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中國早白堊世韓氏周鳥(渤海鳥科)亞成體的解剖學新信息

發布時間:2015年03月13日  作者:張玉光等

  :反鳥類在白堊紀鳥類進化上出現了多樣的進化分支,然而發生在這些進化分支上生態作用的形態學特化認識一直以來并不深刻。本文報道發現在中國東北地區熱河生物群保存精美的早白堊世鳥類標本,指(趾)爪的形態學表明反鳥類發生過較為獨特的生態特化,新的標本在形態學上具有韓氏周鳥正型標本無法形態學比較識別的特征,盡管后者有點大。

新的韓氏周鳥標本在頭骨上提供了前所未知的重要信息,將進一步對所知的一些反鳥類顱骨解剖和演化的特征進行全面補充,同時也增進了我們對于韓氏周鳥頭后骨骼最近公認的演化特征的認識,這件標本成為認識韓氏周鳥最為完整的反鳥類標本之一,必將會促進下一步的深入研究。

New information on the anatomy of the Chinese Early Cretaceous Bohaiornithidae (Aves: Enantiornithes) from a subadult specimen of Zhouornis hani

Zhang Yuguang et al.

AbstractEnantiornithines are the most diverse avian clade in the Cretaceous. However, morphological specializations indicative of specific ecological roles are not well known for this clade. Here we report on an exquisitely well-preserved specimen from the Lower Cretaceous Jehol Group of northeastern China, which pedal morphology is suggestive of a unique ecological specialization within Enantiornithes. The morphology of the new specimen is largely indistinguishable from that of the holotype of the bohaiornithid enantiornithine Zhouornis hani, albeit the latter is somewhat larger.The new specimen provides important and previously unknown details of the skull of Zhouornis hani, which add to the limited knowledge about the cranial anatomy and evolution of  enantiornithines. The information offered by the new specimen also augments our understanding of the postcranial morphology of bohaiornithid enantiornithines, a clade that has been only recently recognized.With the description of this specimen, Zhouornis hani becomes one of the most anatomically complete known enantiornithine species, which will facilitate future  morphological studies.

From Zhang Yuguang et al. 2014, PeerJ 2:e407; DOI 10.7717/peerj.1-19

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