A new fossil record of Palaeosinomenium (Menispermaceae) from the Upper Eocene in the southeastern margin of the Tibetan Plateau and its biogeographic and paleoenvironmental implications

被引：3
作者：
Wu, Mengxiao [1 ]
Huang, Jian [1 ,2 ]
Manchester, Steven R. [3 ]
Tang, He [4 ]
Gao, Yi [1 ,5 ]
Wang, Tengxiang [6 ,7 ]
Zhou, Zhekun [1 ]
Su, Tao [1 ,2 ]
机构：
[1] Chinese Acad Sci, CAS Key Lab Trop Forest Ecol, Xishuangbanna Trop Bot Garden, Mengla 666303, Yunnan, Peoples R China
[2] Chinese Acad Sci, Southeast Asia Biodivers Res Inst, Naypyitaw 05282, Myanmar
[3] Univ Florida, Florida Museum Nat Hist, Gainesville, FL 32611 USA
[4] Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China
[5] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[6] Penn State Univ, Dept Geosci & Earth, University Pk, PA 16802 USA
[7] Penn State Univ, Environm Syst Inst, University Pk, PA 16802 USA
来源：
REVIEW OF PALAEOBOTANY AND PALYNOLOGY | 2023年 / 310卷
基金：
中国国家自然科学基金;
关键词：
Palaeosinomenium; Late Eocene; Endocarp; Jianchuan Basin; PHYLOGENY; EVOLUTION; PALEOGENE; MIDDLE; BASIN; TRANSITION; PALEOCENE; ENDOCARPS; FRUITS; FLORA;
D O I：
10.1016/j.revpalbo.2022.104827
中图分类号：
Q94 [植物学];
学科分类号：
071001 ;
摘要：
Palaeosinomenium Chandler (Menispermaceae) was established to accommodate the fossil endocarps that share similar morphological characteristics with the tribe Menispermeae in Menispermaceae. Previous fossil records suggested that Palaeosinomenium was distributed in North America, Europe, and East Asia before the Middle Eocene. A new fossil species, Palaeosinomenium hengduanensis Meng-Xiao Wu et Zhe-Kun Zhou sp. nov., was es-tablished based on an endocarp impression fossil from the Upper Eocene (35 +/- 1 Ma) Shuanghe Formation, Jianchuan Basin, southwestern China. The new species is characterized by a horseshoe-shaped endocarp, an excavated central area, surrounded by a slightly asymmetrical C-shaped lateral ridge, and an elliptic aperture lo-cated near the longer endocarp limb. The fossil site is located in the modern distribution area of the living species Sinomenium acutum (Thunb.) Rehd. et Wils, a potential nearest living relative of the new species. The finding of P. hengduanensis supports that the divergence within the tribe Menispermeae might have occurred by the Late Eocene and the species similar to modern S. acutum appeared in the southeastern margin of the Tibetan Plateau as early as in the Late Eocene.(c) 2022 Elsevier B.V. All rights reserved.
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页数：8
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