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Fossilized reproductive modes reveal a protistan affinity of Chitinozoa
Liang, Yan(梁艳)1,2; Hints, Olle3; Tang, Peng(唐鹏)1,2; Cai, Chenyang(蔡晨阳)1,2; Goldman, Daniel4; Nolvak, Jaak3; Tihelka, Erik5; Pang, Ke(庞科)1,2; Bernardo, Joseph6; Wang, Wenhui7
2020-12-01
Source PublicationGEOLOGY
ISSN0091-7613
Volume48Issue:12Pages:1200-1204
Abstract

Reproduction is a key aspect of evolution, but the process is rarely preserved in the fossil record. Organisms fortuitously preserved undergoing reproduction provide an exceptional window illuminating the biology of extinct taxa, especially those with unknown phylogenetic position. Here we report exceptional specimens of chitinozoans (enigmatic Paleozoic organic-walled microfossils) preserved as "test-in-test" morphology, which have previously been interpreted as teratological forms. Application of advanced imaging techniques on newly recovered and reexamined Ordovician materials enabled documentation of critical morphological details of the test's inner ultrastructure for the first time. The results show that the newly observed spongy material and dendritic structure on or inside the chitinozoan test as well as the test wall itself are all made of clustered rounded spherical particles. Morphological details suggest that those specimens represent key stages of new asexual reproductive strategies, hitherto undescribed, which produce either one or several offspring at a time. This observation challenges the prevailing hypothesis that chitinozoans are eggs of cryptic extinct marine metazoans. Instead, it is more plausible that they represent a new isolated group of protists.

DOI10.1130/G47865.1
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[41972015] ; National Natural Science Foundation of China[41772001] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB26000000] ; Estonian Research Council[PRG836] ; International Geoscience Programme[653]
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000594355000015
Funding OrganizationNational Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Estonian Research Council ; International Geoscience Programme
PublisherGEOLOGICAL SOC AMER, INC
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/37611
Collection中国科学院南京地质古生物研究所
Corresponding AuthorLiang, Yan(梁艳); Wang, Wenhui
Affiliation1.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, Nanjing 210008, Peoples R China
3.Tallinn Univ Technol, Dept Geol, EE-19086 Tallinn, Estonia
4.Univ Dayton, Dept Geol, Dayton, OH 45469 USA
5.Hartpury Coll, Dept Anim Sci, Hartpury GL19 3BE, England
6.Texas A&M Univ, Dept Biol, College Stn, TX 77843 USA
7.Cent South Univ, Sch Geosci & Infophys, Key Lab Metallogen Predict Nonferrous Met & Geol, Changsha 410083, 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
Liang, Yan,Hints, Olle,Tang, Peng,et al. Fossilized reproductive modes reveal a protistan affinity of Chitinozoa[J]. GEOLOGY,2020,48(12):1200-1204.
APA Liang, Yan.,Hints, Olle.,Tang, Peng.,Cai, Chenyang.,Goldman, Daniel.,...&Wang, Wenhui.(2020).Fossilized reproductive modes reveal a protistan affinity of Chitinozoa.GEOLOGY,48(12),1200-1204.
MLA Liang, Yan,et al."Fossilized reproductive modes reveal a protistan affinity of Chitinozoa".GEOLOGY 48.12(2020):1200-1204.
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