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首页> 外文期刊>Geoscience frontiers >Two new species of Mesozoic tree ferns (Osmundaceae: Osmundacaulis) in Eurasia as evidence of long-term geographic isolation
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Two new species of Mesozoic tree ferns (Osmundaceae: Osmundacaulis) in Eurasia as evidence of long-term geographic isolation

机译：两种新的中生代树蕨类植物（Osmundaceae：奥斯蒙卡州）在欧亚亚洲作为长期地理隔离的证据

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The fossil trunks and rhizomes of Osmundaceae provide important information about its evolutionary history. Due to limited records of the Mesozoic trunks and rhizomes in the Eurasia of the Northern Hemisphere, our understanding on the fossil diversity of the Osmundaceae is hindered. Two new species of the Osmundaceae trunks,Osmundacaulis asiaticasp. nov. andOsmundacaulis sinicasp. nov. representing the first discovery of the Mesozoic tree fern genusOsmundacaulisin Eurasia, are described from Wudalianchi and Qiqihar, Heilongjiang Province, Northeast China, which enriches the plant diversity of the Osmundaceae in the Eurasia, and provides vital evidence for studying the distribution, radiation and evolution of the genus during the Cretaceous. The fossil records suggest thatOsmundacaulisspecies may have evolved from a common ancestor, which first appeared in the Australian portion of Pangaea, and then spread to ancient northern North America and ancient East Asia. Since then, they developed into different species through their own evolutionary lines. The Chinese species have a special local feature that the outer cortex is thicker than the inner cortex, in contrast with reportedOsmundacaulisspecies having thinner outer cortex and thicker inner cortex. Long-term geographic isolation may have led to the radiation of diverseOsmundacaulisspecies and the appearance of region-specific features, such as the thick outer cortex and the thin inner cortex of the Chinese species. Among all reportedOsmundacaulisspecies, the two new species found in China,O.?neriifrom the Jurassic of Australia and theO.?lemoniifrom the Jurassic of the USA, have special groups of mucilage-sacs inside sclerenchyma ring of petiole base. Mucilage sacs probably originated independently among taxonomic groups, representing convergent adaptations to similar habitats, rather than indicating genetic inheritance from a common ancestor.
机译：Osmundaceae的化石树干和根茎提供有关其进化历史的重要信息。由于北半球欧亚欧亚中生代躯干和根茎的记录有限，我们对奥斯蒙古雅的化石多样性的理解受到阻碍。两种新的奥斯蒙古雅躯干，奥斯蒙卡斯asiaticasp。 11月。 andosmundacaulis sinicasp。 11月。代表中生代树蕨类植物Genusosmundacaulisin Eurasia的第一次发现，是来自华龙江省东北地区华龙江省的乌瓦哈尔（Qiqihar）中描述，这丰富了欧亚欧洲奥斯蒙古西的植物多样性，并为研究分销，辐射和演变提供了重要证据白垩纪期间的属。化石记录表明，据称撒蒙卡索斯特派比斯可能已经从一个共同的祖先演变，首先出现在南方的澳大利亚部分，然后传播到古北美和古代东亚。从那时起，他们通过自己的进化线开发成不同的物种。中国物种具有特殊的本地特征，即外皮厚度比内皮层厚，相反，据报道的外皮层和较厚的内皮层较厚。长期地理隔离可能导致多样性的辐射和区域特异性特征的外观，例如厚的外皮和中国物种的薄内皮。在所有据说的两种新物种中，在中国发现的两种新物种，o。？Neriifrom澳大利亚的侏罗纪和美国的侏罗纪，在叶柄基地的硬脑孔瘤中有特殊的粘膜囊组。粘液囊可能起源于分类群中的独立，代表与类似栖息地的会聚适应，而不是指示来自共同祖先的遗传。

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