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On the purported presence of fossilised collagen fibres in an ichthyosaur and a theropod dinosaur

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Original languageEnglish
Pages (from-to)409–422
Number of pages14
JournalPalaeontology
Volume60
Issue number3
Early online date17 Apr 2017
DOIs
DateAccepted/In press - 3 Mar 2017
DateE-pub ahead of print - 17 Apr 2017
DatePublished (current) - May 2017

Abstract

Since the discovery of exceptionally preserved theropod dinosaurs with soft tissues in China in the 1990s, there has been much debate about the nature of filamentous structures observed in some specimens. Sinosauropteryx was the first non-avian theropod to be described with these structures, and remains one of the most studied examples. Despite a general consensus that the structures represent feathers or feather homologues, a few identify them as degraded collagen fibres derived from the skin. This latter view has been based on observations of low-quality images of Sinosauropteryx, as well as the suggestion that because superficially similar structures are seen in Jurassic ichthyosaurs they cannot represent feathers. Here, we highlight issues with the evidence put forward in support of this view, showing that integumentary structures have been misinterpreted based on sedimentary features and preparation marks, and that these errors have led to incorrect conclusions being drawn about the existence of collagen in Sinosauropteryx and the ichthyosaur Stenopterygius. We find that there is no evidence to support integumentary structures seen in the two taxa as collagen fibres, and confirm that the most parsimonious interpretation of fossilised structures that look like feathers in Sinosauropteryx is that they are indeed the remains of feathers.

    Research areas

  • feathered dinosaurs, Collagen, Theropod, Sinosauropteryx, ichthyosaurs, Jehol

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  • Full-text PDF (accepted author manuscript)

    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Wiley at http://onlinelibrary.wiley.com/doi/10.1111/pala.12292/full. Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 361 KB, PDF document

    Licence: CC BY-NC

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    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Wiley at http://onlinelibrary.wiley.com/doi/10.1111/pala.12292/full. Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 1 MB, PDF document

    Licence: CC BY-NC

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