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Tyrannosauroid integument reveals conflicting patterns of gigantism and feather evolution
Univ New England, Armidale, NSW 2351, Australia..
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
Univ Alberta, Edmonton, AB T6E 4S6, Canada..
Univ Alberta, Edmonton, AB T6E 4S6, Canada..
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2017 (English)In: Biology Letters, ISSN 1744-9561, E-ISSN 1744-957X, Vol. 13, no 6, 20170092Article in journal (Refereed) Published
Abstract [en]

Recent evidence for feathers in theropods has led to speculations that the largest tyrannosaurids, including Tyrannosaurus rex, were extensively feathered. We describe fossil integument from Tyrannosaurus and other tyrannosaurids (Albertosaurus, Daspletosaurus, Gorgosaurus and Tarbosaurus), confirming that these large-bodied forms possessed scaly, reptilian-like skin. Body size evolution in tyrannosauroids reveals two independent occurrences of gigantism; specifically, the large sizes in Yutyrannus and tyrannosaurids were independently derived. These new findings demonstrate that extensive feather coverings observed in some early tyrannosauroids were lost by the Albian, basal to Tyrannosauridae. This loss is unrelated to palaeoclimate but possibly tied to the evolution of gigantism, although other mechanisms exist.

Place, publisher, year, edition, pages
ROYAL SOC , 2017. Vol. 13, no 6, 20170092
Keyword [en]
Tyrannosauridae, skin, feathers, gigantism
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-333410DOI: 10.1098/rsbl.2017.0092ISI: 000406896100009OAI: oai:DiVA.org:uu-333410DiVA: diva2:1157073
Available from: 2017-11-15 Created: 2017-11-15 Last updated: 2017-11-15Bibliographically approved

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