Variations of Mesozoic feathers: Insights from the morphogenesis of extant feather rachises

Shuo Wang, Wei Ling Chang, Qiyue Zhang, Menglu Ma, Feng Yang, De Zhuo, Harn I.Chen Hans, Rui Yang, Ping Wu, Michael Habib, Wen Tau Juan, Cheng Ming Chuong

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1 引文 斯高帕斯(Scopus)

摘要

The rachises of extant feathers, composed of dense cortex and spongy internal medulla, are flexible and light, yet stiff enough to withstand the load required for flight, among other functions. Incomplete knowledge of early feathers prevents a full understanding of how cylindrical rachises have evolved. Bizarre feathers with unusually wide and flattened rachises, known as “rachis-dominated feathers” (RDFs), have been observed in fossil nonavian and avian theropods. Newly discovered RDFs embedded in early Late Cretaceous Burmese ambers (about 99 million year ago) suggest the unusually wide and flattened rachises mainly consist of a dorsal cortex, lacking a medulla and a ventral cortex. Coupled with findings on extant feather morphogenesis, known fossil RDFs were categorized into three morphotypes based on their rachidial configurations. For each morphotype, potential developmental scenarios were depicted by referring to the rachidial development in chickens, and relative stiffness of each morphotype was estimated through functional simulations. The results suggest rachises of RDFs are developmentally equivalent to a variety of immature stages of cylindrical rachises. Similar rachidial morphotypes documented in extant penguins suggest that the RDFs are not unique to Mesozoic theropods, although they are likely to have evolved independently in extant penguins.
原文英語
頁(從 - 到)2121-2133
頁數13
期刊Evolution
74
發行號9
DOIs
出版狀態已發佈 - 9月 1 2020

ASJC Scopus subject areas

  • 生態學、進化論、行為學與系統學
  • 遺傳學
  • 農業與生物科學 (全部)

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