Abstract:
: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.
journal_name
Biol Lettjournal_title
Biology lettersauthors
Bell PR,Campione NE,Persons WS 4th,Currie PJ,Larson PL,Tanke DH,Bakker RTdoi
10.1098/rsbl.2017.0092subject
Has Abstractpub_date
2017-06-01 00:00:00issue
6eissn
1744-9561issn
1744-957Xpii
rsbl.2017.0092journal_volume
13pub_type
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