Limusaurus Facts
Pronunciation: LIE-moo-SORE-us
Name meaning: Mud Lizard
| Diet | Omnivore |
| Height | 0.6m |
| Length | 1.7m |
| Weight | 15 kg |
| Environment | Land |
| Era | Jurassic |
| Period | Late Jurassic |
| Type | Theropod |
| Location | China |
Limusaurus was a remarkable small theropod dinosaur that lived in what is now China during the Late Jurassic period, approximately 161 to 157 million years ago. This slender dinosaur measured about 1.7 metres in length and weighed around 15 kilograms, making it roughly the size of a large dog. Its name, meaning 'mud lizard', reflects the circumstances of its discovery—fossils were found preserved in mudstone, suggesting these animals may have become trapped in sticky mud.
What makes Limusaurus truly extraordinary is its dramatic transformation as it aged. Juvenile Limusaurus had small, sharp teeth suitable for catching insects and small prey, but as they matured, these teeth were completely lost and replaced by a toothless beak. This remarkable change suggests that young Limusaurus were carnivorous whilst adults became herbivorous or omnivorous, feeding on plants and possibly some small animals.
Limusaurus had an unusually long neck and legs, which would have made it an agile runner across the floodplains of ancient China. However, its forelimbs were remarkably tiny and likely of little use. These features made it surprisingly similar to the much later ornithomimid theropods, demonstrating convergent evolution—where unrelated animals develop similar characteristics independently.
The discovery of multiple Limusaurus specimens has provided palaeontologists with unprecedented insight into how some theropod dinosaurs changed throughout their lives, challenging our understanding of dinosaur feeding strategies and evolution.
What made Limusaurus distinctive?
Limusaurus was distinguished by its extremely long neck and legs, tiny useless forelimbs, and most remarkably, the complete loss of teeth with age as juveniles developed into toothless, beaked adults. Its slender build and proportions were quite unlike most other theropod dinosaurs.
Behaviour
Limusaurus likely lived in small groups near ancient river systems and floodplains where several individuals became trapped in mud. Young Limusaurus probably hunted insects and small prey, whilst adults used their beaks to strip vegetation and possibly crack seeds or nuts.
Discovery
Limusaurus was first described by Xu Xing and colleagues in 2009. The original fossils were discovered at Upper Shishugou Formation, Junggar Basin, China.
Limusaurus FAQ
What did Limusaurus eat?
Limusaurus had a changing diet throughout its life. Juveniles were carnivorous, using their small sharp teeth to catch insects and small prey. As adults, they lost all their teeth and developed beaks, becoming herbivorous or omnivorous and feeding on plants, seeds, and possibly some small animals.
How big was Limusaurus?
Limusaurus was a small dinosaur, measuring about 1.7 metres long and standing roughly 0.6 metres tall at the hip. It weighed approximately 15 kilograms, making it about the size of a large dog like a Border Collie.
When did Limusaurus live?
Limusaurus lived during the
Late Jurassic period, approximately 161 to 157 million years ago. This was a time when many famous dinosaurs like
Stegosaurus and
Allosaurus also roamed the Earth.
Where was Limusaurus found?
Limusaurus fossils were discovered in China, specifically in the Upper Shishugou Formation in the Junggar Basin. Multiple specimens were found preserved in ancient mudstone deposits.
How do you pronounce Limusaurus?
Limusaurus is pronounced 'LIE-moo-SORE-us', with the emphasis on the first syllable. The name comes from Latin words meaning 'mud lizard'.
What does Limusaurus mean?
Limusaurus means 'mud lizard' in Latin. The name refers to how the fossils were found preserved in mudstone, suggesting these dinosaurs became trapped in ancient mud. The species name 'inextricabilis' means 'impossible to extricate'.
How fast could Limusaurus run?
The exact running speed of Limusaurus is unknown, but its long, slender legs suggest it was built for speed and agility. It was likely a quick runner, able to escape predators across the floodplains where it lived.
What type of dinosaur was Limusaurus?
Limusaurus was a theropod dinosaur, belonging to the family Noasauridae. Despite being in the same group as fearsome predators like
Tyrannosaurus, Limusaurus was small and evolved to eat plants as an adult.
Was Limusaurus related to birds?
Yes, as a theropod dinosaur, Limusaurus was part of the group that eventually gave rise to birds. However, it was not a direct ancestor to modern birds but rather a side branch that developed its own unique characteristics.
How many Limusaurus fossils have been found?
Multiple Limusaurus specimens have been discovered, including both juvenile and adult individuals. This has allowed scientists to study how the dinosaur changed as it aged, particularly the remarkable loss of teeth in adults.
