气候变化领域集成服务门户(CCPortal): Synchrotron-aided reconstruction of the prioniodinin multielement conodont apparatus (Hadrodontina) from the Lower Triassic of China

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DOI	10.1016/j.palaeo.2020.109913
	Synchrotron-aided reconstruction of the prioniodinin multielement conodont apparatus (Hadrodontina) from the Lower Triassic of China
	Sun Z.; Liu S.; Ji C.; Jiang D.; Zhou M.
发表日期	2020
ISSN	0031-0182
卷号	560
英文摘要	Although natural assemblages that preserve natural associations of elements in conodont apparatus are extremely rare, they are of fundamental importance in conodont paleobiology, e.g. apparatus architecture, functional morphology, suprageneric classification and evolution. We herein report three exceptionally preserved natural assemblages from the uppermost Helongshan Formation of South Majiashan section, Chaohu City of Anhui Province, China. They were scanned using synchrotron X-ray microtomography and the three-dimensional apparatus of the end-Smithian (Olenekian, Early Triassic) Hadrodontina aequabilis was reconstructed. Our result confirms that the prioniodinin Hadrodontina has a septimembrate apparatus composed of 15 elements (angulate P1 and P2, breviform digyrate M, triramous S0, extensiform digyrate S1 and S2, and bipennate S3/4 elements). Within prioniodinin apparatuses that were reconstructed based on conodont natural assemblages, Hadrodontina shares more features with those of Hibbardella (Late Devonian) and Ellisonia (end-Permian), but differs in its angulate P 2 element having no distinct cusp and twisting distally, and its extensiform digyrate S1 having an inwardly bending short anterior lateral process. Element positions of the Hadrodontina apparatus near to closure are revealed, where at the front lies an axial S0 element, and in rostro-caudal order the paired M elements are located between S0 and S1–4 elements and then the S1–4 elements are successively abaxially flanked the posterior process of the S0 element. Geometric analysis demonstrated that the relative motions of the elements in Hadrodontina apparatus most probably conform to those of “single pulley hypothesis” previously proposed, but mainly differs in its extensiform digyrate S1 and S2 elements having reverse motions of subhelicoidal trajectories to channel food toward the pharynx. Thus, the Hadrodontina apparatus is among the most completely characterized conodonts and serves as a template for prioniodinin multielement reconstruction. This study provides significant information on dynamic reconstruction and the phylogeny of the conodont apparatuses within the Prioniodinina. © 2020 Elsevier B.V.
英文关键词	15-element apparatus; Helongshan Formation; Natural assemblage; Smithian; Synchrotron X-ray microtomography
语种	英语
scopus关键词	conodont; phylogeny; reconstruction; synchrony; three-dimensional modeling; Triassic; Anhui; Chaohu; China
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150284
作者单位	Laboratory of Orogenic Belt and Crustal Evolution, Ministry of Education, Department of Geology and Geological Museum, Peking University, Yiheyuan Street 5, Beijing, 100871, China; College of Earth Science and Engineering, Shandong University of Science and Technology, Shandong, 266590, China; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing, 210008, China
推荐引用方式 GB/T 7714	Sun Z.,Liu S.,Ji C.,et al. Synchrotron-aided reconstruction of the prioniodinin multielement conodont apparatus (Hadrodontina) from the Lower Triassic of China[J],2020,560.
APA	Sun Z.,Liu S.,Ji C.,Jiang D.,&Zhou M..(2020).Synchrotron-aided reconstruction of the prioniodinin multielement conodont apparatus (Hadrodontina) from the Lower Triassic of China.Palaeogeography, Palaeoclimatology, Palaeoecology,560.
MLA	Sun Z.,et al."Synchrotron-aided reconstruction of the prioniodinin multielement conodont apparatus (Hadrodontina) from the Lower Triassic of China".Palaeogeography, Palaeoclimatology, Palaeoecology 560(2020).