Huayangosaurus is a very important member of the same family to which Stegosaurus belongs. It is the oldest known member of the stegosaur family and it seems to demonstrate how these dinosaurs evolved the plates along their backs. Huayangosaurus was less than half the size of its later family members.
This dinosaur is considered one of the most important fossils to be discovered in China. It is one of only two stegosaurs to be found with an associated skull. Huayangosaurus exhibits many characteristics of an evolutionarily transitional species. The plates along its back become more spike-like the closer they are to the tail. This supports the theory that stegosaur plates evolved from spikes. The skull and teeth are also more primitive than later stegosaurs, as this species still had premaxillary teeth, which disappeared in later stegosaurs.
Huayangosaurus appears in the game Jurassic World: Evolution. Its body is a light brown colour with darker brown across its back. This is the first time it has appeared in any Jurassic Park media.