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Article: A new specimen of the Triassic pistosauroid Yunguisaurus, with implications for the origin of Plesiosauria (Reptilia, Sauropterygia)

Publication: Palaeontology
Volume: 57
Part: 1
Publication Date: January 2014
Page(s): 55 76
Author(s): Tamaki Sato, Li-Jun Zhao, Xiao-Chun Wu and Chun Li
Addition Information

How to Cite

SATO, T., ZHAO, L., WU, X., LI, C. 2014. A new specimen of the Triassic pistosauroid Yunguisaurus, with implications for the origin of Plesiosauria (Reptilia, Sauropterygia). Palaeontology57, 1, 55–76. doi: 10.1111/pala.12048

Author Information

  • Tamaki Sato - Tokyo Gakugei University, Koganei City, Tokyo, Japan (email:
  • Tamaki Sato - Canadian Museum of Nature, Ottawa, ON, Canada
  • Li-Jun Zhao - Zhejiang Museum of Natural History, Hangzhou, China (email:
  • Xiao-Chun Wu - Canadian Museum of Nature, Ottawa, ON, Canada (email:
  • Chun Li - Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing, China (email:

Publication History

  • Issue published online: 6 JAN 2014
  • Article first published online: 7 MAY 2013
  • Manuscript Accepted: 24 MAR 2013
  • Manuscript Received: 19 MAR 2012

Funded By

KAKENHI. Grant Numbers: 18.6288, 20684023
National Natural Science Foundation of China. Grant Number: 41172027
Tokyo Gakugei University
Canadian Museum of Nature

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  • Adams, D. A. 1997. Trinacromerum bonneri, new species, last and fastest plesiosaur of the Western Interior Seaway. Texas Journal of Science49, 179–198.
  • Alberch, P., Gould, S. J., Oster, G. F. and Wake, D. B. 1979. Size and shape in ontogeny and phylogeny. Paleobiology5, 296–317.
  • Andrews, C. 1910. A descriptive catalogue of the marine reptiles of the Oxford Clay. Part I. British Museum (Natural History), London, 205 pp.
  • Andrews, C. 1913. A descriptive catalogue of the marine reptiles of the Oxford Clay. Part II. British Museum (Natural History), London, 206 pp.
  • Barahona, F. and Barbadillo, L. J. 1998. Inter‐ and intraspecific variation in the post‐natal skull of some lacertid lizards. Zoological Journal (London)245, 393–405.
  • Bardet, N. 1994. Extinction events among Mesozoic marine reptiles. Historical Biology7, 313–324.
  • Baur, G. 1887–1890. Pistosauridae Baur. 498–499. In Zittel, K. A. (ed.). Handbuch der palaeontologie 3, R. Oldenbourg, München, 900 pp.
  • Benson, R. B. J. and Butler, R. J. 2011. Uncovering the diversification history of marine tetrapods: ecology influences the effect of geological sampling biases. Special Publications of the Geological Society358, 191–207.
  • Benson, R. B. J., Bates, K. T., Johnson, M. R. and Withers, P. J. 2011. Cranial anatomy of Thalassiodracon hawkinsii (Reptilia, Plesiosauria) from the Early Jurassic of Somerset, United Kingdom. Journal of Vertebrate Paleontology31, 562–574.
  • Benson, R. B. J., Evans, M. and Druckenmiller, P. S. 2012. High diversity, low disparity and small body size in plesiosaurs (Reptilia, Sauropterygia) from the Triassic–Jurassic boundary. PLoS One 7, doi:10.1371/journal.pone.0031838
  • Bever, G. S. 2008. Postnatal Ontogeny of the Skull in the Extant North American Turtle Sternotherus odoratus (Cryptodira: Kinosternidae). Bulletin of the American Museum of Natural History330, 1–97.
  • Bickelmann, C., Mueller, J. and Reisz, R. R. 2009. The enigmatic diapsid Acerosodontosaurus piveteaui (Reptilia: Neodiapsida) from the Upper Permian of Madagascar and the paraphyly of ‘younginiform’ reptiles. Canadian Journal of Earth Sciences46, 651–661.
  • Brinkman, D. B., Zhao, X.‐J. and Nicholls, E. L. 1992. A primitive ichthyosaur from the Lower Triassic of British Columbia, Canada. Palaeontology35, 465–474.
  • Caldwell, M. W. 1997. Modified perichondral ossification and evolution of paddle‐like limbs in ichthyosaurs and plesiosaurs. Journal of Vertebrate Paleontology17, 534–547.
  • Carroll, R. L. 1981. Plesiosaur ancestors from the Upper Permian of Madagascar. Philosophical Transactions of the Royal Society of London, Series B293, 315–383.
  • Carroll, R. L. 1988. Vertebrate paleontology and evolution. W. H. Freeman and Company, USA, 698 pp.
  • Carroll, R. L. and Dong, Z.‐M. 1991. Hupesuchus, an enigmatic aquatic reptile from the Triassic of China, and the problem of establishing relationships. Philosophical Transactions of the Royal Society of London, Series B331, 131–153.
  • Carroll, R. L. and Gaskill, P. 1985. The nothosaur Pachypleurosaurus and the origin of plesiosaurs. Philosophical Transactions of the Royal Society of London, Series B309, 343–393.
  • Carte, A. and Baily, W. H. 1863. Description of a new species of Plesiosaurus, from the Lias, near Whitby, Yorkshire. The Journal of the Royal Dublin Society4, 160–170.
  • Cheng, Y.‐N., Sato, T., Wu, X.‐C. and Li, C. 2006. First complete pistosauroid from the Triassic of China. Journal of Vertebrate Paleontology26, 501–504.
  • Cheng, L., Chen, X.‐H. and Cai, Y.‐J. 2012. A New Eosauropterygian (Diapsida: Sauropterygia) from the Middle Triassic of Luoping, Yunnan Province, China. Journal of Earth Science23, 33–40.
  • Coney, P. J., Jones, D. L. and Monger, J. W. H. 1980. Cordilleran suspect terranes. Nature288, 329–333.
  • Cox, C. B. and Smith, D. G. 1973. A review of the Triassic vertebrate faunas of Svalbard. Geological Magazine110, 405–418.
  • Cruickshank, A. R. I. 1994. Cranial anatomy of the Lower Jurassic pliosaur Rhomaleosarus megacephalus (Stutchbury) (Reptilia: Plesiosauria). Philosophical Transactions of the Royal Society of London, Series B343, 247–260.
  • Currie, P. J. 1981. Hovasaurus boulei, an aquatic eosuchian from the Upper Permian of Madagascar. Paleontologia Africana24, 99–168.
  • Dalla Vecchia, F. M. 2006. A new sauropterygian reptile with plesiosaurian affinity from the Late Triassic of Italy. Revista Italiana di Paleontologia e Stratigrafia112, 207–225.
  • Dalrymple, G. H. 1977. Intraspecific variation in the cranial feeding mechanism of turtles of the genus Trionyx (Reptilia, Testudines, Trionychidae). Journal of Herpetology11, 255–285.
  • Diedrich, C. G. 2011. Fossil middle triassic ‘sea cows’ – placodont reptiles as macroalgae feeders along the north‐western Tethys coastline with Pangaea and in the Germanic basin. Natural Science3, 8–26.
  • Druckenmiller, P. S. and Russell, A. P. 2008. Skeletal anatomy of an exceptionally complete specimen of a new genus of plesiosaur from the Early Cretaceous (Early Albian) of northeastern Alberta, Canada.Palaeontographica Abteilung A283, 1–33.
  • Gaffney, E. S. 1990. The comparative osteology of the Triassic turtle ProganochelysBulletin of the American Museum of Natural History194, 1–263.
  • Godfrey, S. J. 1984. Plesiosaur subaqueous locomotion, a reappraisal. Neues Jahrbuch fuer Geologie und Palaeontologie Monatshefte1984, 661–672.
  • Gould, S. J. 1977. Ontogeny and phylogeny. The Belknap Press of Harvard University Press, Cambridge, MA, 640 pp.
  • Hagdorn, H. and Rieppel, O. 1999. Stratigraphy of marine reptiles in the Triassic of Central Europe. Zentralbatt fur Geologie und Paläontologie Teil I1998, 651–678.
  • Jiang, D.‐Y., Maisch, M. W. and Sun, Y.‐L. 2004. A new species of Xinpusaurus (Thalattosauria) from the Upper Triassic of China. Journal of Vertebrate Paleontology24, 80–88.
  • Li, C., Wu, X.‐C., Rieppel, O., Wang, L.‐T. and Zhao, L.‐J. 2008. An ancestral turtle from the Late Triassic of southwestern China. Nature456, 497–501.
  • Li, C., Rieppel, O., Wu, X.‐C., Zhao, L.‐J. and Wang, L.‐T. 2011. A new Triassic marine reptile from southwestern China. Journal of Vertebrate Paleontology31, 303–312.
  • Li, C., Jiang, D.‐Y, Cheng, L., Wu, X.‐C. and Rieppel, O. in press. A new species of Largocephalosaurus (Diapsida: Saurosphargidae), with implication to the morphological diversity and phylogeny of the group.Geological Magazine.
  • Lin, K.‐B. and Rieppel, O. 1998. Functional morphology and ontogeny of Keichousaurus hui (Reptilia, Sauropterygia). Fieldiana (Geology) N.S.39, 1–35.
  • Liu, G.‐B., Yin, G.‐Z., Wang, X.‐H., Wang, S.‐Y. and Huang, L.‐Z. 2002. On a new marine reptile from Middle Triassic Yangliujing Formation of Guizhou, China. Geological Journal of China Universities8, 220–226.
  • Liu, J., Rieppel, O., Jiang, D.‐Y., Aitchison, J. C., Motani, R., Zhang, Q.‐Y., Zhou, C.‐Y. and Sun, Y.‐Y. 2011. A new pachypleurosaur (Reptilia: Sauropterygia) from the lower Middle Triassic of southwestern China and the phylogenetic relationships of Chinese pachypleurosaurs. Journal of Vertebrate Paleontology31, 292–302.
  • McGowan, C. and Motani, R. 2003. Ichthyopterygia. Handbuch der paläoherpetologie 8. Verlag Dr. Friedrich Pfeil, München, 175 pp.
  • Merck, J. W. Jr 1997. A phylogenetic analysis of the euryapsid reptiles. Unpublished PhD thesis, University of Texas at Austin, 785 pp.
  • Nicholls, E. L. 1999. A reexamination of Thalattosaurus and Nectosaurus and the relationships of the Thalattosauria (Reptilia: Diapsida). PaleoBios19, 1–29.
  • O'Keefe, F. R. 2001. A cladistic analysis and taxonomic revision of the Plesiosauria (Reptilia: Sauropterygia). Acta Zoologica Fennica213, 1–63.
  • Owen, R. 1860. Palaeontology; or a systematic summary of extinct animals and their geologic remains. Adam and Charles Black, Edinburgh, 420 pp.
  • Owen, R. 1865. Monograph of the fossil Reptilia of the Liassic formations, Part 1st, Sauropterygians. Palaeontological Society, London, 40 pp.
  • Peyer, B. 1939. Die Triasfauna der Tessiner Kalkalpen, XIV, Paranothosaurus amsleri nov. gen. nov. spec. Abhandlungen der Schweizerischen Palaontologischen Gesellschaft55, 1–87.
  • Renesto, S. 1992. The anatomy and relationships of Endennasaurus acutirostris (Reptilia, Neodiapsida) from the Norian (Late Triassic) of Lombardy. Rivista Italiana di Paleontologia e Stratigrafia97, 409–430.
  • Rieppel, O. 1989. Helveticosaurus zollingeri Peyer (Reptilia, Diapsida) skeletal paedomorphosis, functional anatomy and systematic affinities. Palaeontographica Abteilung A208, 123–152.
  • Rieppel, O. 1998a. Corosaurus alcovensis Case and the interrelationships of Triassic stem‐group Sauropterygia (Diapsida). Zoological Journal of the Linnean Society124, 1–41.
  • Rieppel, O. 1998b. The status of the sauropterygia reptile genera Ceresiosaurus, Lariosaurus, and Silvestrosaurus from the Middle Triassic of Europe. Fieldiana (Geology) N.S.38, 1–46.
  • Rieppel, O. 1999. The sauropterygian genera Chinchenia, Kwangsisaurus, and Sanchiaosaurus from the Lower and Middle Triassic of China. Journal of Vertebrate Paleontology19, 321–337.
  • Rieppel, O. 2000a. Sauropterygia I: placodontia, pachypleurosauria, nothosauroidea, pistosauroidea. Handbuch der paläoherpetologie 12. Verlag Dr. Friedrich Pfeil, München, 134 p.
  • Rieppel, O. 2000b. Paraplacodus and the phylogeny of the Placodontia (Reptilia: Sauropterygia). Zoological Journal of the Linnean Society130, 635–659.
  • Rieppel, O. and Hagdorn, H. 1997. Paleobiogeography of Middle Triassic Sauropterygia in central and western Europe. 121–144. In Callaway, J. M. and Nicholls, E. L. (eds). Ancient marine reptiles. Academic Press, San Diego, 501 pp.
  • Rieppel, O. and Reisz, R. R. 1999. The Origin and early evolution of turtles. Annual Review of Ecology and Systematics30, 1–22.
  • Rieppel, O., Sander, P. M. and Storrs, G. W. 2002. The skull of the pistosaur Augustasaurus from the Middle Triassic of northwestern Nevada. Journal of Vertebrate Paleontology22, 577–592.
  • Sander, P. M. 1989. The pachypleurosaurids (Reptilia: Nothosauria) from the Middle Triassic of Monte San Giorgio (Switzerland) with the description of a new species. Philosophical Transactions of the Royal Society of London, Series B325, 561–666.
  • Sander, P. M., Rieppel, O. C. and Bucher, H. 1997. A new pistosaurid (Reptilia: Sauropterygia) from the Middle Triassic of Nevada and its implication for the origin of the plesiosaurs. Journal of Vertebrate Paleontology17, 526–533.
  • Sato, T. 2002. Description of plesiosaurs (Reptilia; Sauropterygia) from the Bearpaw Formation (Campanian–Maastrichtian) and a phylogenetic analysis of the Elasmosauridae. Unpublished PhD thesis, University of Calgary, Canada, 391 pp.
  • Sato, T. 2003. Terminonatator ponteixensis, a new elasmosaur (Reptilia; Sauropterygia) from the Upper Cretaceous of Saskatchewan. Journal of Vertebrate Paleontology23, 89–103.
  • Sato, T. 2005. A new polycotylid plesiosaur (Reptilia; Sauropterygia) from the Upper Cretaceous Bearpaw Formation in Saskatchewan, Canada. Journal of Paleontology79, 969–980.
  • Sato, T., Cheng, Y.‐N., Wu, X.‐C. and Li, C. 2010. Osteology of Yunguisaurus Cheng et al., 2006 (Reptilia; Sauropterygia), a Triassic pistosauroid from China. Paleontological Research14, 179–195.
  • Schwermann, L. and Sander, P. M. 2011. Osteologie und Phylogenie von Westphaliasaurus simonsensii: ein neuer Plesiosauride (Sauropteryiga) aus dem Unterren Jura (Pliensbachium) von Sommersell (Kreis Hoxter), Nordrhein‐Westfalen, Deutschland. Geologie und Paläontologie in Westfalen79, 1–56.
  • Seeley, H. G. 1874. Note on some of the generic modifications of the plesiosaurian pectoral arch. Quarterly Journal of the Geological Society of London30, 436–449.
  • Smith, A. S. and Dyke, G. J. 2008. The skull of the giant predatory pliosaur Rhomaleosaurus cramptoni: implications for the plesiosaur phylogenetics. Naturwissenschaften95, 975–980.
  • Smith, A. S. and Vincent, P. 2010. A new genus of pliosaur (Reptilia: Sauropterygia) from the Lower Jurassic of Holzmaden, Germany. Palaeontology53, 1049–1063.
  • Storrs, G. W. 1991. Anatomy and relationships of Corosaurus alcovensis (Diapsida: Sauropterygia) and the Triassic Alcova Limestone of Wyoming. Bulletin of the Peabody Museum of Natural History44, 1–151.
  • Storrs, G. W. 1993. Function and phylogeny in sauropterygian (Diapsida) evolution. American Journal of Science293‐A, 63–90.
  • Storrs, G. W. and Taylor, M. A. 1996. Cranial anatomy of a new plesiosaur genus from the Lowermost Lias (Rhaetian/Hettangian) of Street, Somerset, England. Journal of Vertebrate Paleontology16, 403–420.
  • Storrs, G. W. 1997. Morphological and taxonomic clarification of the genus Plesiosaurus. 145–190. In Callaway, J. M. and Nicholls, E. L. (eds). Ancient marine reptiles. Academic Press, San Diego, 501 pp.
  • Stutchbury, S. 1846. Description of a new species of Plesiosaurus, in the museum of the Bristol Institution. Quarterly Journal of the Geological Society of London2, 411–417.
  • Sues, H.‐D. 1987. Postcranial skeleton of Pistosaurus and interrelationships of the Sauropterygia (Diapsida). Zoological Journal of the Linnean Society90, 109–131.
  • Swofford, D. L. 2002. PAUP (Phylogenetic Analysis Using Parsimony) version 4.0 beta (software). Sinauer Associates, Sunderland, MA.
  • Taylor, M. A. 1992. Functional anatomy of the head of the large aquatic predator Rhomaleosaurus zetlandicus (Plesiosauria, Reptilia) from the Toarcian (Lower Jurassic) of Yorkshire, England. Philosophical Transactions of the Royal Society of London, Series B335, 247–280.
  • Wang, X.‐F., Bachman, G. H., Hagdorn, H., Sander, P. M., Cuny, G., Cheng, X.‐H., Wang, C.‐S., Chen, L.‐D., Cheng, L., Meng, F.‐S. and Xu, G.‐H. 2008. The Late Triassic black shales of the Guanling area, Guizhou Province, south‐west China: a unique marine reptile and pelagic crinoids fossil lagerstätte. Palaeontology51 (16), 27–61.
  • Watson, D. M. S. 1924. The elasmosaurid shoulder‐girdle and fore‐limb. Proceedings of the Zoological Society1924, 885–917.
  • Welles, S. P. 1943. Elasmosaurid plesiosaurs with description of new material from California and Colorado. Memoirs of the University of California13, 125–234.
  • White, T. E. 1940. Holotype of Plesiosaurus longirostris Blake, and classification of the plesiosaurs. Journal of Paleontology14, 451–467.
  • Wu, X.‐C., Li, Z., Zhou, B.‐C. and Dong, Z.‐M. 2003. A polydactylous amniote from the Triassic period. Nature426, 516.
  • Wu, X.‐C., Cheng, Y.‐N., Li, C., Zhao, L.‐J. and Sato, T. 2011. New information on Wumengosaurus delicatomandibularis Jiang et al., 2008 (Diapsida: Sauropterygia), with a revision of the osteology and phylogeny of the taxon. Journal of Vertebrate Paleontology31, 70–83.
  • Zhao, L.‐J., Sato, T. and Li, C. 2008a. The most complete pistosauroid skeleton from the Triassic of Yunnan, China. Acta Geologica Sinica (English Edition)82, 283–286.
  • Zhao, L.‐J., Li, C., Liu, J. and He, T. 2008b. A new armored placodont from the Middle Triassic of Yunnan Province, southwestern China. Vertebrata PalAsiatica46, 171–177.
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