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

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On the purported presence of fossilised collagen fibres in an ichthyosaur and a theropod dinosaur. / Smithwick, Fiann; Mayr, Gerald; Saitta, Evan; Benton, Michael; Vinther, Jakob.

In: Palaeontology, Vol. 60, No. 3, 05.2017, p. 409–422.

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Smithwick, Fiann ; Mayr, Gerald ; Saitta, Evan ; Benton, Michael ; Vinther, Jakob. / On the purported presence of fossilised collagen fibres in an ichthyosaur and a theropod dinosaur. In: Palaeontology. 2017 ; Vol. 60, No. 3. pp. 409–422.

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@article{424409797476414b86840f960537101b,
title = "On the purported presence of fossilised collagen fibres in an ichthyosaur and a theropod dinosaur",
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.",
keywords = "feathered dinosaurs, Collagen, Theropod, Sinosauropteryx, ichthyosaurs, Jehol",
author = "Fiann Smithwick and Gerald Mayr and Evan Saitta and Michael Benton and Jakob Vinther",
year = "2017",
month = "5",
doi = "10.1111/pala.12292",
language = "English",
volume = "60",
pages = "409–422",
journal = "Palaeontology",
issn = "0031-0239",
publisher = "Wiley",
number = "3",

}

RIS - suitable for import to EndNote

TY - JOUR

T1 - On the purported presence of fossilised collagen fibres in an ichthyosaur and a theropod dinosaur

AU - Smithwick, Fiann

AU - Mayr, Gerald

AU - Saitta, Evan

AU - Benton, Michael

AU - Vinther, Jakob

PY - 2017/5

Y1 - 2017/5

N2 - 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.

AB - 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.

KW - feathered dinosaurs

KW - Collagen

KW - Theropod

KW - Sinosauropteryx

KW - ichthyosaurs

KW - Jehol

U2 - 10.1111/pala.12292

DO - 10.1111/pala.12292

M3 - Article

VL - 60

SP - 409

EP - 422

JO - Palaeontology

JF - Palaeontology

SN - 0031-0239

IS - 3

ER -