Tuojiangosaurus, meaning “Tuo River lizard,” is a genus of stegosaurid dinosaur from the Late Jurassic Period. It was found in the Upper Shaximiao Formation of what is now Sichuan Province, China. The type species, T. multispinus (which is also the only known species) was named in 1977, based on two specimens.

A mounted skeleton of T. multispinus is on display at the Municipal Museum of Chongqing in China. A mounted cast is also on display at the Natural history Museum in London.

Tuojiangosaurus is physically similar to the North American Stegosaurus and is the best understood of the Chinese stegosaurids. It stood 6.6 feet high and 23 feet long. It weighed around 4.4 tons.

Tuojiangosaurus had two rows of pointed plates along the spine, which were taller over the hip region. It also had two outward-pointed spikes on each side of the end of the tail, angled at about 45 degrees to the vertical. In stegosaurids, this tail-spike arrangement has become known as the “thagomizer.” It also had the typical narrow head, bulky body, and low teeth found in other stegosaurids.

It has been suggested that due to a lack of tall spines for muscle attachment that was found on the vertebrae of Stegosaurus, Tuojiangosaurus was probably not able to rear up on its hind legs like that dinosaur. If the case is true, it would have most likely eaten low-lying, ground vegetation.

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