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Synchrotron-aided reconstruction of the prioniodinin multielement conodont apparatus (Hadrodontina) from the Lower Triassic of China
Sun, Zuoyu1,2,3; Liu, Shuang1,2,3; Ji, Cheng4,5; Jiang, Dayong1,2; Zhou, Min1,2
2020-12-15
Source PublicationPALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN0031-0182
Volume560Pages:11
Abstract

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 P-1 and P-2, breviform digyrate M, triramous S-0, extensiform digyrate S-1 and S-2, and bipennate S-3/4 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 S-1 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 S-0 element, and in rostro-caudal order the paired M elements are located between S-0 and S1-4 elements and then the S1-4 elements are successively abaxially flanked the posterior process of the S-0 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 S-1 and S-2 elements having reverse motions of sub-helicoidal 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.

KeywordNatural assemblage 15-element apparatus Synchrotron X-ray microtomography Smithian Helongshan Formation
DOI10.1016/j.palaeo.2020.109913
Indexed BySCI
Language英语
WOS KeywordUPPER ORDOVICIAN ; NATURAL ASSEMBLAGES ; ANHUI PROVINCE ; ARCHITECTURE ; ELEMENT ; HOMOLOGIES ; SEQUENCE ; CHAOHU ; TISSUE ; JAPAN
Funding ProjectNational Natural Science Foundation of China[41920104001] ; National Natural Science Foundation of China[41876124] ; National Natural Science Foundation of China[41572008] ; National Natural Science Foundation of China[41972003] ; Strategic Priority Research Program of the Chinese Academy of Science[XDA14010404] ; Strategic Priority Research Program of the Chinese Academy of Science[XDB26000000] ; Ministry of Science and Technology[2016YFC0503301] ; State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, CAS)[123107] ; State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, CAS)[143108] ; State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, CAS)[173123] ; State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, CAS)[20182107] ; China Geological Survey[121201102000150012-09]
WOS Research AreaPhysical Geography ; Geology ; Paleontology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS IDWOS:000591245000002
Funding OrganizationNational Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Science ; Ministry of Science and Technology ; State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, CAS) ; China Geological Survey
PublisherELSEVIER
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/37623
Collection中国科学院南京地质古生物研究所
Corresponding AuthorSun, Zuoyu
Affiliation1.Peking Univ, Lab Orogen Belt & Crustal Evolut, Minist Educ, Dept Geol, Yiheyuan St 5, Beijing 100871, Peoples R China
2.Peking Univ, Geol Museum, Yiheyuan St 5, Beijing 100871, Peoples R China
3.Shandong Univ Sci & Technol, Coll Earth Sci & Engn, Qingdao 266590, Shandong, Peoples R China
4.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, 39 East Beijing Rd, Nanjing 210008, Peoples R China
5.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, 39 East Beijing Rd, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Sun, Zuoyu,Liu, Shuang,Ji, Cheng,et al. Synchrotron-aided reconstruction of the prioniodinin multielement conodont apparatus (Hadrodontina) from the Lower Triassic of China[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2020,560:11.
APA Sun, Zuoyu,Liu, Shuang,Ji, Cheng,Jiang, Dayong,&Zhou, Min.(2020).Synchrotron-aided reconstruction of the prioniodinin multielement conodont apparatus (Hadrodontina) from the Lower Triassic of China.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,560,11.
MLA Sun, Zuoyu,et al."Synchrotron-aided reconstruction of the prioniodinin multielement conodont apparatus (Hadrodontina) from the Lower Triassic of China".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 560(2020):11.
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