivore · Two or four legs
Kind: beaked plant-eater · Ornithopod
Family branch: Styracosterna

The story in short

In 2011, M. Shibata and colleagues published the name Ratchasimasaurus. The name means “nakhon Ratchasima lizard.”

Fossils referred to Ratchasimasaurus date to the Early Cretaceous (Aptian), roughly 121.4 to 113.2 million years ago. Finds come from Thailand, including the Khok Kruat Formation. It was a herbivore and could move on two or four legs.

Published estimates put Ratchasimasaurus at a length near 10 m.

On the family tree it sits in Styracosterna, among the ornithopod dinosaurs.

Close relatives

Bayannurosaurus

Bayannurosaurus perfectus

Early Cretaceous (Aptian) · roughly 121.4 to 113.2 million years ago

Calvarius

Calvarius rapidus

Late Cretaceous (Maastrichtian) · roughly 72.2 to 66 million years ago

Cedrorestes

Cedrorestes crichtoni

Early Cretaceous (Aptian) · roughly 121.4 to 113.2 million years ago