About
Omeisaurus tianfuensis was an impressive dinosaur that roamed the lush floodplains of what is now Sichuan Province, China, during the Middle Jurassic period. This herbivorous giant possessed one of the most striking features among sauropods: an extraordinarily long neck supported by 17 cervical , accounting for nearly half of its total body length. The neck was held in a relatively horizontal position, allowing Omeisaurus to sweep across vast feeding areas without moving its massive body.
The body plan was typical of mamenchisaurid sauropods, with a relatively small head, barrel-shaped torso supported by four pillar-like legs, and a long whip-like tail that may have served defensive purposes. The forelimbs were slightly shorter than the hindlimbs, giving the back a gentle slope toward the shoulders. Its teeth were spatulate and suited for stripping vegetation from trees and ferns.
Discovered at the famous Dashanpu Quarry near Zigong in 1984, Omeisaurus tianfuensis represents one of the most complete sauropod skeletons ever found in Asia. The Dashanpu site has yielded an exceptional Middle Jurassic ecosystem snapshot, and Omeisaurus likely shared its habitat with other sauropods, early stegosaurs, and various predators. The species name honors Tianfu, an ancient name for Sichuan Province, while Omeisaurus references nearby Mount Emei, a sacred Buddhist mountain. This dinosaur has become an iconic symbol of Chinese paleontology and a centerpiece of the Zigong Dinosaur Museum.
Explore the anatomy
5 featuresWith 17 neck bones stretching half its entire body length, this was one of the most extreme necks of any dinosaur ever. Each bone was filled with air pockets connected to the lungs, making the neck surprisingly lightweight despite its incredible length β like having a built-in helium balloon system!
The small skull held broad, spoon-shaped teeth perfect for raking leaves off ferns and cycads. Unlike the pencil-thin teeth of some later long-necked giants, these chompers were built for stripping whole branches rather than delicate nibbling β more salad rake than chopsticks.
The spines on top of each neck bone split into a Y-shape, forming a groove that held a thick stretchy ligament running the entire neck. This built-in bungee cord meant the neck could stay lifted with way less muscle effort β like nature's energy-saving suspension system!
The front legs were noticeably shorter than the back legs, giving the body a downward slope toward the head. This shifted weight toward the hips and may have helped the animal briefly rear up on two legs to snag leaves from taller trees.
The tail ended in a series of tiny, stretched-out bones that tapered to a thin whip-like tip. Similar tails evolved separately in dinosaurs on other continents, hinting this design was useful β possibly for cracking like a whip to scare off predators or communicate with the herd.
Where Omei Lizard Roamed
During the Middle Jurassic, approximately 165 million years ago, this region of what is now Sichuan Province lay within the warm, humid interior of the vast Asian landmass, part of the ancient supercontinent Laurasia. The Sichuan Basin formed a lush, low-lying floodplain surrounded by emerging highlands, where meandering rivers and seasonal lakes supported dense forests of conifers, ferns, and cycadsβan ideal habitat for massive sauropods like *Omeisaurus tianfuensis*.
Keep exploring the vault
Yangchuanosaurus
Yangchuanosaurus shangyouensis
Yangchuanosaurus was the apex predator of the Middle-Late Jurassic Sichuan Basin ecosystem in China, reaching 8-10m in length.
Shu Lizard
Shunosaurus lii
Shunosaurus and Omeisaurus are both Middle Jurassic sauropods from the Dashanpu Formation of Sichuan, China.
Barapasaurus
Barapasaurus from the Early Jurassic of India represents one of the earliest known eusauropods.
Mamenchisaurus
Mamenchisaurus sinocanadorum
Both Mamenchisaurus and Omeisaurus are mamenchisaurid sauropods that independently developed extremely elongated necks (comprising nearly half their body length) during the Middle-Late Jurassic of China, representing a parallel evolutionary experiment in vertical browsing adaptation distinct from other sauropod lineages.
Huayangosaurus
Huayangosaurus taibaii
Huayangosaurus, an early stegosaur, is known from the same Dashanpu Formation deposits as Omeisaurus.
Whale Lizard
Cetiosaurus oxoniensis
Cetiosaurus (Middle Jurassic, England) and Omeisaurus (Middle Jurassic, China) represent parallel development of large-bodied, long-necked sauropods on separate continents during the same time period, showing convergent gigantism in sauropodomorph evolution across Laurasia.