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题名: Male spike strobiles with Gnetum affinity from the Early Cretaceous in western Liaoning, Northeast China
作者: Guo, Shuang-Xing1, 2; Sha, Jin-Geng3; Bian, Li-Zeng4; Qiu, Yin-Long5
刊名: JOURNAL OF SYSTEMATICS AND EVOLUTION
关键词: biogeography ; Early Cretaceous ; Gnetum affinity ; male spike strobiles ; northeastern China
英文摘要: A fossil with Gnetum affinity was found in the Jianshangou Member (Barremian Age) of the Yixian Formation (Lower Cretaceous Epoch) of the Jehol Group in western Liaoning, northeastern China. The single fossil specimen is represented by both elongate-cylindrical male spike strobiles which home within a nodal bract of cauliflorous branch. The spike strobiles have apparent nodes, invisible internodes, and numerous verticillate involucral collars. The microsporangiate units within involucral collars are not seen. The male spike strobiles with verticillate involucral collars occur exclusively in Gnetum; hence, the fossil strobiles are attributed to a new taxon, Khitania columnispicata gen. & sp. nov., being closely related to Gnetum. The general isotopic dating suggests an age of Barremian, ca. 125-122 million years (Myr) ago for the Jianshangou Member. The palaeoecological and palaeoclimatic inference based on the compositions of flora and fauna, and lithological characters of the fossil locality suggests that the fossil plants grew in a subtropical mesophytic forest and under a warmer climate. The remains of male spike strobiles are the first record of gnetalean macrofossil. It documents the evolution of the distinct gnetoid morphology and indicates a wider range of distribution of Gnetaceae in the Early Cretaceous than present day.
出版日期: 2009-03-01
卷号: 47, 期号:2, 页码:93-102
语种: 英语
收录类别: SCI
学科分类: Plant Sciences
ISSN号: 0529-1526
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.kib.ac.cn/handle/151853/2713
Appears in Collections:中国科学院东亚植物多样性与生物地理学重点实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Nanjing Inst Geol & Paleontol, Dept Palaeobot & Palynol, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Kunming Inst Bot, Lab Biodivers & Biogeog, Kunming 650204, Peoples R China
3.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China
4.Nanjing Univ, Coll Earth Sci, Nanjing 210093, Peoples R China
5.Univ Michigan, Univ Herbarium, Dept Ecol & Evolutionary Biol, Ann Arbor, MI 48109 USA

Recommended Citation:
Guo, SX; Sha, JG; Bian, LZ; Qiu, YL.Male spike strobiles with Gnetum affinity from the Early Cretaceous in western Liaoning, Northeast China,JOURNAL OF SYSTEMATICS AND EVOLUTION,2009,47(2):93-102
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