A new ootype of putative dromaeosaurid eggs from the Upper Cretaceous of southern China

IF 1.9 3区 地球科学 Q1 GEOLOGY
Rui Wu , Kecheng Niu , Shukang Zhang , Yu Xue , Fenglu Han
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引用次数: 0

Abstract

Non-avian maniraptoran eggs are abundant in the Upper Cretaceous of China. Previous studies mainly focused on oviraptorosaur and troodontid eggs which can be classified into the oofamilies Elongatoolithidae and Prismatoolithidae, respectively. Here we report a new possible ootype of dromaeosaurid dinosaur recovered from the Lianhe Formation of the Ganzhou Basin. The new ootaxon, Gannanoolithus yingliangi oogen. et oosp. nov., is remarkable for its symmetrically elliptic shape and two structural layers with an abrupt and straight boundary. It shares a similar elongated shape, interlocked eggshell units, and an angusticanaliculate pore system with those of Deinonychus eggshell-like maniraptoran ootaxa reported from North America, Europe, and East Asia. The new phylogenetic analysis suggests the monophyly of dromaeosaurid and oviraptorosaurian eggs, and troodontid eggs are closely related to bird eggs. Paired eggs of Gannanoolithus might indicate that dromaeosaurid dinosaurs also have paired functional oviducts like oviraptorosaurs and troodontids. In addition, the porosity and EBSD analyses support that these eggs in the mound nests are buried.

中国南方上白垩世的一种新的推定单齿龙蛋原型
中国上白垩统中有大量的非鸟类迅猛龙蛋。以往的研究主要集中在椭圆龙科(oviraptorosaur)和三角龙科(troodontid)的恐龙蛋,它们分别被归入椭圆龙科(Elongatoolithidae)和三角龙科(Prismatoolithidae)。在此,我们报告了从赣州盆地涟河地层中发现的一种新的可能的恐龙蛋型。这一新的原型--颖梁龙(Gannanoolithus yingliangi oogen.它与北美、欧洲和东亚报道的Deinonychus蛋壳类猛禽卵壳类具有相似的拉长形状、相互交错的蛋壳单元和angusticanaliculate孔隙系统。新的系统发育分析表明,地龙类和卵翼龙类的蛋是单系的,而特罗多龙类的蛋与鸟蛋关系密切。赣南龙的成对卵可能表明,单龙类恐龙也像卵龙类和特龙类一样具有成对的功能性输卵管。此外,孔隙率和EBSD分析也证明了土墩巢中的这些蛋是埋藏的。
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来源期刊
Cretaceous Research
Cretaceous Research 地学-地质学
CiteScore
4.10
自引率
19.00%
发文量
235
审稿时长
12 weeks
期刊介绍: Cretaceous Research provides a forum for the rapid publication of research on all aspects of the Cretaceous Period, including its boundaries with the Jurassic and Palaeogene. Authoritative papers reporting detailed investigations of Cretaceous stratigraphy and palaeontology, studies of regional geology, and reviews of recently published books are complemented by short communications of significant new findings. Papers submitted to Cretaceous Research should place the research in a broad context, with emphasis placed towards our better understanding of the Cretaceous, that are therefore of interest to the diverse, international readership of the journal. Full length papers that focus solely on a local theme or area will not be accepted for publication; authors of short communications are encouraged to discuss how their findings are of relevance to the Cretaceous on a broad scale. Research Areas include: • Regional geology • Stratigraphy and palaeontology • Palaeobiology • Palaeobiogeography • Palaeoceanography • Palaeoclimatology • Evolutionary Palaeoecology • Geochronology • Global events.
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