Ammosaurus Facts
Pronunciation: AM-oh-SORE-us
Name meaning: Sand Lizard
| Diet | Herbivore |
| Height | 1.2m |
| Length | 4m |
| Weight | 500 kg |
| Environment | Land |
| Era | Jurassic |
| Period | Early Jurassic |
| Type | Sauropod |
| Location | North America |
Ammosaurus, meaning 'sand lizard', was an early sauropod dinosaur that lived during the Early Jurassic period, approximately 201 million years ago. Originally described as a separate genus, palaeontologists now consider Ammosaurus to be the same animal as Anchisaurus, making it what scientists call a 'junior synonym'. This fascinating creature represents one of the earliest members of the sauropod lineage that would eventually give rise to the largest land animals that ever lived.
Living in what is now the northeastern United States, Ammosaurus inhabited a landscape of river plains and forests during the early Jurassic. At around 4 metres long and standing about 1.2 metres tall at the hip, it was considerably smaller than its later sauropod relatives like Brontosaurus. Weighing approximately half a tonne, this early sauropod had a relatively long neck and tail, though not as extremely elongated as later species.
As a herbivore, Ammosaurus fed on the abundant plant life of its time, including ferns, conifers, and cycads. Its teeth were leaf-shaped and suitable for cropping vegetation, though it likely swallowed stones to help grind up tough plant material in its stomach. The creature could probably rear up on its hind legs to reach higher vegetation, a behaviour that would become characteristic of many later sauropods.
The fossils of Ammosaurus were discovered in the red sandstones of the Portland Formation in Connecticut, providing valuable insights into the early evolution of the sauropod group during a crucial period in dinosaur history.
What made Ammosaurus distinctive?
Ammosaurus had a moderately long neck and tail compared to its body size, with relatively robust limbs. Its head was small in proportion to its body, and it possessed leaf-shaped teeth adapted for processing plant material.
Behaviour
Ammosaurus likely lived in small herds and could rear up on its hind legs to browse on higher vegetation. It probably used gastroliths (stomach stones) to help digest tough plant material, a behaviour common among early sauropods.
Discovery
Ammosaurus was first described by Othniel Charles Marsh in 1889. The original fossils were discovered at Portland Formation, Connecticut, USA.
Ammosaurus FAQ
What did Ammosaurus eat?
Ammosaurus was a herbivore that fed on the plants available during the
Early Jurassic period, including ferns, conifers, cycads, and other primitive plants. It used its leaf-shaped teeth to crop vegetation and likely swallowed stones to help grind up tough plant material in its stomach.
How big was Ammosaurus?
Ammosaurus was about 4 metres long and stood approximately 1.2 metres tall at the hip. It weighed around 500 kilograms, making it much smaller than the giant sauropods that would evolve later in the Jurassic and Cretaceous periods.
When did Ammosaurus live?
Ammosaurus lived during the
Early Jurassic period, approximately 201.4 million years ago. This was a time when dinosaurs were diversifying rapidly and the supercontinent Pangaea was beginning to break apart.
Where was Ammosaurus found?
Ammosaurus fossils were discovered in North America, specifically in the red sandstones of the Portland Formation in Connecticut, USA. These rocks were formed in river environments during the
Early Jurassic period.
How do you pronounce Ammosaurus?
Ammosaurus is pronounced 'AM-oh-SORE-us'. The first part 'Ammo' sounds like ammunition, followed by 'saurus' which rhymes with 'chorus'.
What does Ammosaurus mean?
Ammosaurus means 'sand lizard' in Greek. The name comes from 'ammos' meaning sand and 'saurus' meaning lizard, referring to the sandy rock formations where it was discovered.
How fast could Ammosaurus run?
The exact speed of Ammosaurus is unknown, but as a relatively small early sauropod, it was probably not built for speed. It likely moved at a steady walking pace, though it may have been capable of short bursts of faster movement when threatened.
What type of dinosaur was Ammosaurus?
Ammosaurus was an early sauropod dinosaur, belonging to the family Anchisauridae. It represents one of the earliest members of the group that would eventually evolve into the giant long-necked dinosaurs like
Brontosaurus and
Diplodocus.
Was Ammosaurus related to birds?
As a sauropod, Ammosaurus belonged to a different major group of dinosaurs than birds. Birds evolved from theropod dinosaurs, while Ammosaurus was a sauropod. However, both groups are part of the larger dinosaur family tree, so they share common dinosaur ancestors.
How many Ammosaurus fossils have been found?
Relatively few Ammosaurus fossils have been discovered, and the genus is now considered to be the same as Anchisaurus. The original specimens were found in Connecticut quarries, but complete skeletons are rare, making this early sauropod somewhat poorly known compared to later species.
