Supplementary material from "Tyrannosauroid integument reveals conflicting patterns of gigantism and feather evolution"
Version 2 2017-06-05, 12:45
Version 1 2017-05-25, 09:10
Posted on 2017-06-05 - 12:45
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.
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R. Bell, Phil; E. Campione, Nicolás; Persons, W. Scott; J. Currie, Philip; L. Larson, Peter; H. Tanke, Darren; et al. (2017). Supplementary material from "Tyrannosauroid integument reveals conflicting patterns of gigantism and feather evolution". The Royal Society. Collection. https://doi.org/10.6084/m9.figshare.c.3787391.v2
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AUTHORS (7)
PR
Phil R. Bell
NE
Nicolás E. Campione
WP
W. Scott Persons
PJ
Philip J. Currie
PL
Peter L. Larson
DH
Darren H. Tanke
RB
Robert T. Bakker