Oligocene Limnobiophyllum (Araceae) from the central Tibetan Plateau and its evolutionary and palaeoenvironmental implications

doi:10.1080/14772019.2019.1611673

	Oligocene Limnobiophyllum (Araceae) from the central Tibetan Plateau and its evolutionary and palaeoenvironmental implications
	Low, Shook Ling 1; Su, Tao 1,2; Spicer, Teresa E. V.3; Wu, Fei-Xiang 4,5; Deng, Tao2,4 ; Xing, Yao-Wu 1; Zhou, Zhe-Kun1,6
通讯作者	Xing, Yao-Wu(ywxing@xtbg.org.cn) ; Zhou, Zhe-Kun(zhouzk@xtbg.ac.cn)
	2019-10-16
发表期刊	JOURNAL OF SYSTEMATIC PALAEONTOLOGY
ISSN	1477-2019
页码	17
摘要	The extinct genus Limnobiophyllum (Araceae) has been considered a tentative link between the Aroideae and Lemnoideae subfamilies of Araceae. General understanding of morphological character evolution among these subfamilies has been limited due to the lack of preserved key structures in fossils such as infructescences. In this study, a new fossil species, Limnobiophyllum pedunculatum Low, Su & Xing sp. nov., is reported based on unusually complete specimens with intact leaves, stolon and attached infructescence and seeds from the late Oligocene of central Tibet, China. It represents the first convincing Limnobiophyllum fossil from the Tibetan Plateau and the first well-documented occurrence from east Asia. Its phylogenetic position was inferred using a matrix of 56 morphological characters and 5226 gene sequences of 41 taxa. Phylogenetic inference based on the matrix suggests that Limnobiophyllum is sister to Cobbania, as well as to the remaining extinct and living genera within the Araceae subfamily Lemnoideae. Reconstruction of vegetative and reproductive character evolution confirms that Limnobiophyllum possessed intermediate characters, especially for infructescences, between the subfamilies Lemnoideae and Aroideae. Within Lemnoideae, both vegetative and reproductive characters show clear reduction and simplification from extinct genera to living lemnoids. These findings shed new light on the evolutionary history of the family Araceae. In addition, the discovery of this species, in association with the surrounding plant megafossil assemblage, suggests a warm, humid lowland environment in the central Tibetan Plateau during the late Oligocene, contradicting previous studies that indicated high elevation of the plateau since the early Palaeogene. However, the extinction of Limnobiophyllum might have been due to both global cooling and orogenesis.
关键词	Araceae extinction infructescence Lemnoideae Limnobiophyllum Tibetan Plateau
DOI	10.1080/14772019.2019.1611673
收录类别	SCI ; SCI
语种	英语
WOS记录号	WOS:000490936000001
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/69851
专题	中国科学院东亚植物多样性与生物地理学重点实验室
通讯作者	Xing, Yao-Wu; Zhou, Zhe-Kun
作者单位	1.Chinese Acad Sci, Xishuangbanna Trop Bot Garden, CAS Key Lab Trop Forest Ecol, Mengla 666303, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Bot, State Key Lab Systemat & Evolutionary Bot, Beijing 100093, Peoples R China 4.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins, Beijing 100044, Peoples R China 5.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, Beijing 100101, Peoples R China 6.Chinese Acad Sci, Kunming Inst Bot, Key Lab Plant Divers & Biogeog East Asia, Kunming 650204, Yunnan, Peoples R China
推荐引用方式 GB/T 7714	Low, Shook Ling,Su, Tao,Spicer, Teresa E. V.,et al. Oligocene Limnobiophyllum (Araceae) from the central Tibetan Plateau and its evolutionary and palaeoenvironmental implications[J]. JOURNAL OF SYSTEMATIC PALAEONTOLOGY,2019:17.
APA	Low, Shook Ling.,Su, Tao.,Spicer, Teresa E. V..,Wu, Fei-Xiang.,Deng, Tao.,...&Zhou, Zhe-Kun.(2019).Oligocene Limnobiophyllum (Araceae) from the central Tibetan Plateau and its evolutionary and palaeoenvironmental implications.JOURNAL OF SYSTEMATIC PALAEONTOLOGY,17.
MLA	Low, Shook Ling,et al."Oligocene Limnobiophyllum (Araceae) from the central Tibetan Plateau and its evolutionary and palaeoenvironmental implications".JOURNAL OF SYSTEMATIC PALAEONTOLOGY (2019):17.

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