MACNBR   00242
MUSEO ARGENTINO DE CIENCIAS NATURALES "BERNARDINO RIVADAVIA"
Unidad Ejecutora - UE
artículos
Título:
Oligocene ferns from the Rancahué Formation (Aluminé, Neuquén, Argentina): Cuyenopteris patagoniensis gen. et sp. nov. (Polypodiales: Blechnaceae/Dryopteridaceae) and Alsophilocaulis calveloi Menéndez emend. (Cyatheales: Cyatheaceae)
Autor/es:
VERA, EZEQUIEL IGNACIO
Revista:
GEOBIOS
Editorial:
Elsevier
Referencias:
Lugar: Amsterdam; Año: 2010 vol. 43 p. 465 - 465
ISSN:
0016-6995
Resumen:
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 gen. et sp. nov. 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.