| Yuanmousaurus Temporal range: Middle Jurassic
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| Size | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | †Sauropodomorpha |
| Clade: | †Sauropoda |
| Family: | †Mamenchisauridae |
| Genus: | †Yuanmousaurus Lü et al., 2006 |
| Species: | †Y. jiangyiensis
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| Binomial name | |
| †Yuanmousaurus jiangyiensis Lü et al., 2006
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Yuanmousaurus ("Yuanmou lizard") was a sauropod dinosaur from the Middle Jurassic period of China. It is known from incomplete remains, recovered in 2000 from the Zhanghe Formation in Yuanmou County in Yunnan Province. Yuanmousaurus was a relatively large sauropod and may have reached about 17 meters (56 ft) in length. It was a basal member of the Sauropoda, but its exact systematic position is unclear. A recent study placed Yuanmousaurus within the family Mamenchisauridae.[1] It may be a dubious genus. The only and type species was Yuanmousaurus jiangyiensis.[2]