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首页> 外文期刊>Journal of Systematic Palaeontology >Plenasium (Aurealcaulis) elegans sp. nov. from the Eocene of Vietnam - a connecting link in the evolution of modern Royal Ferns (Osmundeae, Osmundaceae)
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Plenasium (Aurealcaulis) elegans sp. nov. from the Eocene of Vietnam - a connecting link in the evolution of modern Royal Ferns (Osmundeae, Osmundaceae)

机译：eldenaSium（Aurealcaulis）elegans sp。 11月。来自越南的eocene - 现代皇家蕨类植物演进中的一个连接联系（奥斯蒙古群岛）

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摘要

Osmundales is the most ancient of all extant groups of leptosporangiate ferns, with an extensive fossil record from Permian to Cenozoic deposits worldwide. The group was particularly diverse during the late Palaeozoic and early Mesozoic, whereas nearly all records of fossil Osmundales from the mid-Cretaceous onwards can be assigned to the sole surviving subfamily Osmundoideae. The single exception has long remained the enigmatic Aurealcaulis - a genus of large, presumably arborescent Osmundaceae stems from the Cretaceous and Palaeogene of North America. Due to similarities especially in the unusual mode of leaf-trace formation, Aurealcaulis has recently been suggested to represent a close relative of modern Plenasium, but definite evidence for this hypothesis has thus far been lacking. Here, we describe Plenasium (Aurealcaulis) elegans sp. nov. based on a calcified trunk from the Na Duong Formation (upper middle to upper Eocene) of northern Vietnam, forming the first record of Aurealcaulis outside North America. The new species differs from all previously described members of Aurealcaulis in its uniquely thick xylem siphon and in the characteristic distribution of sclerenchyma in the stipular wings, with a single thick mass surrounded by numerous smaller strands. In its combination of anatomical features, Plenasium elegans appears intermediate between the remaining species of Aurealcaulis and fossil and extant members of Plenasium sensu stricto. Together with its comparatively young geological age and unusual geographical occurrence within the biogeographical range of extant Plenasium species, Plenasium elegans forms a threefold connecting link in the phylogeny of modern Royal Ferns.
机译：奥斯蒙大是最古老的所有现存的leptosporangatiate蕨类植物，从杂志到全球共青存款的广泛化石记录。该组在古生学和早期的中生代期间特别多样化，而几乎所有来自中白垩纪发出的化石渗透物的记录都可以分配给唯一的幸存的亚家族奥斯蒙蒂薄膜。单一例外长期以来仍然是神秘的AUREALCAULIS - 大型，大概的树木斑蛇纹科因，来自北美的白垩纪和古代代群。由于相似性，特别是在不寻常的叶迹形成模式下，最近提出了Aurealcaulis代表了现代本体的密切相关，但是这一假设的明确证据已经缺乏。在这里，我们描述了合并（Aurealcaulis）elegans sp。 11月。基于越南北部Na Duong Mablation（上部中部到上部）的钙化后备箱，形成北美以外的Aurealcaulis的第一次记录。新物种与其独特的Xylem Siphon中的所有先前描述的Aurealcaulis成员不同，并且在单个翅膀中的硬化肌动术的特征分布，具有众多较小的股线包围的单个厚的质量。在其解剖学特征的结合中，本能秀丽丽刀鞘出现在剩余的AUREALCAULIS和化石和产卵成员之间的中间体中间人。与其在现存增量种类的生物地理范围内的相对年轻的地质年龄和不寻常的地理发生，在现代皇家蕨类植物的系统发育中形成了一个三倍的连接环节。

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  • 来源
    《Journal of Systematic Palaeontology》 |2020年第12期|703-715|共13页
  • 作者

    P. Hiller; M. Boehme; S. Schneider; J. Prieto; B. Bomfleur;

  • 作者单位

    Forschungsstelle fuer Palaeobotanik Institut fuer Geologie und Palaeontologie Westfaelische Wilhelms-Universitaet Muenster Muenster Germany;

    Department of Geosciences Eberhard-Karls-Universitaet Tuebingen Tuebingen Germany Senckenberg Centre for Human Evolution and Palaeoenvironment Tuebingen Germany;

    CASP Cambridge UK;

    Department of Earth and Environmental Sciences Palaeontology Ludwig-Maximilians-University Munich Germany;

    Forschungsstelle fuer Palaeobotanik Institut fuer Geologie und Palaeontologie Westfaelische Wilhelms-Universitaet Muenster Muenster Germany;

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  • 关键词

    Osmundales; fern phylogeny; anatomy; biogeography; taxonomy; palaeoecology;

    机译：osmundales;蕨类植物发育;解剖学;生物地理;分类;古生学;

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