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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >A New Feather Type In A Nonavian Theropod And The Early Evolution Of Feathers
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A New Feather Type In A Nonavian Theropod And The Early Evolution Of Feathers

机译：nonavian节肢动物中一种新的羽毛类型和羽毛的早期演变

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摘要

All described feathers in nonavian theropods are composite structures formed by multiple filaments. They closely resemble relatively advanced stages predicted by developmental models of the origin of feathers, but not the earliest stage. Here, we report a feather type in two specimens of the basal therizinosaur Beipiao-saurus. in which each individual feather is represented by a single broad filament. This morphotype is congruent with the stage I morphology predicted by developmental models, and all major predicted morphotypes have now been documented in the fossil record. This congruence between the full range of paleontological and developmental data strongly supports the hypothesis that feathers evolved and initially diversified in nonavian theropods before the origin of birds and the evolution of flight.
机译：在非禽类兽脚亚目中所有描述的羽毛都是由多根细丝形成的复合结构。它们与羽毛起源的发育模型预测的相对较高级的阶段非常相似，但不是最早的阶段。在这里，我们报告了两个基底龙鼻龙贝类标本的羽毛类型。其中每个单独的羽毛都由一条细丝表示。这种形态型与发育模型预测的I期形态是一致的，并且所有主要的预测形态型现在都已记录在化石记录中。整个古生物学和发育数据之间的一致性完全支持了以下假设：在鸟类起源和飞行进化之前，羽毛在非鸟类兽脚类动物中进化并最初是多样化的。

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