Journal of Ornithology

, Volume 156, Issue 4, pp 1067–1074 | Cite as

Testing the neoflightless hypothesis: propatagium reveals flying ancestry of oviraptorosaurs

Original Article

Abstract

Considerable debate surrounds the numerous avian-like traits in core maniraptorans (oviraptorosaurs, troodontids, and dromaeosaurs), especially in the Chinese Early Cretaceous oviraptorosaur Caudipteryx, which preserves modern avian pennaceous primary remiges attached to the manus, as is the case in modern birds. Was Caudipteryx derived from earth-bound theropod dinosaurs, which is the predominant view among palaeontologists, or was it secondarily flightless, with volant avians or theropods as ancestors (the neoflightless hypothesis), which is another popular, but minority view. The discovery here of an aerodynamic propatagium in several specimens provides new evidence that Caudipteryx (and hence oviraptorosaurs) represent secondarily derived flightless ground dwellers, whether of theropod or avian affinity, and that their presence and radiation during the Cretaceous may have been a factor in the apparent scarcity of many other large flightless birds during that period.

Keywords

Caudipteryx Propatagium Maniraptora Oviraptorosaurs Microraptor Lower Cretaceous 

Zusammenfassung

Die „Neoflightless“-Hypothese im Test: Halsflughaut (Propatagium) offenbart flugfähige Vorfahren der Oviraptorosauria

Es gibt eine ausgiebige Debatte über die zahlreichen vogelähnlichen Eigenheiten der Maniraptora (Oviraptosaurus, Troodontidae, Dromaeosaurus), vor allem des (gefiederten) Oviraptorosauria  Caudipteryx aus der frühen chinesischen Kreidezeit, der genau wie rezente Vögel Handschwingen hatte, die an den Handknochen ansetzen. Stammt Caudipteryx von den nur am Erdboden lebenden Theropoda ab - die unter den Paläontologen vorherrschende Meinung -, oder war er sekundär flugunfähig und stammte von flugfähigen Theropoden ab - die „Neoflightless“-Hypothese, eine alternative, wenn auch nur von Wenigen unterstützte These. Die hier berichtete Entdeckung einer aerodynamischen Halsflughaut bei einigen Exemplaren gibt neue Hinweise darauf, dass Caudipteryx (und damit auch Oviraptorosaurus) einen sekundär flugunfähigen Bodenbewohner darstellte, ganz gleich, ob er näher mit den Theropoden oder den Vögeln verwandt ist. Sein Vorkommen und seine Ausbreitung während der Kreidezeit war möglicherweise ein Faktor im offensichtlichen Mangel an anderen großen, flugunfähigen Vögeln während dieser Periode.

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Copyright information

© Dt. Ornithologen-Gesellschaft e.V. 2015

Authors and Affiliations

  1. 1.Department of BiologyUniversity of North CarolinaChapel HillUSA
  2. 2.The Dinosaur MuseumBlandingUSA

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