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Related Experiment Videos

Feather quill knobs in the dinosaur Velociraptor.

Alan H Turner1, Peter J Makovicky, Mark A Norell

  • 1Division of Paleontology, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024-5192, USA. turner@amnh.org

Science (New York, N.Y.)
|September 22, 2007
PubMed
Summary
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Feathered dinosaurs, like Velociraptor mongoliensis, are known, but evidence in larger species is scarce. New findings reveal quill knobs on Velociraptor forearms, confirming feathers in this larger, flightless theropod dinosaur.

Area of Science:

  • Paleontology
  • Evolutionary Biology
  • Dinosaur Paleobiology

Background:

  • Feathered nonavian theropod dinosaurs are known, but fossil evidence is biased towards small-bodied species preserved in specific fossil lagerstätten.
  • Understanding feather distribution in larger theropod dinosaurs is limited due to preservation biases.

Purpose of the Study:

  • To provide direct evidence of feather presence in the larger-bodied, derived, and flightless theropod dinosaur Velociraptor mongoliensis.
  • To expand knowledge on feather distribution and evolution within nonavian theropod clades.

Main Methods:

  • Examination of the posterior forearm of Velociraptor mongoliensis specimens.
  • Identification of quill knobs, which are indicative of large feather attachment points.

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Main Results:

  • Direct evidence of feathers was found in Velociraptor mongoliensis.
  • Quill knobs were identified on the posterior forearm, indicating the presence of secondary feathers.

Conclusions:

  • This discovery confirms the presence of feathers in a larger, flightless member of a theropod clade.
  • The findings contribute significantly to understanding the evolution and distribution of feathers in nonavian theroprowith dinosaurs.