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Early Diversification of Vascular Plants-Evidence from South China

机译:维管植物的早期多样化-来自中国南方的证据

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Devonian vascular plants of South China consist of the zosterophylls,lycopsids,cladoxylopsids,sphenopsids,progymnosperms and abundant genera of unknown affinity.These plants demonstrate great diversity and high level of evolution.Besides some cosmopolitan taxa (e.g.,Zosterophyllum,Drepanophycus,Sublepidodendron,Lepidodendropsis,Leptophloeum,Psilophyton,Sphenophyllum and Archaeopteris),they contain numerous endemic elements.Early Devonian flora (e.g.,Posongchong assemblage) of South China is characterized by possible ancestors (e.g.,Discalis,Estinnophyton,Eophyllophyton,Yunia,Celatheca and Polythecophyton) of major plant clades (lycopsids,sphenopsids,ferns and progymnosperms).Posongchong (Pragian)-Xujiachong (Pragian-Emsian)assemblage share Hedeia,Baragwanathia and Zosterophyllum australianum with (?) Late SilurianEarly Devonian Australia flora (Tims and Chambers,1984;Hao and Gensel,1998;Wang et al.,2002).Consequently,a northeastern Gondwana phytogeographic unit has been proposed to comprise Australia,South China and perhaps Shan-Thai Blocks during the Early Devonian (Hao and Gensel,1998).Middle Devonian (Givetian) flora (e.g.,Xichong assemblage) possesses lot of unusual plants (e.g.,Rhipidophyton and Eocladoxylon) but lacks distinct iridopteridalean and pseudosporochnalean cladoxylopsids and aneurophytalean progymnosperms that are common on Gondwana and Laurussia continents (Berry and Wang,2006).During the Late Devonian (Frasnian and Famennian),South China has many endemic plants (e.g.,Hamatophyton and Metacladophyton),although it shares some cosmopolitan elements (e.g.,Archaeopteris) with other continents including Australia and blocks.
机译:华南泥盆纪维管束植物由带叶类植物,番茄红素类,cladoxylopsids,蝶类,前生子植物和丰富的亲缘属组成。这些植物表现出高度的多样性和高度的进化。除一些世界性的类群外(如带状植物,带状线虫,鳞翅目,鳞翅目,亚纲) ,Leptophloeum,P.ilophyton,Sphenophyllum和Archaeopteris),它们包含许多特有元素。华南的泥盆纪早期植物区系(如Posongchong组合)的特征是可能的祖先(如Discalis,Estinnophyton,Eophyllophyton,Yunia,Celatheca和Polytheca) Posongchong(古希腊语)-Xujiachong(古希腊语-Emsian)组合共享Hedeia,Baragwanathia和Zosterophyllum australianum与(?)晚志留纪早期的泥盆纪澳大利亚植物区系(Tims和Chambers) ,1998; Wang等人,2002)。因此,有人提议将冈瓦纳东北部的植物地理单元在泥盆纪早期(Hao和Gensel,1998年)获得澳大利亚,华南地区和山泰地块的奖励。中泥盆纪(纪梵天)植物区系(例如西冲组合)拥有许多不寻常的植物(例如Rhipidophyton和Eocladoxylon),但缺乏明显的优势。在冈瓦纳大陆和月桂大陆上普遍存在虹彩蝶嘴and和假孢子na壳的无节肢类和厌氧性裸子植物(Berry and Wang,2006)。在泥盆纪晚期(Frasnian和Famennian)期间,华南地区有许多特有植物(例如,Hamatophyton和Metacladophyphys)一些世界性元素(例如,Archaeopteris)与包括澳大利亚和街区在内的其他大洲。

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