| 词条 | Xinjiangtitan |
| 释义 |
| fossil_range = Middle Jurassic | image = Xinjiangtitan (adjusted).jpg | taxon = Xinjiangtitan | authority = Wu et al., 2013 | type_species = {{extinct}}Xinjiangtitan shanshanesis | type_species_authority = Wu et al., 2013 }}Xinjiangtitan is an extinct genus of mamenchisaurid sauropod known from the Middle Jurassic Qigu Formation in Piqan County of Xinjiang, northwestern China. Estimates of body length for the holotype are approximately {{convert|30|-|32|m|ft|abbr=on}} in length, making Xinjiangtitan one of the longest sauropods known.[1] DiscoveryXinjiangtitan was first described and named by Wu Wen-hao, Zhou Chang-fu, Oliver Wings, Toru Sekiha and Dong Zhiming in 2013 and the type species is Xinjiangtitan shanshanesis. The generic name is derived from Xinjiang where the bones were discovered in 2012, and from titan, giant in Greek mythology. The specific name, shanshanesis, is derived from an alternative name for the county where it was found, Shanshan, named after the ancient Shanshan Kingdom. The specific name is occasionally misspelled as "shanshanensis" or "shashaensis", which are invalid spellings even though the correct form would indeed have been "shanshanensis" rather than shanshanesis, as the Latin suffix "-ensis" meaning "from", was used to create the name. Xinjiangtitan is known solely from the holotype SSV12001, a partial but, apart from some erosion, well preserved in situ postcranial skeleton including the first two caudal vertebrae, all cervical vertebrae, and all dorsal (12) and sacral vertebrae (5), as well as several cervical, dorsal and sacral ribs, a partial left leg (including the femur, tibia, fibula and a metatarsal), left and right pubic bones and right ischium.[1]DescriptionXinjiangtitan was diagnosed based on the following traits: the presence of a ventral keel on the penultimate cervical centrum that forms a small semicircular process under the distal articular facet; both cervical vertebrae are relatively elongated; the sacricostal yoke excepts the first sacral rib; and an extremely robust femur. The series of dorsal vertebrae has a length of 372 centimetres. The thighbone is 165 centimetres long, and the tibia is 98 cm.[1] PhylogenyAmong sauropods, a phylogenetic analysis places Xinjiangtitan as the sister taxon of Mamenchisaurus, the only other mamenchisaurid included. Xinjiangtitan shares several derived characters with diplodocids, including prominent ambiens process of pubis, relatively short hind limb and fourth trochanter on the femur that is caudomedially developed.[1] References1. ^1 2 3 {{Cite journal |last1=Wu |first1=Wen-hao |last2=Zhou |first2=Chang-Fu |last3=Wings |first3=Oliver |last4=Toru |first4=Sekiya |last5=Dong |first5=Zhi-ming |year=2013 |title= A new gigantic sauropod dinosaur from the Middle Jurassic of Shanshan, Xinjiang |journal=Global Geology |volume=32 |issue=3 |pages=437–446 |doi=10.3969/j.issn.1004-5589.2013.03.002 |url=http://www.dinosaurhunter.org/files/globalgeol.-2013-wu_et_al-sauropod_xinjiangtitan__turpan_basin__china.pdf |format=PDF}} {{Portal|Paleontology}}{{Sauropoda}}{{Taxonbar|from=Q15144358}} 5 : Middle Jurassic dinosaurs of Asia|Fossil taxa described in 2013|Mamenchisaurids|Paleontology in Xinjiang|Taxa named by Dong Zhiming |
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