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A therizinosauroid dinosaur with integumentary structures from China

Abstract

Therizinosauroidea (‘segnosaurs’) are little-known group of Asian dinosaurs with an unusual combination of features that, until recently, obscured their evolutionary relationships. Suggested affinities include Ornithischia1, Sauropodomorpha2,3, Theropoda4,5,6,7,8,9,10,11 and Saurischia sedis mutabilis12. Here we describe a new therizinosauroid from the Yixian Formation (Early Cretaceous, Liaoning, China)13. This new taxon provides fresh evidence that therizinosauroids are nested within the coelurosaurian theropods8,9,10,11. Our analysis suggests that several specialized therizinosauroid characters, such as the Sauropodomorpha-like tetradactyl pes1,2, evolved independently within this group. Most interestingly, this new dinosaur has integumentary filaments as in Sinosauropteryx14,15. This indicates that such feather-like structures may have a broad distribution among non-avian theropods, and supports the hypothesis that the filamentous integumentary structures may be homologous to the feathers of birds14,15.

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Figure 1: Beipiaosaurus inexpectus (V11559, holotype).
Figure 2: Beipiaosaurus inexpectus.
Figure 3: Beipiaosaurus inexpectus.
Figure 4: Phylogenetic relationships of Beipiaosaurus inexpectus.

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References

  1. Paul, G. S. The segnosaurian dinosaurs: relics of the prosauropod-ornithischian transition. J. Vert. Paleontol. 4, 507–515 (1984).

    Article  Google Scholar 

  2. Gauthier, J. A. Saurischian monophyly and the origin of birds. Mem. Calif. Acad. Sci. 8, 1–55 (1986).

    Google Scholar 

  3. Sereno, P. C. Prosauropod monophyly and basal sauropodomorph phylogeny. J. Vert. paleontol.(suppl.) 9, 38A (1989).

    Google Scholar 

  4. Perle, A. Segnosauridae—a new family of theropods from the Late Cretaceous of Mongolia. Trans. Joint Soviet–Mongolian Palaeontological Expedition 8, 45–55 (1979).

    Google Scholar 

  5. Perle, A. Anew segnosaurid from the Upper Cretaceous of Mongolia. Trans. Joint Soviet–Mongolian Palaeontological Expedition 15, 28–39 (1981).

    Google Scholar 

  6. Barsbold, R. & Perle, A. Segnosauria, a new infraorder of carnivorous dinosaurs. Acta Palaeontol. Pol. 25(2), 187–195 (1980).

    Google Scholar 

  7. Barsbold, R. Carnivorous dinosaurs from the Cretaceous of Mongolia. Trans. Joint Soviet–Mongolian Palaeontological Expedition 19, 1–116 (1983).

    Google Scholar 

  8. Russell, D. A. & Dong, Z. The affinities of a new theropod from the Alxa Desert, Inner Mongolia, China. Can. J. Earth Sci. 30, 2107–2127 (1993).

    Article  ADS  Google Scholar 

  9. Clark, J. M., Perle, A. & Norell, M. A. The skull of Erlicosaurus andrewsi, a Late Cretaceous “Segnosaur” (Theropod: Therizinosauridae) from Mongolia. Am. Mus. Novit. 3115, 1–39 (1994).

    Google Scholar 

  10. Sues, H.-D. On Chirostenotes, a Late Cretaceous Oviraptorosaur (Dinosauria: Theropod) from Western North America. J. Vert. Paleontol. 17, 498–716 (1997).

    Article  Google Scholar 

  11. Makovicky, P. & Sues, H.-D. Anatomy and phylogenetic relationships of the theropod dinosaur Microvenator celer from the Lower Cretaceous of Montana. Am. Mus. Novit. 3240, 1–27 (1998).

    Google Scholar 

  12. Barsbold, R. & Maryanska, T. in The Dinosauria (eds Weishampel, D. B., Dodson, P. & Osmolska, H.) 408–415 (Univ. California Press, Berkeley, (1990).

    Google Scholar 

  13. Swisher, C. C., Wang, Y.-q., Wang, X.-, Xu, X. & Wang, Y. 40Ar/39Ar dating of the lower Yixian Fm., Liaoning Province, northeastern China. Chinese Sci. Bull. (suppl.) 43, 125 (1998).

    Article  Google Scholar 

  14. Ji, Q. & Ji, S. A. On discovery of the earliest bird fossil in China and the origin of birds. Chinese Geol. 233, 30–33 (1996).

    Google Scholar 

  15. Chen, P.-j., Dong, Z.-m. & Zhen, S.-A. An exceptionally well preserved theropod dinosaur from the Yixian Formation of China. Nature 391, 147–152 (1998).

    Article  ADS  CAS  Google Scholar 

  16. Ji, Q., Currie, P. J., Norell, M. A. & Ji, S.-A. Two feathered dinosaurs from northeastern China. Nature 393, 753–761 (1998).

    Article  ADS  Google Scholar 

  17. Martin, L. D. in Origins of Higher Groups of Tetrapods (eds Schultz, H.-P. & Treube, L.) 485–540 (Cornell Univ. Press, Ithaca, N. Y., (1991).

    Google Scholar 

  18. Bellairs, A. D'A. & Jenkin, C. R. in Biology and Comparative Physiology of Birds Vol. 9 (ed. Marshall, A.) 241–300 (Academic, New York, (1960).

    Book  Google Scholar 

  19. Perle, A., Chiappe, L. M., Barsbold, R., Clark, J. M. & Norell, M. A. Skeletal morphology of Mononykus olecranus (Theropod, Avialae) from the Late Cretaceous of Mongolia. Am. Mus. Novit 3105, 1–29 (1994).

    Google Scholar 

  20. Ostrom, J. H. Osteology of Deinonychus antirrhopus, an unusual theropod from the Lower Cretaceous of Montana. Bull. Peabody Mus. Nat. Hist., Yale Univ. 30, 1–165 (1969).

    Google Scholar 

  21. Ji, Q. & Ji, S. A. Protarchaeopterygid bird (Protarchaeopteryx gen. nov.)-fossil remains of archaeopterygids from China. Chinese Geol. 238, 38–41 (1997).

    Google Scholar 

  22. Russell, D. A. in Encyclopedia of Dinosaurs (eds Currie, P. J. & Padian, K.) 729–730 (Academic, San Diego, (1997).

    Google Scholar 

  23. Norell, M. & Makovicky, P. J. Important features of the Dromaeosaur skeleton: information from a new specimen. Am. Mus. Novit. 3215, 1–28 (1997).

    Google Scholar 

  24. Chiappe, L., Norell, M. A. & Clark, J. Phylogenetic position of Mononykus (Aves: Alvarezauridae) from the Late Cretaceous of the Gobi Desert. Mem. Queensland Mus. 39, 557–582 (1996).

    Google Scholar 

  25. Zhao, X. & Xu, X. The oldest coelurosaurian. Nature 394, 234–235 (1998).

    Article  ADS  CAS  Google Scholar 

  26. Unwin, D. M. Feathers, filaments and theropod dinosaurs. Nature 391, 119–120 (1998).

    Article  ADS  CAS  Google Scholar 

  27. Gibbons, A. Plucking the feathered dinosaur. Science 278, 1229 (1997).

    ADS  Google Scholar 

Download references

Acknowledgements

We thank J. Clark for advice and reviewing the manuscript; Z.-X. Luo for improving the organization and language of the manuscript as well as the use of PAUP 3.11; Z.-H. Zhou and O.Rauhut for discussions; P. Currie, M. Norell, P. Sereno, X.-C. Wu and H. Osmolska for reviews and comments; and the Liaoxi expedition members of the IVPP. Photographs were taken by J. Zhang, electronic photography by L. Oyang, and line drawings are by R.-S. Li, Y.-T. Li, H.-J. Wang and J.-Z. Ding prepared the specimen. This study was supported by research grants from the Chinese Academy of Sciences and the National Natural Science Foundation of China.

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Correspondence to Xing Xu.

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Xu, X., Tang, Zl. & Wang, Xl. A therizinosauroid dinosaur with integumentary structures from China. Nature 399, 350–354 (1999). https://doi.org/10.1038/20670

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