Amphisaurus Facts
Pronunciation: AM-fee-SORE-us
Name meaning: Double Lizard
| Diet | Herbivore |
| Height | 1m |
| Length | 2.4m |
| Weight | 27 kg |
| Environment | Land |
| Era | Jurassic |
| Period | Early Jurassic |
| Type | Sauropod |
| Location | Northeastern United States |
Amphisaurus was a small basal sauropod that lived during the Early Jurassic period, between 201.4 and 192 million years ago. Originally discovered in the red sandstone formations of the Connecticut Valley in northeastern United States, this dinosaur represents one of the earliest examples of the group that would eventually evolve into the massive long-necked giants we know today.
As a primitive sauropod, Amphisaurus was much smaller than its later relatives, measuring approximately 2.4 metres in length and standing about 1 metre tall at the hips. It possessed the characteristic long neck and tail of sauropods, though these features were less pronounced than in later species. Its body was built for a plant-eating lifestyle, with a small head equipped with simple, peg-like teeth suitable for stripping vegetation.
This early sauropod lived in a world very different from that of its giant descendants. The Early Jurassic landscape was dominated by ferns, conifers, and cycads, providing ample vegetation for herbivorous dinosaurs. Amphisaurus likely fed on low-growing plants and could possibly rear up on its hind legs to reach higher vegetation, a behaviour that would become more common in later sauropods.
The discovery and naming of Amphisaurus has a complex history, having gone through several name changes due to taxonomic complications. This reflects the challenges early palaeontologists faced when establishing the classification system we use today for prehistoric life.
What made Amphisaurus distinctive?
Amphisaurus had a relatively small, lightweight build compared to later sauropods, with a moderately long neck and tail. Its limbs were slender and its head was small in proportion to its body, equipped with simple, leaf-shaped teeth for processing plant material.
Behaviour
Amphisaurus likely lived in small herds and spent much of its time foraging for vegetation near ground level. It may have been capable of both quadrupedal and occasional bipedal locomotion, allowing it to reach different food sources at various heights.
Discovery
Amphisaurus was first described by Edward Hitchcock in 1818. The original fossils were discovered at Upper Portland Formation, Connecticut Valley, USA.
Amphisaurus FAQ
What did Amphisaurus eat?
Amphisaurus was a herbivore that fed on
Early Jurassic plants including ferns, conifers, and cycads. Its simple, peg-like teeth were designed for stripping and processing plant material rather than chewing.
How big was Amphisaurus?
Amphisaurus was quite small for a sauropod, measuring about 2.4 metres long and standing 1 metre tall at the hips. It weighed approximately 27 kilograms, making it much lighter than its later relatives.
When did Amphisaurus live?
Amphisaurus lived during the
Early Jurassic period, approximately 201.4 to 192 million years ago. This was a time when dinosaurs were becoming more diverse and the supercontinent Pangaea was beginning to split apart.
Where was Amphisaurus found?
Amphisaurus fossils were discovered in the northeastern United States, specifically in the red sandstone of the Upper Portland Formation in the Connecticut Valley. This area was rich in
Early Jurassic fossils.
How do you pronounce Amphisaurus?
Amphisaurus is pronounced 'AM-fee-SORE-us', with emphasis on the first and third syllables. The name comes from Greek words meaning 'double lizard'.
What does Amphisaurus mean?
Amphisaurus means 'double lizard' in Greek. The name comes from 'amphi' meaning 'double' or 'both sides' and 'saurus' meaning 'lizard', though like all dinosaurs, it was actually a reptile rather than a lizard.
How fast could Amphisaurus run?
The exact speed of Amphisaurus is unknown, but as a small, relatively lightweight sauropod, it was likely more agile than its massive later relatives. Its build suggests it could move at a reasonable pace when needed.
What type of dinosaur was Amphisaurus?
Amphisaurus was a basal sauropod dinosaur, representing an early stage in the evolution of the long-necked giants. It belonged to the saurischian dinosaurs and was much smaller than later sauropods like
Brontosaurus.
Was Amphisaurus related to birds?
While all dinosaurs share a common ancestor with birds, Amphisaurus was a sauropod and therefore more distantly related to birds than theropod dinosaurs. Birds evolved from theropods, not from the sauropod lineage that Amphisaurus belonged to.
How many Amphisaurus fossils have been found?
Only a limited number of Amphisaurus fossils have been discovered, primarily from the Connecticut Valley. The fossil record for this early sauropod is relatively sparse, which is typical for many
Early Jurassic dinosaurs.
