暴龙超科恐龙的体表显示出巨型化和羽毛进化的矛盾模式。
Tyrannosauroid integument reveals conflicting patterns of gigantism and feather evolution.
作者信息
Bell Phil R, Campione Nicolás E, Persons W Scott, Currie Philip J, Larson Peter L, Tanke Darren H, Bakker Robert T
机构信息
University of New England, Armidale 2351, New South Wales, Australia
Palaeobiology Programme, Department of Earth Sciences, Uppsala University, Villavägen 16, SE 75236 Uppsala, Sweden.
出版信息
Biol Lett. 2017 Jun;13(6). doi: 10.1098/rsbl.2017.0092.
Recent evidence for feathers in theropods has led to speculations that the largest tyrannosaurids, including , were extensively feathered. We describe fossil integument from and other tyrannosaurids ( and ), 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 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.
近期关于兽脚亚目恐龙羽毛的证据引发了一种推测，即包括[具体物种1]在内的最大型暴龙科恐龙全身覆盖着大量羽毛。我们描述了来自[具体物种1]和其他暴龙科恐龙（[具体物种2]和[具体物种3]）的化石皮肤，证实这些大体型恐龙拥有鳞状、类似爬行动物的皮肤。暴龙超科恐龙的体型演化显示出两次独立的巨型化事件；具体而言，[具体物种1]和暴龙科恐龙的大体型是独立演化而来的。这些新发现表明，在一些早期暴龙超科恐龙身上观察到的广泛羽毛覆盖在阿尔比阶时消失了，阿尔比阶是暴龙科的基部。这种消失与古气候无关，但可能与巨型化的演化有关，尽管还存在其他机制。
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