A new gnetalean macrofossil from the Early Cretaceous and its evolutionary significance

doi:10.3389/fpls.2017.00950

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	A new gnetalean macrofossil from the Early Cretaceous and its evolutionary significance
	Yang, Yong ; Lin, Long-Biao ; Ferguson, David K.; Zhang, Shou-Zhou ; Wan, Tao 3
刊名	CRETACEOUS RESEARCH
	2017
卷号	74 页码:56-64
关键词	Early Cretaceous Evolution Female spike Gnetophytes Liaoningia decussate Yixian formation
ISSN号	0195-6671
DOI	10.3389/fpls.2017.00950
文献子类	Article
英文摘要	Modern gnetophytes consist of three families, i.e. the Ephedraceae, the Gnetaceae, and the Welwitschiaceae, which show diversified morphology. The basal group Ephedraceae possesses an extremely reduced female cone with only the uppermost pair/whorl being fertile, while both the Gnetaceae and the Welwitschiaceae bear female cones/spikes with multiple whorls of fertile bracts. Here, we describe a new ephedroid macrofossil, Liaoningia decussata Yang et Lin, gen. et sp. nov., from the Lower Cretaceous Yixian Formation of western Liaoning in China. This species has typical ephedroid morphology, e.g. the dichasial branching shoot system, swollen nodes, internodes having many fine longitudinal striations, and decussate phyllotaxy, lengthy linear leaves possessing two parallel veins, and female cones consisting of paired bracts. This new genus is similar to the Ephedraceae in its vegetative organs, but differs from the latter by the female spikes with multiple pairs of fertile bracts. In this respect Liaoningia is similar to both the Gnetaceae and the Welwitschiaceae, but distinctly differs from the latter two genera in its vegetative organs. As a result, our new genus shows intermediate morphology between the Ephedaceae and the other two families of the gnetophytes, and is probably a missing link in the evolutionary process from the Ephedraceae to the Glade including the Gnetaceae and the Welwitschiaceae. (C) 2017 Elsevier Ltd. All rights reserved.
学科主题	Plant Sciences
电子版国际标准刊号	1095-998X
出版地	LONDON
WOS关键词	YIXIAN FORMATION ; SP-NOV ; EPHEDROID PLANT ; GEN. ; DIVERSITY ; ONTOGENY ; SEEDS ; EPHEDRACEAE ; GNETOPHYTES ; PORTUGAL
语种	英语
出版者	ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
WOS记录号	WOS:000402858100005
资助机构	National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31270238, 31470301, J1310002] ; Scientific Research Project of Shenzhen Urban Administration [201519] ; Innovation of Science and Technology Commission of Shenzhen [JSGG20140515164852417]
内容类型	期刊论文
源URL	[http://ir.ibcas.ac.cn/handle/2S10CLM1/22194]
专题	系统与进化植物学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Bot, State Key Lab Systemat & Evolutionary Bot, 20 Nanxincun, Beijing 100093, Peoples R China 2.Shenzhen Fairy Lake Bot Garden, Shenzhen, Peoples R China 3.Ferguson, David K.] Univ Vienna, Dept Paleontol, Vienna, Austria 4.China Railway Grp Ltd, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Yang, Yong,Lin, Long-Biao,Ferguson, David K.,et al. A new gnetalean macrofossil from the Early Cretaceous and its evolutionary significance[J]. CRETACEOUS RESEARCH,2017,74:56-64.
APA	Yang, Yong,Lin, Long-Biao,Ferguson, David K.,Zhang, Shou-Zhou,&Wan, Tao.(2017).A new gnetalean macrofossil from the Early Cretaceous and its evolutionary significance.CRETACEOUS RESEARCH,74,56-64.
MLA	Yang, Yong,et al."A new gnetalean macrofossil from the Early Cretaceous and its evolutionary significance".CRETACEOUS RESEARCH 74(2017):56-64.