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首页> 外文期刊>Journal of Systematic Palaeontology >First record of fossil Trachycarpeae in Africa: three new species of Palmoxylon from the Oligocene (Rupelian) Gebel Qatrani Formation, Fayum, Egypt
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First record of fossil Trachycarpeae in Africa: three new species of Palmoxylon from the Oligocene (Rupelian) Gebel Qatrani Formation, Fayum, Egypt

机译：非洲化石Tra的化石的第一笔记录：来自埃及渐新世（Rupelian）Gebel Qatrani组的三种新的棕榈香

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摘要

Based on a survey of the fossil wood flora of Gebel Qatrani (Rupelian, Fayum, Egypt), three new species of palm stem are described: Palmoxylon araneus Nour-El-Deen, El-Saadawi & Thomas sp. nov., Palmoxylon elsaadawii Nour-El-Deen & Thomas sp. nov. and Palmoxylon qatraniense Nour-El-Deen, El-Saadawi & Thomas sp. nov. The specimens are the first petrified palm wood to be reported from the deposits in the upper sequence of the Gebel Qatrani Formation. They are characterized by fibrovascular bundles with two vessels, the presence of a ground parenchyma sustained growth, fibrous bundles, globular echinate phytoliths, radiating parenchyma, and multiseriate scalariform thickening of metaxylem elements. Palaeoclimatic inferences and comparisons with similar fossil stems are discussed for each of the three taxa. Comparisons with extant palms allow identification of these species to tribal (Trachycarpeae) and subfamilial (Coryphoideae) levels. They are the first representatives of tribe Trachycarpeae on the African continent. An attempt is also made to explain migration events and discuss the current and fossil distribution of the tribe in Africa.
机译：根据对Gebel Qatrani（Rupelian，Fayum，埃及）的化石木材植物区系的调查，描述了三种新的棕榈茎种：Palmoxylon araneus Nour-El-Deen，El-Saadawi和Thomas。十一月，Palmoxylon elsaadawii Nour-El-Deen和Thomas。十一月以及No.-El-De-en，El-Saadawi和Thomas的Palmoxylon qatraniense。十一月这些标本是第一个从Gebel Qatrani组上游序列的沉积物中报告的硅化棕榈木。它们的特征是具有两个血管的纤维血管束，存在持续生长的实质薄壁组织，纤维束，球状棘状叶基石，放射状薄壁组织和后叶木质部元素的多序列鳞状增厚。对于这三个分类单元中的每一个，都讨论了古气候推断和与类似化石茎的比较。与现存的棕榈树进行比较可以将这些物种鉴定为部族（Trachycarpeae）和亚家族性（Coryphoideae）的水平。他们是非洲大陆上的Trachycarpeae部落的首批代表。还试图解释移民事件并讨论非洲部落的当前和化石分布。

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