Articles/Geology

Chinese Science Bulletin

, Volume 54, Issue 3, pp 430-435

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

  • Xing XuAffiliated withInstitute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences Email author 
  • , Qi ZhaoAffiliated withInstitute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences
  • , Mark NorellAffiliated withAmerican Museum of Natural History
  • , Corwin SullivanAffiliated withInstitute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences
  • , David HoneAffiliated withInstitute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences
  • , Gregory EricksonAffiliated withAmerican Museum of Natural HistoryDepartment of Biological Science, Florida State University
  • , XiaoLin WangAffiliated withInstitute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences
  • , FengLu HanAffiliated withInstitute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of SciencesGraduate University of Chinese Academy of Sciences
  • , Yu GuoAffiliated withInstitute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of SciencesGraduate University of Chinese Academy of Sciences

Rent the article at a discount

Rent now

* Final gross prices may vary according to local VAT.

Get Access

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