The Jurassic Yanliao theropods have offered rare glimpses of the early paravian evolution and particularly of bird origins, but, with the exception of the bizarre scansoriopterygids, they have shown similar skeletal and integumentary morphologies. Here we report a distinctive new Yanliao theropod species bearing prominent lacrimal crests, bony ornaments previously known from more basal theropods. It shows longer arm and leg feathers than Anchiornis and tail feathers with asymmetrical vanes forming a tail surface area even larger than that in Archaeopteryx. Nanostructures, interpreted as melanosomes, are morphologically similar to organized, platelet-shaped organelles that produce bright iridescent colours in extant birds. The new species indicates the presence of bony ornaments, feather colour and flight-related features consistent with proposed rapid character evolution and significant diversity in signalling and locomotor strategies near bird origins.

中文翻译：

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具有虹彩羽毛的骨状侏罗纪恐龙突显了巴拉圭早期进化的复杂性。

侏罗纪的Yan鸟兽脚类动物提供了罕见的巴拉圭早期进化特别是鸟类起源的掠影，但除了奇异的鞘翅目外，它们都表现出相似的骨骼和外皮形态。在这里，我们报告了一个独特的新燕科兽脚亚目物种，这些物种带有突出的泪c，以前是从更多的基础兽脚亚目中已知的骨质装饰品。它显示出比Anchiornis更长的手臂和腿部羽毛和带有不对称叶片的尾部羽毛，形成的尾部表面积甚至比始祖鸟更大。被解释为黑素体的纳米结构在形态上类似于有组织的血小板状细胞器，它们在现存的鸟类中产生明亮的虹彩。新物种表明存在骨质装饰品，