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Gasosaurus
''Gasosaurus'' () was a tetanuran dinosaur discovered in Dashanpu, China. The scientific name, meaning "Gas Lizard", honours the gasoline company that found the Dashanpu fossil quarry in Sichuan Province, now named as the Lower Shaximiao Formation. It had strong legs but short arms, and like most theropods, it was a carnivore. It measured between in length, with a weight of around , placing it in the midrange of theropods by size. However, some estimates put its weight as high as , as very little is known about this dinosaur. It lived during the mid-Jurassic period (Bathonian and/ or Callovian stages), around 164 million years ago.
==Discovery and species==
The first and to date only fossils, albeit postcranial (missing the skull), were recovered in 1985 during the construction of a gas facility, which explains the dinosaur's unusual name. The fossils were defined as the type species ''Gasosaurus constructus'' by the paleontologists Dong Zhiming and Tang Zilu. There have still been very few fossils retrieved, so exact details are unknown. Specifically, no skull has been found. Some paleontologists have speculated that ''Gasosaurus'' and ''Kaijiangosaurus'' may be one and the same species. Traditionally thought to be a megalosauroid,〔Dong and Tang, 1985. A new Mid-Jurassic theropod (Gasosaurus constructus gen et sp. nov.) from Dashanpu, Zigong, Sichuan Province, China. Vertebrata PalAsiatica. 23(1), 77-82.〕 Holtz (2000) found it to be a basal coelurosaurian,〔Holtz, 2000. A new phylogeny of the carnivorous dinosaurs. Gaia. 15, 5-61.〕 although later Holtz ''et al.'' (2004) suggested it was a basal carnosaur (possibly a sinraptorid) on the basis of data from undescribed specimens.〔Holtz TR Jr, Molnar RE, Currie PJ. 2004. Basal Tetanurae. In: Weishampel DB, Dodson P, Osmólska H, eds. The dinosauria, 2nd edn. Berkeley, CA: University of California Press, 71–110.〕 It may in fact be the most basal coelurosaurian yet known, or may even be close to the common ancestor of the two groups; in any case, it represents one of the oldest definitive tetanuran theropods.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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