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Nature communications v.9 no.1, 2018년, pp.2072 - 2072   SCI SCIE
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Fossilized skin reveals coevolution with feathers and metabolism in feathered dinosaurs and early birds

McNamara, Maria E. (School of Biological, Earth and Environmental Sciences, University College Cork, North Mall, Cork, T23 TK30, Ireland. maria.mcnamara@ucc.ie ) ; Zhang, Fucheng (Institute of Geology and Paleontology, Linyi University, Shuangling Road, Linyi City, Shandong, 276005, China. zhangfucheng@lyu.edu.cn ) ; Kearns, Stuart L. (School of Earth Sciences, University of Bristol, Queen's Road, Bristol, BS8 1RJ, UK ) ; Orr, Patrick J. (UCD School of Earth Sciences, University College Dublin, Dublin, D04 N2E5, Ireland ) ; Toulouse, André (Department of Anatomy and Neuroscience, University College Cork, Western Road, Cork, T12 XF62, Ireland ) ; Foley, Tara (Department of Anatomy and Neuroscience, University College Cork, Western Road, Cork, T12 XF62, Ireland ) ; Hone, David W. E. (School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Rd., London, E1 4NS, UK ) ; Rogers, Chris S. (School of Biological, Earth and Environmental Sciences, University College Cork, North Mall, Cork, T23 TK30, Ireland ) ; Benton, Michael J. (School of Earth Sciences, University of Bristol, Queen's Road, Bristol, BS8 1RJ, UK ) ; Johnson, Diane (School of Physical ) ; Xu, Xing ; Zhou, Zhonghe ;
  • 초록  

    Feathers are remarkable evolutionary innovations that are associated with complex adaptations of the skin in modern birds. Fossilised feathers in non-avian dinosaurs and basal birds provide insights into feather evolution, but how associated integumentary adaptations evolved is unclear. Here we report the discovery of fossil skin, preserved with remarkable nanoscale fidelity, in three non-avian maniraptoran dinosaurs and a basal bird from the Cretaceous Jehol biota (China). The skin comprises patches of desquamating epidermal corneocytes that preserve a cytoskeletal array of helically coiled α-keratin tonofibrils. This structure confirms that basal birds and non-avian dinosaurs shed small epidermal flakes as in modern mammals and birds, but structural differences imply that these Cretaceous taxa had lower body heat production than modern birds. Feathered epidermis acquired many, but not all, anatomically modern attributes close to the base of the Maniraptora by the Middle Jurassic.


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