Chinese Science Bulletin

, Volume 54, Issue 3, pp 430–435

A new feathered maniraptoran dinosaur fossil that fills a morphological gap in avian origin

Authors

    • Institute of Vertebrate Paleontology and PaleoanthropologyChinese Academy of Sciences
  • Qi Zhao
    • Institute of Vertebrate Paleontology and PaleoanthropologyChinese Academy of Sciences
  • Mark Norell
    • American Museum of Natural History
  • Corwin Sullivan
    • Institute of Vertebrate Paleontology and PaleoanthropologyChinese Academy of Sciences
  • David Hone
    • Institute of Vertebrate Paleontology and PaleoanthropologyChinese Academy of Sciences
  • Gregory Erickson
    • American Museum of Natural History
    • Department of Biological ScienceFlorida State University
  • XiaoLin Wang
    • Institute of Vertebrate Paleontology and PaleoanthropologyChinese Academy of Sciences
  • FengLu Han
    • Institute of Vertebrate Paleontology and PaleoanthropologyChinese Academy of Sciences
    • Graduate University of Chinese Academy of Sciences
  • Yu Guo
    • Institute of Vertebrate Paleontology and PaleoanthropologyChinese Academy of Sciences
    • Graduate University of Chinese Academy of Sciences
Articles/Geology

DOI: 10.1007/s11434-009-0009-6

Cite this article as:
Xu, X., Zhao, Q., Norell, M. et al. Chin. Sci. Bull. (2009) 54: 430. doi:10.1007/s11434-009-0009-6

Abstract

Recent fossil discoveries have substantially reduced the morphological gap between non-avian and avian dinosaurs, yet avians including Archaeopteryx differ from non-avian theropods in their limb proportions. In particular, avians have proportionally longer and more robust forelimbs that are capable of supporting a large aerodynamic surface. Here we report on a new maniraptoran dinosaur, Anchiornis huxleyi gen. et sp. nov., based on a specimen collected from lacustrine deposits of uncertain age in western Liaoning, China. With an estimated mass of 110 grams, Anchiornis is the smallest known non-avian theropod dinosaur. It exhibits some wrist features indicative of high mobility, presaging the wing-folding mechanisms seen in more derived birds and suggesting rapid evolution of the carpus. Otherwise, Anchiornis is intermediate in general morphology between non-avian and avian dinosaurs, particularly with regard to relative forelimb length and thickness, and represents a transitional step toward the avian condition. In contrast with some recent comprehensive phylogenetic analyses, our phylogenetic analysis incorporates subtle morphological variations and recovers a conventional result supporting the monophyly of Avialae.

Keywords

Early Cretaceous maniraptoran theropod coelurosaurian phylogeny wrist evolution avian origin

Copyright information

© Science in China Press and Springer-Verlag GmbH 2008