报告人：杨子睿
       报告题目: The reproductive biology of Cretaceous oviraptorid dinosaurs and its implication for the origin of bird reproduction
　　合作导师：徐星
　　评审委员会主席：周忠和
　　委员：徐星、汪筱林、刘俊、邹晶梅
　　时间：2019年2月22日（星期五）下午3:00
　　地点：南楼321室　
       内容简介：This research pioneers an integrative approach that includes all lines of evidence to comprehensively and in detail reconstruct the reproductive biology of oviraptorid dinosaurs. Oviraptorid dinosaurs are a distinctive group of feathered maniraptoran dinosaurs from the Late Cretaceous and are characterized by their toothless, parrot-like beaks. Oviraptorid dinosaurs left a superb record of skeletal fossils, clutches, and eggs that inform on their reproductive biology. For instance, the association of an oviraptorid adult “sitting” on a clutch that is represented by several Mongolian and Chinese fossils was interpreted as brooding behavior, a parental care mode only present in modern birds. Despite controversies over this interpretation, these amazing fossils led to the current view that the biology of these near-bird dinosaurs can be inferred from that of modern birds. However, evidence from chemical, taphonomic, and ecological approaches presented in this research reveals a unique reproductive biology in oviraptorid dinosaurs that differs from modern birds in egg structure, clutch architecture and nesting mode, and from less derived dinosaurs and crocodiles in hatching mode and parental investment. Such a unique reproductive mode lacking any modern analogs is contrary to the current view that the nesting biology of these near-bird dinosaurs is analogous to that of modern birds since they are closely related. The applicant will carry out further studies on detection of odor molecules preserved in fossil eggshells, which informs on dinosaur hatching strategies and sheds lights on dinosaur reproduction biology.

       窃蛋龙是一类在晚白垩世生活的，独特的带羽毛的手盗龙类恐龙，它们具有类似鹦鹉的无牙的嘴喙。窃蛋龙类保存了大量的骨骼丶蛋窝和蛋的化石，纪录了许多生殖生物学方面的信息。比如，在中国和蒙古发现了一些窃蛋龙成体“坐在“蛋窝上的化石，被认为是恐龙孵蛋行为的证据，而此前只在现生鸟类中发现这种行为。作者尝试使用多方证据来综合研究窃蛋龙的生殖生物学，揭示了窃蛋龙在蛋壳和蛋窝结构，以及筑巢行为上的独特之处。这些特点与现代鸟类丶较为原始的恐龙及鳄类都截然不同，挑战了过去普遍认为的，现生生物行为能直接套用到恐龙的观点。进站後将尝试研究蛋壳化石中保存的气味分子，以了解恐龙的孵化策略与生殖生物学。
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                                                                       研究生部
　　                                                          2019年2月19日