Species of the medullosan ovule Stephanospermum from the Lopingian (late Permian) floras of China

doi:10.1016/j.jseaes.2013.07.030

	Species of the medullosan ovule Stephanospermum from the Lopingian (late Permian) floras of China
	Spencer, Alan R. T.; Wang, Shi-Jun ; Dunn, Michael T.; Hilton, Jason 4
	2013
发表期刊	JOURNAL OF ASIAN EARTH SCIENCES
ISSN	1367-9120
卷号	76 页码:59-69
摘要	The medullosan pteridosperm ovule Stephanospermum Brongniart is a well-known component of Carboniferous aged coal-ball and siderite nodule floras from North America and Europe but also occurs in the Permian floras of Cathaysia where it is represented by the Lopingian (late Permian) aged species Stephanospermum trunctatum (Li) Wang et al. (2009) from coal-balls in the Wangjiazhai Formation in Southern China. We provide a detailed emendation of S. trunctatum and illustrate it comprehensively for the first time, and document an additional specimen from the Wangjiazhai Formation coal-ball assemblage that we assign to Stephanospermum shuichengensis sp. nov. S. shuichengensis is distinguished from S. trunctarum by the absence of apical teeth in the sclerotesta and non-obovate base. The two species of Stephanospermum from the Wangjiazhai Formation are important as they extend the stratigraphic and geographical range of the genus from the Pennsylvanian of Euramerica into the Lopingian of Southern China, and demonstrate that the genus persisted in wetland, peat forming environments in the run up to the end-Permian mass extinction event. The 44 MY stratigraphic discontinuity between the Euramerican and the Cathaysian species, here named the Stephanospermum gap, leads us to infer that the genus was likely to have occurred in the Pennsylvanian-Permian successions of southern Russia and northern China that are geographically and stratigraphically intermediate to the known occurrences but from which the genus has yet to be discovered. Medullosan pteridosperms appear to have become extinct at or immediately prior to the Permian-Triassic boundary that coincides with the Permo-Trias mass extinction event; although the exact causes of this loss in plant diversity remains unknown, a response to regional climatic drying is likely to have been a contributing factor. (C) 2013 Elsevier Ltd. All rights reserved.
关键词	Gymnosperm Medullosales Trigonocarp Coal-ball Wangjiazhai Formation Shuicheng
学科领域	Geosciences, Multidisciplinary
DOI	10.1016/j.jseaes.2013.07.030
收录类别	SCI
语种	英语
WOS关键词	SOUTHERN CHINA ; PTERIDOSPERMS ; PLANTS ; GENUS ; NOV
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000326255500006
出版者	PERGAMON-ELSEVIER SCIENCE LTD
Special Issue	SI
文献子类	Article
出版地	OXFORD
EISSN	1878-5786
资助机构	ARTS at Imperial College London ; CAS(Chinese Academy of Sciences) ; National Natural Science Foundation of China(National Natural Science Foundation of China (NSFC))
作者邮箱	Spencer, Alan/V-5235-2019 ; Hilton, Jason/F-5830-2012
引用统计	被引频次：8[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/27960
专题	系统与进化植物学国家重点实验室
作者单位	1.[Spencer, Alan R. T.] Univ London Imperial Coll Sci Technol & Med, Dept Earth Sci & Engn, London SW7 2BP, England 2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Jiangsu, Peoples R China 3.Chinese Acad Sci, Inst Bot, State Key Lab Systemat & Evolutionary Bot, Beijing 100093, Peoples R China 4.Dunn, Michael T.] Cameron Univ, Dept Biol Sci, Lawton, OK 73505 USA 5.Univ Birmingham, Sch Geog Earth & Environm Sci, Birmingham B15 2TT, W Midlands, England
推荐引用方式 GB/T 7714	Spencer, Alan R. T.,Wang, Shi-Jun,Dunn, Michael T.,et al. Species of the medullosan ovule Stephanospermum from the Lopingian (late Permian) floras of China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2013,76:59-69.
APA	Spencer, Alan R. T.,Wang, Shi-Jun,Dunn, Michael T.,&Hilton, Jason.(2013).Species of the medullosan ovule Stephanospermum from the Lopingian (late Permian) floras of China.JOURNAL OF ASIAN EARTH SCIENCES,76,59-69.
MLA	Spencer, Alan R. T.,et al."Species of the medullosan ovule Stephanospermum from the Lopingian (late Permian) floras of China".JOURNAL OF ASIAN EARTH SCIENCES 76(2013):59-69.

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