What is Yangchuanosaurus?
{{italictitle}} {{Taxobox | fossil_range = [[Jurassic]]<br/>175.6{{ndash}}154 mya | image = Yangchuanosaurus zigongensis.jpg | image_width = 250px | image_caption = ''Y. zigongensis'' |regnum = [[Animal]]ia |classis = [[Reptile|Sauropsida]] |superordo = [[Dinosaur]]ia |ordo = [[Saurischia]] |subordo = [[Theropoda]] |infraordo = [[Carnosauria]] |familia = [[Metriacanthosauridae]] |genus = ''Yangchuanosaurus''}} [[File:Yangchuanosaurus shangyouensis.JPG|thumb|240px|''Yangchuanosaurus shangyouensis'' in [[Hong Kong]] Science Museum.]] '''''Yangchuanosaurus''''' was a [[genus]] of [[theropod]] [[dinosaur]] from the [[Jurassic]] of [[China]]. It was a fairly typical [[carnosaur]], with a large head, sharp, serrated teeth, and relatively short arms (though not as short as those of ''[[Tyrannosaurus]]''). It was the largest [[predator]] in its part of the world. ''Yangchuanosaurus'' probably preyed on [[sauropod]]s, such as ''[[Mamenchisaurus]]'', or [[stegosaur]]s, such as ''[[Tuojiangosaurus]]''. There are two [[species]]. ''Y. zigongensis'' is from the [[Middle Jurassic]], and ''Y. shangyouensis'' is from the [[Upper Jurassic]]. Specimens were collected from the Dashanpu Dinosaur Quarry of [[Zigong]], [[Sichuan]]. The [[Middle Jurassic]] ''Y. zigongensis'' is known from four incomplete specimens. There are two specimens of the [[Upper Jurassic]] ''Y. shangyouensis'', which were at first put into separate species. Later analysis showed they were probably different ages or variations of the same species.<ref>Carrano M.T; Benson R B.J. & Sampson S.D. 2012. The phylogeny of Tetanurae (Dinosauria: Theropoda). ''Journal of Systematic Palaeontology'' '''10''' (2): 211–300. [http://www.tandfonline.com/doi/abs/10.1080/14772019.2011.630927#.Ukq4GNv-XBY]</ref> The first [[skull]] is 82&nbsp;cm (2.7&nbsp;ft) long, and its total body length about 8&nbsp;m (26&nbsp;ft).<ref>Dong, Zhiming''et al'' 1978. A new carnosaur from Yongchuan County, Sichuan Province. ''Ke Xue Tong Bao'' '''23''' (5): 302–04.</ref> The other specimen wa