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Chengia laxispicata gen. et sp. nov. a new ephedroid plant from the Early Cretaceous Yixian Formation of western Liaoning Northeast China: evolutionary taxonomic and biogeographic implications

机译:桔梗等。十一月来自中国辽西西部白垩纪早期义县组的一种新的麻黄类植物:进化分类学和生物地理学意义

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摘要

BackgroundThe extant Gnetales include three monotypic families, namely, Ephedraceae (Ephedra), Gnetaceae (Gnetum), and Welwitschiaceae (Welwitschia), all of which possess compound female cones that comprise a main axis and 1 to multiple pairs/whorls of bracts subtending a female reproductive unit or having lower pairs/whorls of bracts sterile. However, the evolutionary origin of such a reproductive architecture in Gnetales is controversial in the light of the competing anthophyte versus gnetifer hypotheses of seed plant relationships. Hence, macrofossils demonstrating the structure of compound female cones of the Gnetales should be important to decipher the early evolution of the order.
机译:背景现存的Gnetales包括三个单型科,即麻黄科(Ephedra),菊科(Gnetum)和千岁科(Welwitschia),它们均具有复合雌球果,它们组成主轴线,并且有1对或多对//对着雌性的female片生殖单位或无菌的pairs片对较低/成对。但是,鉴于种子植物关系中的古生植物与遗传植物竞争的假设,在Gnetales中这种生殖结构的进化起源是有争议的。因此,证明金雀花雌性圆锥体结构的大型化石对于破译该阶的早期演化很重要。

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