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The Feathers of the Jurassic Urvogel Archaeopteryx

  • Nicholas R. LongrichEmail author
  • Helmut Tischlinger
  • Christian Foth
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Part of the Fascinating Life Sciences book series (FLS)

Abstract

The Jurassic stem bird Archaeopteryx is an iconic transitional fossil, with an intermediate morphology combining features of non-avian dinosaurs and crown Aves. Importantly, fossils of Archaeopteryx preserve not only the bones but also details of the plumage and therefore help shed light on the evolution of feathers, wings, and avian flight. Plumage is preserved in multiple individuals, allowing a detailed documentation of the feathers of the wings, tail, hindlimbs, and body. In some features, Archaeopteryx’ plumage is remarkably modern, yet in others, it is strikingly primitive. As in extant birds, remiges and coverts are enlarged and overlap to form airfoils. Remiges and rectrices exhibit asymmetrical, pennaceous vanes, with interlocking barbules. The hindlimbs bear large, vaned feathers as in Microraptor and Anchiornis. Rectrices are numerous and extend the full length of the tail to the hips. The plumage of crown Aves was assembled in a stepwise fashion from Anchiornis through Archaeopteryx, culminating in a modern arrangement in ornithothoracines. Subsequent stasis in feather and wing morphology likely reflects aerodynamic and developmental constraints. Feather morphology and arrangement in Archaeopteryx are consistent with lift-generating function, and the wing loading and aspect ratio are comparable to modern birds, consistent with gliding and perhaps flapping flight. The plumage of Archaeopteryx is intermediate between Anchiornis and more derived Pygostylia, suggesting a degree of flight ability intermediate between the two.

Notes

Acknowledgements

We are indebted to the curators and staff of the Natural History Museum (London), Humboldt Museum für Naturkunde (Berlin), Jura-Museum (Eichstätt), and Wyoming Dinosaur Center (Thermopolis), especially Raimund Albersdörfer, Martina Köbl-Ebert, Daniela Schwarz, and Burkhard Pohl for access to the specimens in their care, without which this study would not be possible. NRL is grateful to Tony Russell for his patience as a supervisor and mentor and many discussions and also to Philip J. Currie for the discussions. We further thank Jakob Vinther, Oliver Rauhut, and Xu Xing for the discussion and Tom Holtz for his comments on the manuscript. CF is supported by the Swiss National Science Foundation under grant PZ00P2_174040.

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Copyright information

© Springer Nature Switzerland AG 2020

Authors and Affiliations

  • Nicholas R. Longrich
    • 1
    Email author
  • Helmut Tischlinger
    • 2
  • Christian Foth
    • 3
  1. 1.Department of Biology and BiochemistryThe Milner Centre for Evolution, University of BathBathUK
  2. 2.StammhamGermany
  3. 3.Departement für GeowissenschaftenUniversität FreiburgFreiburgSwitzerland

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