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Redescription of Gigantspinosaurus sichuanensis (Dinosauria, Stegosauria) from the Late Jurassic of Sichuan, Southwestern China
  修订日期:2017-12-12  点此下载全文
引用本文:HAO Baoqiao,PENG Guangzhao,YE Yong,YOU Hailu.2018.Redescription of Gigantspinosaurus sichuanensis (Dinosauria, Stegosauria) from the Late Jurassic of Sichuan, Southwestern China[J].ACTA GEOLOGICA SINICA(English edition),92(2):431~441
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作者单位E-mail
HAO Baoqiao 1 Zigong Dinosaur Museum, Zigong 643013, Sichuan, China haobaoqiao1984@163.com 
PENG Guangzhao 1 Zigong Dinosaur Museum, Zigong 643013, Sichuan, China  
YE Yong 1 Zigong Dinosaur Museum, Zigong 643013, Sichuan, China  
YOU Hailu 2 Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China 3 CAS Center for Excellence in Life and Paleoenvironment, Beijing 100044, China 4 University of Chinese Academy of Sciences, Beijing 100049, China  
 
Abstract:Gigantspinosaurus sichuanensis is one of the six Stegosauria genera discovered from the Sichuan basin, which preserves the first skin impressions of stegosaurs around the world and a huge pair of ‘comma’ -shaped parascapular spines kept in situ, and being named after the latter feature. The holotype was firstly named and reported in an abstract of a lecture by Ouyang, 1992, since when it has never been detailed studied and the taxonomic position of Gigantspinosaurus is also vague. The morphological redescription shows that G. sichuanensis is a medium-sized stegosaur, with external mandibular foramen developed. The ratio of femur to humerus is large, and the intersacral fenestrae are big. According to the wear degree of teeth, the holotype of G. sichuanensis is regarded as an adult individual. On the basis of the recent data matrix of stegosaurs and the characters revisions of G. sichuanensis, its phylogenetic position has been determined again. By our detailed morphological and phylogenetic analysis, G. sichuanensis is considered to inherit some primitive traits, but it is more derived than Huayangosaurus, and located in a transitional position between Huayangosaurus and Tuojiangosaurus, as a kind of evolved stegosaurs. The ancestors of Stegosauria are small and quadruped, with primitive ornithopod-like skull, and grow leaf-shaped teeth, a large number of bone plates.
keywords:Gigantspinosaurus, Sichuan basin, systematics, transitional type, adult individual
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