Elosaurus Facts
Pronunciation: EE-low-SORE-us
Name meaning: Marsh Lizard
| Diet | Herbivore |
| Height | 4m |
| Length | 21m |
| Weight | 16 tonnes |
| Speed | 15 km/h |
| Environment | Land |
| Era | Jurassic |
| Period | Late Jurassic |
| Type | Sauropod |
| Location | United States |
Although originally named as a distinct genus in 1902, Elosaurus is now recognised as a junior synonym of Apatosaurus ajax, making it part of one of the most famous sauropod lineages. This massive herbivorous dinosaur roamed the ancient floodplains of western North America during the Late Jurassic period, approximately 155 to 149 million years ago, when the climate was much warmer and more humid than today.
As a sauropod, this enormous creature possessed the classic long-necked body plan that made these dinosaurs so successful. It measured around 21 metres in length and stood approximately 4 metres tall at the hips, with its neck allowing it to reach heights of over 8 metres when fully extended. Weighing an estimated 16 tonnes, it was supported by four massive, column-like legs that distributed its incredible weight across the soft ground of its prehistoric habitat.
Like other members of its group, this sauropod was a dedicated herbivore that spent most of its time feeding on the abundant plant life of the Morrison Formation. Its long neck enabled it to browse on tall conifers, cycads, and ferns without moving its massive body, making feeding highly efficient. The dinosaur's peg-like teeth were perfectly adapted for stripping leaves and soft shoots, which it would swallow whole to be processed in its enormous gut.
The original Elosaurus fossils, though fragmentary, contributed valuable information to our understanding of Late Jurassic sauropod diversity and evolution, even though they are now recognised as belonging to the well-known Apatosaurus lineage.
What made Elosaurus distinctive?
As part of the Apatosaurus lineage, this sauropod had a relatively robust build compared to other long-necked dinosaurs, with a thick, muscular neck and a long, whip-like tail. Its head was small in proportion to its massive body, and it possessed the characteristic peg-like teeth typical of diplodocid sauropods.
Behaviour
This sauropod likely lived in small herds, moving slowly through the ancient forests and floodplains in search of suitable vegetation. Its long neck allowed it to feed at different heights without competition, and it may have used its powerful tail as a defensive weapon against predators like Allosaurus.
Discovery
Elosaurus was first described by Othniel Charles Marsh in 1902. The original fossils were discovered at Morrison Formation, Colorado, USA.
Elosaurus FAQ
What did Elosaurus eat?
Elosaurus was a herbivore that fed on the abundant plant life of the
Late Jurassic period, including conifers, ferns, cycads, and other primitive plants. Its long neck allowed it to reach high vegetation that other dinosaurs couldn't access, whilst its peg-like teeth were perfect for stripping leaves and soft shoots.
How big was Elosaurus?
Elosaurus measured approximately 21 metres in length and stood about 4 metres tall at the hips, with an estimated weight of 16 tonnes. When it raised its head fully, it could reach heights of over 8 metres, making it one of the largest land animals of its time.
When did Elosaurus live?
Elosaurus lived during the
Late Jurassic period, approximately 155 to 149 million years ago. This was a time when the climate was much warmer and more humid than today, with lush forests covering much of western North America.
Where was Elosaurus found?
Elosaurus fossils were discovered in the Morrison Formation of Colorado, United States. This famous rock formation has yielded numerous sauropod specimens and represents one of the richest dinosaur fossil sites in North America.
How do you pronounce Elosaurus?
Elosaurus is pronounced 'EE-low-SORE-us', with the emphasis on the first syllable. The name breaks down into three parts: 'E-lo-saurus'.
What does Elosaurus mean?
Elosaurus means 'Marsh Lizard', named in honour of the famous American palaeontologist Othniel Charles Marsh, who made significant contributions to our understanding of dinosaurs during the late 19th and early 20th centuries.
How fast could Elosaurus run?
Elosaurus could probably reach speeds of around 15 km/h when necessary, though as a massive sauropod, it would have moved slowly most of the time. Its great size and weight meant that running was likely reserved for emergencies, such as escaping from large predators.
What type of dinosaur was Elosaurus?
Elosaurus was a sauropod dinosaur, specifically a member of the Diplodocidae family. However, it's now recognised as a synonym of
Apatosaurus ajax rather than a distinct genus, based on more complete fossil evidence and modern analysis techniques.
Was Elosaurus related to birds?
Like all dinosaurs, Elosaurus was distantly related to modern birds, but as a sauropod, it belonged to a very different lineage. Sauropods were part of the saurischian ('lizard-hipped') group, whilst birds evolved from theropod dinosaurs, which were also saurischians but on a completely different evolutionary branch.
How many Elosaurus fossils have been found?
The original Elosaurus was based on quite fragmentary fossil remains discovered in 1902. Since the genus is now considered synonymous with
Apatosaurus, these specimens are studied as part of the broader Apatosaurus fossil record, which includes several more complete skeletons from various sites.
