Huayangosaurus ‭(‬Huayang lizard‭ ‬-‭ ‬Huayang is an alternative name for Sichuan Province‭)

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Huayangosaurus ‭(‬Huayang lizard‭ ‬-‭ ‬Huayang is an alternative name for Sichuan Province‭)

Phonetic : Hu-ay-ang-o-sore-us.

Named By : Dong,‭ ‬Tang‭ & ‬Zhou‭ ‬-‭ ‬1982

Diet : Herbivore

Size : Estimated 4.5 meters long

Type of Dinosaur : Armoured Dinosaurd

Type Species : H.‭ ‬taibaii‭ (‬type‭)‬

Found in : China‭ ‬-‭ ‬Sichuan Province‭ ‬-‭ ‬Dashanpu/Lower Shaximiao Formation

When it Lived : Mid Jurassic, 170-160 million years ago

Huayangosaurus, a genus stegosaurian dinosaur that was discovered in the Middle Jurassic period of China, is known as. Named after “Huayang” or “Hua Yang”, an alternative name for Sichuan, the province where it was found, and “saurus”, which means “lizard”. It lived in the Callovian to Bathonian stages around 165 million year ago. This was 20 million years before Stegosaurus, its famous relative, arrived in North America. It was only 4.5m long and smaller than its famous cousin. Huayangosaurus was found in the Lower Shaximiao Formation. It shared the Middle Jurassic landscape along with the Sauropods Shunosaurus (Datousaurus), Omeisaurus, Omeisaurus (Omeisaurus) and Protognathosaurus.


Huayangosaurus taibaii 20050707 07Giloun at en.wikipedia, CC BY-SA 3.0, via Wikimedia Commons


Huayangosaurus, like other stegosaurians was a quadrupedal hermitivore with a small skull. It also had a spiked tail. Huayangosaurus was a stegosaurian like its famous cousin, Stegosaurus. It had the distinctive double row plates that are characteristic of all stegosaurians. These plates rose vertically up the arched back. The plates in Huayangosaurus were more spike-like that those of Stegosaurus. It had two pairs of spikes that extended horizontally from the tail, just like Stegosaurus.

Huayangosaurus was able to use several types of osteoderms. Two rows of small, vertical spikes and plates were found on the neck, tail, and back of Huayangosaurus. The so-called “thagomizer” was a defensive weapon that had two rows of small vertical plates and spikes at its rear. Each flank contained a row smaller osteoderms. This culminated in a long shoulder spine that curves to the rear and curved in front.

Huayangosaurus, which measured 4.5 metres (15 feet) in height, was one of the smallest known stegosaurians.

Twelve stegosaurian individual animals, including their remains, were found in the Dashanpu Quarry close to Zigong in Sichuan between 1979 and 1980. In 1982, Dong Zhiming and Tang Zilu gave them names and descriptions. Huayangosaurus taibaii is the type species. Huayang is an old name for Sichuan. However, the generic name also refers to Hua Yang Guo Zhi, the oldest Chinese gazetteer. Named after Li Bai, a great Chinese poet whose courtesy name is Taibai.

IVPP V6728 was a holotype that was found in a layer from the Lower Shaximiao Formation, which dates back to the Bathonian–Callovian. It is composed of a partial skull. It has a complete skull, three cervical vertebrae and three back vertebrae. There are also four sacral vertebrae. Twenty tail vertebrae. Two metatarsals, three plate, three plates, a spike, and three additional osteoderms. ZDM T7001 was a reference to a number of specimens. It contains a skull with eight cervicals, 16 dorsals and four sacrals. ZDM T7003 is a more complete skull that includes vertebrae. ZDM T7003 is vertebrae. ZDM T7004 is vertebrae. ZDM T7003 has vertebrae. ZDM T7004 has vertebrae. CV 720 is a skull with twenty-eight plates and twenty vertebrae.

The material was reviewed by Susannah Maidment and Guangbiao Youi in 2006. ZDM T7002, CV 721 and CV 721, had no common distinguishing features. They considered them not to be Huayangosaurus. CV 720 was not found in the collection. CV 721 was so different they suggested that it could be a distinct taxon. [4]

The Zigong Dinosaur Museum, Zigong, and the Municipal Museum of Chongqing are home to the skeletons of Huayangosaurus.

Source: Wikipedia