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Orthrozanclus elongata n. sp and the significance of sclerite-covered taxa for early trochozoan evolution
Zhao, Fangchen (赵方臣)1; Smith, Martin R.2; Yin, Zongjun (殷宗军)1; Zeng, Han (曾晗)1,3; Li, Guoxiang (李国祥)1; Zhu, Maoyan (朱茂炎)1,3
2017-11-24
Source PublicationSCIENTIFIC REPORTS
ISSN2045-2322
Volume7Pages:8
Abstract

Orthrozanclus is a shell-bearing, sclerite covered Cambrian organism of uncertain taxonomic affinity, seemingly representing an intermediate between its fellow problematica Wiwaxia and Halkieria. Attempts to group these slug-like taxa into a single 'halwaxiid' clade nevertheless present structural and evolutionary difficulties. Here we report a new species of Orthrozanclus from the early Cambrian Chengjiang Lagerstatte. The scleritome arrangement and constitution in this material corroborates the link between Orthrozanclus and Halkieria, but not with Wiwaxia-and calls into question its purported relationship with molluscs. Instead, the tripartite construction of the halkieriid scleritome finds a more compelling parallel in the camenellan tommotiids, relatives of the brachiopods and phoronids. Such a phylogenetic position would indicate the presence of a scleritome in the common ancestor of the three major trochozoan lineages, Mollusca, Annelida and Brachiozoa. On this view, the absence of fossil Ediacaran sclerites is evidence against any 'Precambrian prelude' to the explosive diversification of these phyla in the Cambrian, c. 540-530 million years ago.

DOI10.1038/s41598-017-16304-6
Indexed BySCI
Language英语
WOS KeywordStem Group Brachiopod ; Wiwaxia-corrugata Matthew ; Cambrian Burgess Shale ; South-australia ; Articulated Halkieriids ; Shelled Brachiopods ; Molluscan Phylogeny ; North Greenland ; Morphology ; Biomineralization
Funding ProjectChinese Academy of Sciences[XDB18000000] ; Chinese Academy of Sciences[XDB10010101] ; National Natural Science Foundation of China[41472012] ; National Natural Science Foundation of China[41661134048]
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
WOS IDWOS:000416135000031
Funding OrganizationChinese Academy of Sciences ; National Natural Science Foundation of China
PublisherNATURE PUBLISHING GROUP
Citation statistics
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/13905
Collection中国科学院南京地质古生物研究所
中国科学院南京地质古生物研究所
其他
Corresponding AuthorZhao, Fangchen (赵方臣); Smith, Martin R.
Affiliation1.Chinese Acad Sci, State Key Lab Palaeobiol & Stratig, Nanjing Inst Geol & Palaeontol, 39 East Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
2.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England
3.Univ Chinese Acad Sci, Coll Earth Sci, 19 Yuquan Rd, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Zhao, Fangchen ,Smith, Martin R.,Yin, Zongjun ,et al. Orthrozanclus elongata n. sp and the significance of sclerite-covered taxa for early trochozoan evolution[J]. SCIENTIFIC REPORTS,2017,7:8.
APA Zhao, Fangchen ,Smith, Martin R.,Yin, Zongjun ,Zeng, Han ,Li, Guoxiang ,&Zhu, Maoyan .(2017).Orthrozanclus elongata n. sp and the significance of sclerite-covered taxa for early trochozoan evolution.SCIENTIFIC REPORTS,7,8.
MLA Zhao, Fangchen ,et al."Orthrozanclus elongata n. sp and the significance of sclerite-covered taxa for early trochozoan evolution".SCIENTIFIC REPORTS 7(2017):8.
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