Gleditisioxylon riojana nov. sp. en el Ne¨®geno de Argentina: sus relaciones paleoambientales y biogeogr¨¢ficas

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• 作者：Leandro C.A. Mart&#237 ; nezp>ap>p> ;   ; p>p>bp>p> ;   ; p>p>gesaghi@gmail.comp> ; Rafael Rodr&#237 ; guez-Brizuelap>cp>
• 关键词：Leguminosae ; Caesalpinoideae ; Fossil wood ; Toro Negro Formation ; Neogene ; La Rioja ; Argentina
• 刊名：Geobios
• 出版年：2011
• 出版时间：September-October 2011
• 年：2011
• 卷：44
• 期：5
• 页码：461-472
• 全文大小：2868 K

文摘

<p>A new fossil species of Leguminosae is described from Neogene of northwest of Argentina. The good preservation of tissues and the diagnostic characters present in this fossil wood let assigning it to a new species of Gleditisioxylon M¨¹ller-Stoll and Madel. Gleditisioxylon riojana nov. sp. (Caesalpinoideae) has diagnostic features such as: growth rings distinct, semi-annular porosity, vestured pits, helical thickenings, simple plates, paratracheal parenchyma and rays 1-6 seriate. The possible climatic conditions of Toro Negro Formation were inferred by the use of xylological characters presents in this fossil wood. The presence of Gleditsioxylon added to other data, suggest a new hypothesis to explain the disjunction of Gleditsia L. genus and the occurrence of a single extant species in tropical and subtropical South America.