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Morphogenetic patterns of the shelf-like protuberance in the late Emsian-early Eifelian polygnathid conodonts
Lu, Jian-Feng (卢建锋)1,2; Koenigshof, Peter3
2019-11-29
Source PublicationLETHAIA
ISSN0024-1164
Pages17
Abstract

The shelf-like protuberance on the outer side of the pit in polygnathid conodonts is a unique and easily recognizable feature usually viewed as taxonomically significant for the biostratigraphically important species Polygnathus serotinus. However, the protuberance is also developed in other late Emsian-early Eifelian polygnathids, which mainly include P. praeinversus, P. vigirei, P. pseudoserotinus and P. linguiformis bultyncki. Although several evolutionary lineages have been proposed to elucidate the phylogenesis of the protuberance, its morphogenesis has been rarely studied. In this study, intraspecific variation of P. linguiformis bultyncki is investigated on the basis of abundant specimens from South China and Germany, and two morphotypes are recognized. Moreover, three morphogenetic patterns of the shelf-like protuberance are proposed. Polygnathus praeinversus and P. pseudoserotinus are assigned to the first morphogenetic pattern, with the protuberance formed as a vestigial outer flank of the asymmetrical basal cavity. The second pattern, which can be applied to P. serotinus and P. vigirei, is characterized by a protuberance that is formed as a shelf-like extension of the pit partially buttressed by platform material in juvenile/immature specimens, and by a well-developed shelf-like extension of the pit on its inner side and a bulge in the platform proper on its outer side in mature specimens. Polygnathus linguiformis bultyncki is characterized by the third morphogenetic pattern. Its protuberance is ontogenetically acquired and though absent in juvenile specimens, in immature and mature specimens it is formed as a bulge in the platform proper fully supported by platform material. This study provides an exemplar for conodont research of other geological periods as growth histology can play an important role in investigating morphological variation of conodonts.

KeywordDevonian shelf-like protuberance morphogenetic pattern intraspecific variation conodont lamellae growth histology
DOI10.1111/let.12361
Language英语
WOS KeywordSECTION GUANGXI
Funding ProjectNational Natural Science Foundation of China[41702009] ; National Natural Science Foundation of China[41530103] ; State Key Laboratory of Palaeobiology and Stratigraphy ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB26000000]
WOS Research AreaPaleontology
WOS SubjectPaleontology
WOS IDWOS:000499333400001
Funding OrganizationNational Natural Science Foundation of China ; State Key Laboratory of Palaeobiology and Stratigraphy ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences
PublisherWILEY
Citation statistics
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/29465
Collection中国科学院南京地质古生物研究所
Corresponding AuthorLu, Jian-Feng (卢建锋)
Affiliation1.Chinese Acad Sci, State Key Lab Palaeobiol & Stratig, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, Nanjing 210008, Jiangsu, Peoples R China
3.Senckenberg Res Inst & Nat Hist Museum, D-60325 Frankfurt, Germany
First Author AffilicationNanjing Institute of Geology and Palaeonotology,CAS
Corresponding Author AffilicationNanjing Institute of Geology and Palaeonotology,CAS
Recommended Citation
GB/T 7714
Lu, Jian-Feng ,Koenigshof, Peter. Morphogenetic patterns of the shelf-like protuberance in the late Emsian-early Eifelian polygnathid conodonts[J]. LETHAIA,2019:17.
APA Lu, Jian-Feng ,&Koenigshof, Peter.(2019).Morphogenetic patterns of the shelf-like protuberance in the late Emsian-early Eifelian polygnathid conodonts.LETHAIA,17.
MLA Lu, Jian-Feng ,et al."Morphogenetic patterns of the shelf-like protuberance in the late Emsian-early Eifelian polygnathid conodonts".LETHAIA (2019):17.
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