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首页> 外文期刊>Palaeoworld >Middle Miocene Cephalotaxus (Taxaceae) from Yunnan, Southwest China, and its implications to taxonomy and evolution of the genus
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Middle Miocene Cephalotaxus (Taxaceae) from Yunnan, Southwest China, and its implications to taxonomy and evolution of the genus

机译：来自云南，中国云南，中国的中间内肾上腺素（Taxaceae）及其对属植物分类和进化的影响

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摘要

The infrageneric taxonomy of the genus Cephalotaxus Siebold et Zuccarini ex Endlicher (Taxaceae) is controversial as morphological characters have been doubted to change coherently among species. Although the epidermal features are considered as important characters in the taxonomy of conifers, they have not been systematically studied in this genus. Neogene foliage shoots with well-preserved epidermal structure not only can provide systematic links to the extant species, but also have implications for the taxonomical definition of the extant species by their epidermal features. In this paper, the morphologies of leafy shoots combining epidermal structure of a Neogene Cephalotaxus, which was collected from the middle Miocene of Southwest China, and ten extant species (variants) were studied. Morphology as well as epidermal structures was compared among species (variants) in Cephalotaxus. Based on the comparisons, the taxonomical definition of extant species in genus Cephalotaxus are discussed. Our results indicate that leaf morphological characters in combination with the features of epidermal structure can distinguish species in genus Cephalotaxus. The fossil foliage shoots from the middle Miocene of Southwest China were assigned to a new species, C. maguanensis n. sp., which shows close affinities to the extant C. hainanensis. On the basis of leaf and epidermal information, we suggest there are seven extant species in Cephalotaxus. With global cooling and the uplift of the Qinghai-Tibet Plateau since the middle Miocene, the cooling climate induced the differentiation and southward expansions of C. maguanensis, and its extant offspring, C. hainanensis, is distributed to Hainan Island and the Indo-Chinese peninsula. (C) 2019 Elsevier Ireland Ltd Elsevier B.V. and Nanjing Institute of Geology and Palaeontology, CAS. Published by Elsevier B.V. All rights reserved.
机译：Cephalotaxus siebold等Zuccarini前Extenlicher（Taxaceae）的Infrageneric分类是争议的，因为形态学特征被怀疑在物种中连贯地改变。尽管表皮特征被认为是针叶树分类中的重要特征，但它们尚未在该属中进行系统地研究。 Neogene叶子射击具有完全保存的表皮结构，不仅可以提供与现存物种的系统连接，而且对其表皮特征的分类物种的分类定义也有影响。在本文中，研究了组合新生头孢囊毛囊的表皮结构的叶片芽的形态，从西南部的中西部和十个现存物种（变体）收集。在头孢星患病的物种（变体）中比较了形态学以及表皮结构。基于比较，讨论了头孢菌属植入物种的分类定义。我们的结果表明，叶片形态特征与表皮结构的特征相结合，可以区分Cephalotaxus属的种类。来自西南部中国中部的化石叶子射击被分配到新的物种，C. maguanensis n。 SP。，它显示出远端C. Hainanensis的紧密亲和力。在叶片和表皮信息的基础上，我们建议头孢星有七种现存。随着全球性的冷却和青藏高原的隆起，自中小企业以来，冷却气候诱导C. Maguanensis的分化和向南扩展，及其现存的后代C. Hainanensis分布在海南岛和印度 - 中文半岛。 （c）2019年Elsevier Ireland Ltd elestvier B.v.和南京地质学院和古生物学研究所，CAS。 elsevier b.v出版。保留所有权利。

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