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Osteology of Concavispina biseridens (Reptilia, Thalattosauria) from the Xiaowa Formation (Carnian), Guanling, Guizhou, China

Published online by Cambridge University Press:  20 May 2016

Jun Liu ,
Li-Jun Zhao ,
Chun Li  and
Tao He
Jun Liu
Affiliation:
Key Laboratory of Evolutionary Systematics of Vertebrates, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China,
Li-Jun Zhao
Affiliation:
Zhejiang Museum of Natural History, Hangzhou 310012, China
Chun Li
Affiliation:
Key Laboratory of Evolutionary Systematics of Vertebrates, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China,
Tao He
Affiliation:
Zhejiang Museum of Natural History, Hangzhou 310012, China
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Abstract

A thalattosaur taxon, Concavispina biseridens, was recently named and briefly described. It is described here in detail and compared with other thalattosaurs, especially Xinpusaurus. Concavispina is characterized by a long skull, measuring approximately half the length of presacral portion of the vertebral column, two rows of blunt teeth on the anterior part of the maxilla, and neural spines that have convex anterior or posterior margins and V-shaped notches in their dorsal margins. Concavispina differs from all thalattosaurs except Xinpusaurus in that the anterior end of the maxilla is curved dorsally, less than five cervical vertebrae are present, and the proximal end of the humerus is wider than the distal end. Phylogenetic analysis of 40 characters suggests that Miodentosaurus occupies a basal position within Askeptosauridea, Paralonectes is the basalmost member of Thalattosauridea, Concavispina may form a clade with Xinpusaurus, and Chinese thalattosaurs do not have a close relationship with eastern Pacific forms as suggested by previous studies. Concavispina may have been similar to Xinpusaurus in overall locomotor style, but probably had a poorer swimming ability. Concavispina likely differed from Xinpusaurus in diet, for example by depending on softer food.

Type
Research Article
Information
Journal of Paleontology , Volume 87 , Issue 2 , March 2013 , pp. 341 - 350
Copyright
Copyright © The Paleontological Society 

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References

Cheng, L. 2003. A new species of Triassic Thalattosauria from Guanling, Guizhou. Geological Bulletin of China, 22:274–277. (In Chinese)Google Scholar
Cheng, Y.-N., Wu, X.-C., and Sato, T. 2007. A new thalattosaurian (Reptilian: Diapsida) from the Upper Triassic of Guizhou, China. Vertebrata Palasiatica, 45:246–260. (In Chinese)Google Scholar
Cong, L., Hou, L., Wu, X., and Hou, J. 1998. The gross anatomy of Alligator sinensis Fauvel. Science Press, Beijing, 388p.Google Scholar
Currie, P. J. 1981. Hovasaurus boulei, an aquatic eosuchian from the Upper Permian of Madagascar. Palaeontologia Africana, 24:99–168.Google Scholar
Jiang, D.-Y., Maisch, M. W., Sun, Y.-L., Matzke, A. T., and Hao, W.-C. 2004. A new species of Xinpusaurus (Thalattosauria) from the upper Triassic of China. Journal of Vertebrate Paleontology, 24:80–88.Google Scholar
Liu, J. 1999. Sauropterygian from Triassic of Guizhou, China. Chinese Science Bulletin, 44:1312–1316.Google Scholar
Liu, J. 2001. Postcranial skeleton of Xinpusaurus, p. 1–7. InDeng, T. and Wang, Y.(eds.), Proceedings of the Eighth Annual Meeting of the Chinese Society of Vertebrate Palaeontology. China Ocean Press, Beijing.Google Scholar
Liu, J. 2007. A Juvenile Specimen of Anshunsaurus (Reptilia: Thalattosauria). American Museum Novitates, 3582:1–9.Google Scholar
Liu, J. 2013. On the taxonomy of Xinpusaurus (Reptilia: Thalattosauria). Vertebrata Palasiatica, 53 (1):17–23.Google Scholar
Liu, J. and Rieppel, O. 2001. The second thalattosaur from the Triassic of Guizhou, China. Vertebrata PalAsiatica, 39:77–87.Google Scholar
Liu, J. and Rieppel, O. 2005. Restudy of Anshunsaurus huangguoshuensis (Reptilia: Thalattosauria) from the Middle Triassic of Guizhou, China. American Museum Novitates, 3488:1–34.CrossRefGoogle Scholar
Merriam, J. C. 1904. A new marine reptile from the Triassic of California. Bulletin of the Department of Geology at the University of California, 3:419–421.Google Scholar
Merriam, J. C. 1905. The Thalattosauria: a group of marine reptiles from the Triassic of California. California Academy of Sciences Memoirs, 5:1–38.Google Scholar
Merriam, J. C. 1908. Notes on the osteology of the thalattosaurian genus Nectosaurus. University of California Publications, Bull. Depart. Geol., 5:217–223.Google Scholar
Müller, J. 2005. The anatomy of Askeptosaurus italicus from the Middle Triassic of Monte San Giorgio, and the interrelationships of thalattosaurs (Reptilia, Diapsida). Canadian Journal of Earth Sciences, 42 (7):1347–1367.Google Scholar
Müller, J. 2007. First record of a thalattosaur from the Upper Triassic of Austria. Journal of Vertebrate Paleontology, 27:236–240.Google Scholar
Müller, J., Renesto, S., and Evans, S. E. 2005. The marine diapsid reptile Endennasaurus from the Upper Triassic of Italy. Palaeontology, 48:15–30.Google Scholar
Nicholls, E. L. 1999. A reexamination of Thalattosaurus and Nectosaurus and the relationships of the Thalattosauria (Reptilia: Diapsida). PaleoBios, 19:1–29.Google Scholar
Nicholls, E. L. and Brinkman, D. B. 1993. New thalattosaurs (Reptilia: Diapsida) from the Triassic Sulphur Formation of Wapiti Lake, British Columbia. Journal of Paleontology, 67:263–278.Google Scholar
Peyer, B. 1936a. Die Triasfauna der Tessiner Kalkalpen. X. Clarazia schinzi nov. gen. nov. sp. Abhandlungen der Schweizerischen Paläontologischen Gesellschaft, 57:1–61.Google Scholar
Peyer, B. 1936b. Die Triasfauna der Tessiner Kalkalpen. XI. Hescheleria rübeli nov. gen. nov. sp. Abhandlungen der Schweizerischen Paläontologischen Gesellschaft, 58:1–48.Google Scholar
Renesto, S. 1992. The anatomy and relationships of Endennasaurus acutirostris (Reptilia, Neodiapsida), from the Norian (Late Triassic of Lombardy). Rivista Italiana di Paleontologia e Stratigrafia, 97:409–430.Google Scholar
Rieppel, O. 1987. Clarazia and Hescheleria, a re-investigation of two problematical reptiles from the Middle Triassic of Monte San Giorgio, Switzerland. Palaeontographica A, 195:101–129.Google Scholar
Rieppel, O. and Liu, J. 2006. On Xinpusaurus (Reptilia: Thalattosauria). Journal of Vertebrate Paleontology, 26:200–204.Google Scholar
Rieppel, O., Liu, J., and Bucher, H. 2000. The first record of a thalattosaur reptile from the Late Triassic of southern China (Guizhou Province, PR China). Journal of Vertebrate Paleontology, 20:507–514.Google Scholar
Rieppel, O., Liu, J., and Li, C. 2006. A new species of the thalattosaur genus Anshunsaurus (Reptilia: Thalattosauria) from the Middle Triassic of Guizhou Province, southwestern China. Vertebrata Palasiatica, 44:285–296.Google Scholar
Swofford, D. L. 2001. PAUP∗. Phylogenetic Analysis Using Parsimony (∗ and Other Methods). Sinauer Associates, Sunderland, MA.Google Scholar
Wang, X., Bachmann, G. H., Hagdorn, H., Sander, P. M., Cuny, G., Chen, X., Wang, C., Chen, L., Cheng, L., Meng, F., and Xu, G. 2008. The Late Triassic black shales of the Guanling Area, Guizhou Province, South-West China: A unique marine reptile and pelagic crinoid fossil lagerstatte. Palaeontology, 51:27–61.Google Scholar
Wu, X.-C., Cheng, Y.-N., Sato, T., and Shan, H.-Y. 2009. Miodentosaurus brevis Cheng et al., 2007 (Diapsida: Thalattosauria): Its postcranial skeleton and phylogenetic relationships. Vertebrata Palasiatica, 47:1–20.Google Scholar
Yin, G. Z., Zhou, X. G., and Cao, Z. T. 2000. A preliminary study on the early Late Triassic marine reptiles from Guanlig, Guizhou. Geology Geochemistry, 28 (3):1–23. (In Chinese)Google Scholar
Zhao, L.-J., Liu, J., Li, C. and He, T. 2013. A new thalattosaur, Concavispina biseridens gen. et sp. nov. from Guanling, Guizhou, China. Vertebrata Palasiatica, 51 (1):24–28. (In Chinese)Google Scholar
Zhao, L.-J., Sato, T., Liu, J., Li, C., and Wu, X.-C. 2010. A new skeleton of Miodentosaurus brevis (Diapsida: Thalattosauria) with a further study of the taxon. Vertebrata Palasiatica, 48:1–10.Google Scholar