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	Tentacular nature of the 'column' of the Cambrian diploblastic Xianguangia sinica
通讯作者	Zhao, Yang(yang.zhao@pim.uzh.ch) ; Cong, Pei-yun(cong@ynu.edu.cn)
	Zhao, Yang1,2,3,4; Hou, Xian-guang2,3; Cong, Pei-yun2,3
	2023
发表期刊	JOURNAL OF SYSTEMATIC PALAEONTOLOGY
ISSN	1477-2019
卷号	21期号:1页码:15
摘要	Unveiling the body architectures of Cambrian problematic fossils would provide novel insights into the radiation of metazoan body plans during the 'Cambrian Explosion' and the ancestral traits of major living animal clades. Xianguangia sinica, from the celebrated Chengjiang biota (similar to 518 Ma), is a typical Cambrian problematicum with disputable body architecture, particularly about its 'column' part. The contradictory interpretations of the 'column' of X. sinica have led to at least three hypotheses regarding its affinity in the diploblastic clade. Here we depict the detailed anatomy of the 'column' based on new, exquisitely preserved material. The 'column' of X. sinica is formed by 18 longsword-shaped tentacle-sheath complexes that can either close or be in a flowering state. There is no partitioned cavity internally when the 'column' is closed, invalidating the homology with the true column of living sea anemones. Each tentacle tapers distally and includes a distal flexible portion at about one-fourth the length of the tentacle. The proximal portion is stiff, bearing a set of paired dark stains, and is enveloped by a single outer sheath. Pinnules carrying a row of large cilia are fringed on both sides along the whole length of the tentacles. The body plan of X. sinica is accordingly revised as consisting of a calyx and 18 unique tentacle-sheath complexes that radially surround the mouth. Our result corroborates previous observations that suggest a close relationship between Xianguangia, Daihua and Dinomischus, all of which are here formally assigned to the family Dinomischidae, a monophyletic clade recovered in our phylogenetic analyses. Xianguangia sinica likely employs cilia-bearing pinnate tentacles for sieving particle matter down to 21 mu m, indicating that its nutrition source is suspended micro-planktonic organisms or other organic matter in the bottom water.
关键词	early Cambrian dinomischiids body plan suspension-feeding Chengjiang biota
DOI	10.1080/14772019.2023.2215787
收录类别	SCI
语种	英语
关键词[WOS]	BRITISH-COLUMBIA ; PLANKTON ; FOSSILS ; CHINA
资助项目	National Natural Science Foundation of China[42202023] ; National Natural Science Foundation of China[42072019] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB26000000] ; Jiangsu Funding Program for Excellent Postdoctoral Talent[2022ZB457] ; UZH Postdoc Grant[FK-22-129] ; YNU-Yunnan Government[202201BF070001-016] ; Universitat Zurich
WOS研究方向	Evolutionary Biology ; Paleontology
WOS类目	Evolutionary Biology ; Paleontology
WOS记录号	WOS:001010774600001
项目资助者	National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Jiangsu Funding Program for Excellent Postdoctoral Talent ; UZH Postdoc Grant ; YNU-Yunnan Government ; Universitat Zurich
出版者	TAYLOR & FRANCIS LTD
文献类型	期刊论文
条目标识符	http://ir.nigpas.ac.cn/handle/332004/42411
专题	中国科学院南京地质古生物研究所
通讯作者	Zhao, Yang; Cong, Pei-yun
作者单位	1.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China 2.Yunnan Univ, Inst Palaeontol, Yunnan Key Lab Palaeobiol, Kunming 650500, Peoples R China 3.Yunnan Univ, Inst Palaeontol, MEC Int Joint Lab Palaeobiol & Palaeoenvironm, Kunming 650500, Peoples R China 4.Univ Zurich, Palaontol Inst & Museum, CH-8006 Zurich, Switzerland
第一作者单位	中国科学院南京地质古生物研究所
通讯作者单位	中国科学院南京地质古生物研究所
推荐引用方式 GB/T 7714	Zhao, Yang,Hou, Xian-guang,Cong, Pei-yun. Tentacular nature of the 'column' of the Cambrian diploblastic Xianguangia sinica[J]. JOURNAL OF SYSTEMATIC PALAEONTOLOGY,2023,21(1):15.
APA	Zhao, Yang,Hou, Xian-guang,&Cong, Pei-yun.(2023).Tentacular nature of the 'column' of the Cambrian diploblastic Xianguangia sinica.JOURNAL OF SYSTEMATIC PALAEONTOLOGY,21(1),15.
MLA	Zhao, Yang,et al."Tentacular nature of the 'column' of the Cambrian diploblastic Xianguangia sinica".JOURNAL OF SYSTEMATIC PALAEONTOLOGY 21.1(2023):15.

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