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- Title
A new Xinjiangchelyid turtle (Testudines, Eucryptodira) from the Jurassic Qigu Formation of the southern Junggar Basin, Xinjiang, north-west China.
- Authors
Matzke, Andreas T.; Maisch, Michael W.; Sun Ge; Pfretzschner, Hans-U.; Stöhr, Henrik
- Abstract
A new eucryptodiran turtle,Xinjiangchelys qiguensissp. nov. from the Upper Jurassic (Oxfordian— ?Kimmeridgian) Qigu Formation of the southern Junggar Basin (north-west China) is described. The type material consists of a partial skeleton, including the complete carapace, plastron, nearly all cervical vertebrae, both scapulae, the pelvis and one ulna. It is clearly identifiable as a basal eucryptodire since it lacks the mesoplastron. It is distinguished from other species ofXinjiangchelysby several autapomorphies of the carapace and plastron, such as the first and fifth vertebrals extending on the peripherals, the plastron with three pairs of gulars, and an intergular which does not contact the hyoplastron. In the postcranium, the scapula with a long acromial and a small scapular process, the pelvis with a short ilial shaft and the elongated cervical vertebrae are characteristic. A new phylogenetic analysis of the in-group phylogeny of the Xinjiangchelyidae is proposed and discussed, resulting in a new classification of the family.Xinjiangchelys(Toxocheloides)narynensisis regarded as anomen dubium.Shartegemysis referred toXinjiangchelys, whereas the holotypes of‘ Plesiochelys’ chungkingensisand‘ P’.latimarginalisare excluded from the genusXinjiangchelysbut included in the Xinjiangchelyidae.
- Subjects
TURTLES; ZOOLOGY; BIOLOGY; PALEONTOLOGY
- Publication
Palaeontology, 2004, Vol 47, Issue 5, p1267
- ISSN
0031-0239
- Publication type
Article
- DOI
10.1111/j.0031-0239.2004.00410.x