The name "Daanosaurus" means "Da'an lizard" after Da'an district in Zigong, Sichuan and was an extinct genus of dinosaur. It was a brachiosaurid sauropod which lived during the Late Jurassic (Oxfordian - Tithonian stage, about 163 - 145 mya). It lived in what is now China (Sichuan Province), and was similar to Bellusaurus. When it was described, Daanosaurus was placed in the Bellusaurinae, a sub-family of Brachiosauridae that Dong Zhiming had raised in 1990 to house Bellusaurus, or the Klamelisauridae (also now merged with Brachiosauridae), used to house Klamelisaurus and possibly also Daanosaurus and Abrosaurus. More recently, other authors have placed Daanosaurus in the Eusauropoda.
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The type species from the Shaximiao Formation was described in 2005 as Daanosaurus zhangi. Due to the lack of Daanosaurus fossils, the adult size is currently unknown to us. The only specimen was a juvenile.
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