An Early Cretaceous enantiornithine (Aves) preserving an unlaid egg and probable medullary bone

doi:10.1038/s41467-019-09259-x

	An Early Cretaceous enantiornithine (Aves) preserving an unlaid egg and probable medullary bone
	Bailleul, Alida M.1,2; O'Connor, Jingmai 1,2; Zhang, Shukang 1,2; Li, Zhiheng 1,2; Wang, Qiang1,2,3 ; Lamanna, Matthew C.4; Zhu, Xufeng 1,2,3; Zhou, Zhonghe1,2,3
刊名	NATURE COMMUNICATIONS
	2019-03-20
卷号	10 页码:10
ISSN号	2041-1723
DOI	10.1038/s41467-019-09259-x
通讯作者	Bailleul, Alida M.(alida.bailleul@ivpp.ac.cn)
英文摘要	Understanding non-crown dinosaur reproduction is hindered by a paucity of directly associated adults with reproductive traces. Here we describe a new enantiornithine, Avimaia schweitzerae gen. et sp. nov., from the Lower Cretaceous Xiagou Formation with an unlaid egg two-dimensionally preserved within the abdominothoracic cavity. Ground-sections reveal abnormal eggshell proportions, and multiple eggshell layers best interpreted as a multilayered egg resulting from prolonged oviductal retention. Fragments of the shell membrane and cuticle are both preserved. SEM reveals that the cuticle consists of nanostructures resembling those found in neornithine eggs adapted for infection-prone environments, which are hypothesized to represent the ancestral avian condition. The femur preserves small amounts of probable medullary bone, a tissue found today only in reproductively active female birds. To our knowledge, no other occurrence of Mesozoic medullary bone is associated with indications of reproductive activity, such as a preserved egg, making our identification unique, and strongly supported.
资助项目	National Natural Science Foundation of China[41688103] ; Chinese Academy of Sciences-President's International Fellowship Initiative (CAS-PIFI) program ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB26000000]
WOS关键词	THEROPOD DINOSAUR ; SEXUAL-MATURITY ; GANSU PROVINCE ; EGGSHELL ; EVOLUTION ; GROWTH ; BIRDS ; ORNITHOTHORACES ; PRESERVATION ; REVEALS
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	NATURE PUBLISHING GROUP
WOS记录号	WOS:000461757600004
资助机构	National Natural Science Foundation of China ; Chinese Academy of Sciences-President's International Fellowship Initiative (CAS-PIFI) program ; Strategic Priority Research Program of Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://119.78.100.205/handle/311034/9467]
专题	中国科学院古脊椎动物与古人类研究所
通讯作者	Bailleul, Alida M.
作者单位	1.Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins, 142 Xizhimenwai Dajie, Beijing 100044, Peoples R China 2.CAS Ctr Excellence Life & Paleoenvironm, Beijing 100044, Peoples R China 3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 4.Carnegie Museum Nat Hist, Sect Vertebrate Paleontol, Pittsburgh, PA 15213 USA
推荐引用方式 GB/T 7714	Bailleul, Alida M.,O'Connor, Jingmai,Zhang, Shukang,et al. An Early Cretaceous enantiornithine (Aves) preserving an unlaid egg and probable medullary bone[J]. NATURE COMMUNICATIONS,2019,10:10.
APA	Bailleul, Alida M..,O'Connor, Jingmai.,Zhang, Shukang.,Li, Zhiheng.,Wang, Qiang.,...&Zhou, Zhonghe.(2019).An Early Cretaceous enantiornithine (Aves) preserving an unlaid egg and probable medullary bone.NATURE COMMUNICATIONS,10,10.
MLA	Bailleul, Alida M.,et al."An Early Cretaceous enantiornithine (Aves) preserving an unlaid egg and probable medullary bone".NATURE COMMUNICATIONS 10(2019):10.