Kritosaurus Facts
Pronunciation: KRITE-oh-SORE-us
Name meaning: Separated Lizard
| Diet | Herbivore |
| Height | 3m |
| Length | 9m |
| Weight | 3 tonnes |
| Environment | Land |
| Era | Cretaceous |
| Period | Late Cretaceous |
| Type | Ornithopod |
| Location | North America |
Kritosaurus was a large ornithopod dinosaur that lived during the Late Cretaceous period, approximately 74.5 to 66 million years ago. This duck-billed dinosaur roamed the coastal plains and river deltas of what is now the southwestern United States, particularly New Mexico. Despite being one of the earlier hadrosaur discoveries, Kritosaurus remains poorly understood due to the fragmentary nature of its fossils.
Like other ornithopods of its time, Kritosaurus was a substantial herbivore, estimated to reach about 9 metres in length and standing roughly 3 metres tall at the hip. Its most distinctive feature was a prominent nasal crest that gave it what palaeontologists often describe as a 'Roman nose' appearance. This bony ridge along the snout may have been used for display purposes or to produce sounds for communication with other members of its species.
As a herbivore, Kritosaurus would have fed on the abundant plant life of the Late Cretaceous, including ferns, conifers, and flowering plants. Its duck-like bill was perfectly adapted for cropping vegetation, whilst rows of grinding teeth in its cheeks processed tough plant material. The dinosaur could move both on two legs when speed was needed and on all fours when feeding closer to the ground.
However, the validity of Kritosaurus as a distinct genus remains contentious amongst palaeontologists. Many specimens originally attributed to this dinosaur have since been reassigned to other hadrosaur genera, leaving Kritosaurus based on rather incomplete remains that make definitive classification challenging.
What made Kritosaurus distinctive?
Kritosaurus is characterised by its prominent nasal crest that created a distinctive 'Roman nose' profile along its snout. This bony ridge was more pronounced than in many other hadrosaurs, giving the skull a unique arched appearance when viewed from the side.
Behaviour
Kritosaurus likely lived in herds, as evidenced by multiple fossil discoveries in similar geological formations. The prominent nasal crest probably served as a visual display structure and may have been used to produce distinctive calls for communication within the herd, particularly during mating seasons or when warning of predators.
Discovery
Kritosaurus was first described by Barnum Brown in 1910. The original fossils were discovered at Kirtland Formation, New Mexico, USA.
Kritosaurus FAQ
What did Kritosaurus eat?
Kritosaurus was a herbivore that fed on the diverse plant life of the
Late Cretaceous period. It used its duck-like bill to crop ferns, conifers, flowering plants, and other vegetation, then processed this tough plant material with rows of grinding teeth in its cheeks.
How big was Kritosaurus?
Kritosaurus was a large dinosaur, reaching approximately 9 metres in length and standing about 3 metres tall at the hip. It weighed an estimated 3 tonnes, making it comparable in size to other large hadrosaurs of its time.
When did Kritosaurus live?
Kritosaurus lived during the
Late Cretaceous period, approximately 74.5 to 66 million years ago. This was near the very end of the age of dinosaurs, shortly before the mass extinction event that ended the Mesozoic Era.
Where was Kritosaurus found?
Kritosaurus fossils have been discovered in North America, particularly in the Kirtland Formation of New Mexico, USA. The original specimen was found by famous fossil hunter Barnum Brown in 1910.
How do you pronounce Kritosaurus?
Kritosaurus is pronounced 'KRITE-oh-SORE-us', with emphasis on the first syllable. The name comes from Greek words meaning 'separated lizard'.
What does Kritosaurus mean?
Kritosaurus means 'separated lizard' in Greek. However, the name is often mistranslated as 'noble lizard' in reference to the dinosaur's distinctive Roman nose-like nasal crest.
How fast could Kritosaurus run?
The exact speed of Kritosaurus is unknown due to limited fossil evidence. However, as a large ornithopod, it was likely capable of reaching moderate speeds when fleeing from predators, probably similar to other hadrosaurs of comparable size.
What type of dinosaur was Kritosaurus?
Kritosaurus was an ornithopod dinosaur, specifically a member of the hadrosaur (duck-billed dinosaur) family. However, its classification is uncertain due to fragmentary fossil remains, and it's considered a nomen dubium by many palaeontologists.
Was Kritosaurus related to birds?
As an ornithopod dinosaur, Kritosaurus was not closely related to modern birds. Birds evolved from theropod dinosaurs, whilst Kritosaurus belonged to the ornithischian lineage. However, like all dinosaurs, it shares a common ancestor with birds.
How many Kritosaurus fossils have been found?
Very few definitive Kritosaurus fossils have been found, which is why the genus is considered problematic by many scientists. The original specimen consists mainly of skull fragments, and many fossils once attributed to Kritosaurus have since been reassigned to other hadrosaur genera.
