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• W2028993709 abstract "The study of abundant permineralized fern remains collected in the Oligocene Rancahué Formation (Neuquén Province, Argentina) allowed the identification of two different taxa. The name Cuyenopteris patagoniensis nov. gen., nov. sp. is proposed for several stems and fronds characterized by the presence of caulinar dictyosteles with root gaps, producing C-shaped leaf traces composed by two hippocampiform bundles flanked by eight to ten small round bundles, half of them diverging from cauline meristeles and the rest from the hippocampiform bundles. The presence of these features, along with frond bases with adaxial grooves and a pair of pneumatophores, suggest affinities with the Blechnaceae or Dryopteridaceae. The second identified taxon is Alsophilocaulis calveloi Menéndez. Based on features observed in these new materials, including characteristics of the mantle of adventitious roots and anatomy of the petiole bases, an emended diagnosis for this latter species is proposed. L’étude d’abondants échantillons de fougères perminéralisés recueillis dans la Formation Rancahué (Oligocène ; Province de Neuquén, Argentine) a permis l’identification de deux taxons différents. Le nom de Cuyenopteris patagoniensis nov. gen., nov. sp. est proposé pour des frondes et des stipes caractérisés par la présence de dictyostèles caulinaires, avec des traces vasculaires en forme de C, et des traces racinaires. Les traces vasculaires sont composées de deux cordons en forme d’hippocampe, entourés de huit à dix petits cordons ronds. La présence de ces caractères et des frondes portant des rainures adaxiales et des pneumatophores à la base suggèrent des rapports avec les Blechnaceae où les Dryopteridaceae. La diagnose émendée d’Alsophilocaulis calveloi Menéndez est proposée à partir de l’observation détaillée du manchon de racines aériennes et des bases des pétioles dans un stipe récemment recueilli." @default.
• W2028993709 created "2016-06-24" @default.
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• W2028993709 date "2010-07-01" @default.
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• W2028993709 title "Oligocene ferns from the Rancahué Formation (Aluminé, Neuquén, Argentina): Cuyenopteris patagoniensis nov. gen., nov. sp. (Polypodiales: Blechnaceae/Dryopteridaceae) and Alsophilocaulis calveloi Menéndez emend. Vera (Cyatheales: Cyatheaceae)" @default.
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• W2028993709 doi "https://doi.org/10.1016/j.geobios.2009.12.003" @default.
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