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首页> 外文期刊>International journal of plant sciences >ANATOMY OF THE LATE DEVONIAN DENGLONGIA HUBEIENSIS, WITH A DISCUSSION OF THE PHYLOGENY OF THE CLADOXYLOPSIDA
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ANATOMY OF THE LATE DEVONIAN DENGLONGIA HUBEIENSIS, WITH A DISCUSSION OF THE PHYLOGENY OF THE CLADOXYLOPSIDA

机译：晚泥盆纪的邓白氏淋巴结的解剖学，讨论冠毛线虫的植物学

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摘要

A previous study of the Late Devonian cladoxylopsid Denglongia bubeiensis Xue et Hao provided a detailed morphological description, while new material from the type locality of the Huangjiadeng Formation, Hubei Province, China, reported here reveals details of anatomy. Main axes are actinostelic in transverse sections, showing a primary xylem column with five or six xylem ribs separated by deep embayments. First-order axes have a deeply ribbed primary xylem column with four xylem ribs. Each stelar rib has two permanent, mesarch protoxylem strands near its periphery. Tracheids interpreted as protoxylem show annular or helical thickenings. Metaxylem tracheids have scalariform and elliptical bordered pits. Anatomically, Denglongia is more similar to the iridopteridaleans than to other plants in the actinostele, the peripheral protoxylem strands, the disintegration of protoxylem tracheids, and the pitting pattern of metaxylem tracheids. The phylogeny of the Cladoxylopsida was evaluated by parsimony and Bayesian cladistic analyses. The results showed that the Pseudosporochnales constitute a very robust monophyletic group supported by a suite of characters: the presence of arborescence; digitate branching; straight tips of sterile ultimate appendages; dissected primary xylem; elliptical to strap-shaped primary xylem strands; and sclereids in the cortex. The monophyly of the Iridopteridales is questioned in that the previously suggested defining characters, whorled branching and peripheral protoxylem strands, are considered more plesiomorphic in the cladistic context. The relationship between the iridopteridaleans and the sphenophyllaleans is weakly supported. The Bayesian analysis recognized a tentative "iridopteridalean-based group," in which the iridopteridaleans, Denglongia, Metacladopbyton Wang et Geng, Polypetalophyton Geng, and their probable relatives are nested within an unresolved polytomy.
机译：先前对泥盆纪克拉德扁叶藻Denglongia bubeiensis Xue et Hao的先前研究提供了详细的形态学描述，而来自中国湖北省黄家灯组类型局部的新材料在此报道了解剖学细节。主轴的横断面是放线齿，显示了一个主要的木质部圆柱体，其中有五个或六个木质部肋骨，被深层分隔。一阶轴具有深肋的初级木质部柱，具有四个木质部肋。每个石柱肋骨在其外围附近都有两条永久的，甲壳质的原丙交酯链。被解释为protoxylem的气管显示环形或螺旋形增厚。甲生水胞管有鳞状和椭圆形的凹坑。从解剖学上讲，与放线虫，环生的protoxylem链，protoxylem气管的解体以及后生的木质部气管的蚀斑模式相比，Denglongia与鸢尾科动物更相似。通过简约和贝叶斯分类分析评估了克拉德氏菌的系统发育。结果表明，假孢子虫构成一个非常强大的单系统群体，并受到一系列特征的支持：树突的存在；数字化分支；无菌终末肢的笔直尖端；解剖的初生木质部；椭圆形至带状初级木质部股；和皮质中的硬化细胞。虹鳟科的单方面性受到质疑，因为先前提出的限定性特征，即轮生的分支和外围的Protoxylem链，被认为在多形性背景下具有多形性。鸢尾科和蝶科之间的关系得到了弱支持。贝叶斯分析认可了一个暂定的“基于鸢尾科的群体”，其中鸢尾科，登革兰，Metacladopbyton Wang et Geng，Polypetalophyton Geng及其可能的亲戚被嵌套在一个未解决的多形体中。

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  • 来源
    《International journal of plant sciences》 |2010年第1期|107-120|共14页
  • 作者

    Jinzhuang Xue; Shougang Hao; James F. Basingert;

  • 作者单位

    Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, People's Republic of China;

    Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, People's Republic of China;

    Department of Geological Sciences, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Late Devonian; China; cladoxylopsida; plant fossils; phylogeny; cladistic analysis;

    机译：晚泥盆纪;中国;cladoxylopsida;植物化石;系统发育进化分析;
  • 入库时间 2022-08-18 03:45:39

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