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Early Cambrian animal diapause embryos revealed by X-ray tomography
Yin, Zongjun (殷宗军)1,2; Zhao, Duoduo (赵多多)1; Pan, Bing (潘兵)1; Zhao, Fangchen (赵方臣)1,2; Zeng, Han (曾晗)1; Li, Guoxiang (李国祥)1,2; Bottjer, David J.3; Zhu, Maoyan (朱茂炎)1,2,4
2018-05-01
Source PublicationGEOLOGY
ISSN0091-7613
Volume46Issue:5Pages:387-390
Abstract

Discoveries of animal embryos have profoundly improved our understanding of the early evolution of animal development. However, the fossil record of early animal embryos is extremely sparse. Here we present some three-dimensionally (3-D) phosphatized Archaeooides from the basal Cambrian in southern Shaanxi Province, China. The 3-D reconstructions of a number of specimens, aided by high-resolution X-ray tomography, demonstrate that these soft-bodied fossil organisms have a thick cyst characterized by pustule-like ornaments and vesicular structures. Furthermore, a multicellular inner body undergoing palintomic cell division is enclosed by the cyst. The suite of characters, including submillimeter to millimeter scale, a palintomic pattern of cell division, and a complex cyst wall microstructure, corroborate the hypothesis that Archaeooides fossils represent the embryonic remains of animals. More specifically, the structure of the cyst wall bears close comparison to the resting cysts of living invertebrates, allowing us to interpret Archaeooides as a diapause embryonic stage adapted to the temporally and spatially heterogeneous redox conditions that extended from the Ediacaran to the early Cambrian. The global distribution of Archaeooides indicates that these conditions were geographically widespread. Ultimately, Archaeooides provides evidence of the early evolution of this metazoan life history strategy as an adaptation to adverse environmental conditions. Its widespread occurrence in both conventional and exceptional taphonomic windows provides the potential for reconstructing its embryology and, by inference, the developmental evolution of early animals and their body plans.

DOI10.1130/G40081.1
Language英语
WOS KeywordResting Eggs ; China ; Identification ; Branchiopoda ; Microfossils ; Anostraca ; Fossils ; Nuclei ; Wengan ; Middle
Funding ProjectChinese Academy of Sciences (CAS)[XDB18000000] ; Chinese Academy of Sciences (CAS)[10010101] ; National Natural Science Foundation of China, Youth Innovation Promotion Association of the CAS
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000431359800004
Funding OrganizationChinese Academy of Sciences (CAS) ; National Natural Science Foundation of China, Youth Innovation Promotion Association of the CAS
PublisherGEOLOGICAL SOC AMER, INC
Citation statistics
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/18712
Collection中国科学院南京地质古生物研究所
其他
Corresponding AuthorYin, Zongjun (殷宗军)
Affiliation1.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, Nanjing 210008, Jiangsu, Peoples R China
3.Univ Southern Calif, Dept Earth Sci, Los Angeles, CA 90089 USA
4.Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China
First Author AffilicationNanjing Institute of Geology and Palaeonotology,CAS
Corresponding Author AffilicationNanjing Institute of Geology and Palaeonotology,CAS
Recommended Citation
GB/T 7714
Yin, Zongjun ,Zhao, Duoduo ,Pan, Bing ,et al. Early Cambrian animal diapause embryos revealed by X-ray tomography[J]. GEOLOGY,2018,46(5):387-390.
APA Yin, Zongjun .,Zhao, Duoduo .,Pan, Bing .,Zhao, Fangchen .,Zeng, Han .,...&Zhu, Maoyan .(2018).Early Cambrian animal diapause embryos revealed by X-ray tomography.GEOLOGY,46(5),387-390.
MLA Yin, Zongjun ,et al."Early Cambrian animal diapause embryos revealed by X-ray tomography".GEOLOGY 46.5(2018):387-390.
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