Key Information
Huayangosaurus
| Species | Huayangosaurus taibaii |
| Diet | Herbivore |
| Length | 13 ft |
| Height | 4 to 5 ft |
| Weight | 1,100 lb |
| Timescale | Middle Jurassic |
| Classification | Ornithischia > Thyreophora > Stegosauria > Huayangosauridae |
| Similar Species | Stegosaurus, Kentrosaurus |
Learning Point
- The Huayangosaurus was a spike-tailed trailblazer of the Middle Jurassic, living about 165 million years ago in what is now China. As one of the earliest known stegosaurs, it was smaller and more primitive than its famous cousin, Stegosaurus. It featured a double row of leaf-shaped plates along its back and lethal “thagomizer” spikes on its tail for defense. Uniquely, its skull was broader and still held teeth in the front of its mouth—a feature later stegosaurs did not have. Think of it as the “prototype” model for the armored, plate-backed dinosaurs we know today.
Project
- Draw Huayangosaurus in its natural environment.
- Overview
- X-Ray
Location
| Confirmed | China |
Fun Facts
- The name, Huayangosaurus means “Huayang lizard” in Greek, where Huayang is another name for Sichuan where it was found.
- Huayangosaurus is one of the oldest relatives of the famous Stegosaurus. It lived about 165 million years ago, which is 20 million years before its more famous cousin was even born!
- Unlike later stegosaurs that only had beaks, Huayangosaurus still had teeth in the front of its mouth. This makes it look a bit more like a “toothy” lizard compared to the toothless-fronted dinosaurs that came later.
- This dinosaur didn’t just have plates on its back; it had big, scary spikes sticking out from its shoulders. These likely acted like a protective fence to keep predators from taking a bite out of its neck.
Past Lessons
| 219 | January 19, 2026 | (North America) |