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Abstract:

To date only two genera of cycad stems have been described from Cenozoic strata (Bororoa and Menucoa). We describe a new species of Wintucycas, Wintucycas beatrizae sp. nov. (Encephalartoideae), from the basal Palaeogene of Patagonia. The new species is based on anatomically preserved mature cycadalean stems which have been recovered from the Pichaihue Limestones (Neuquén Basin, Patagonia, Argentina). The new species is characterized by the presence of a columnar stem with an armor of persistent leaf bases, vascular bundles displaying an omega pattern, the absence of cataphylls, a wide pith with medullary vascular bundles, mucilage canals and idioblasts, a polyxylic vascular cylinder, inverted xylem, and manoxylic wood. The presence of W. beatrizae sp. nov. in the Pichaihue Limestones suggests warm climate conditions during the early Palaeogene in the Neuquén Basin, and also extends the range of this genus of Cycadales (Encephalartoideae) into the Cenozoic. © 2018 Elsevier B.V.

Registro:

Documento: Artículo
Título:A new cycad trunk from the Palaeocene in the Neuquén Basin, Patagonia (Argentina)
Autor:Martínez, L.C.A.; Ottone, E.G.; Artabe, A.E.
Filiación:Instituto de Botánica Darwinion (CONICET-ANCEFN), Labarden 200, San Isidro, Buenos Aires B1642HYD, Argentina
Instituto de Estudios Andinos Don Pablo Groeber-CONICET, Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón n° 2, Ciudad Universitaria, Buenos Aires, C1428EHA, Argentina
Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Paseo del Bosque s/n, La Plata, B1900FWA, Argentina
Palabras clave:Anatomy; Cenozoic; Cycadales; Danian; South America; Systematics; anatomy; bark; Cenozoic; Danian; gymnosperm; new species; paleobotany; Paleogene; range expansion; taxonomy; Patagonia; Cycadales; Cycadopsida
Año:2018
Volumen:256
Página de inicio:1
Página de fin:12
DOI: http://dx.doi.org/10.1016/j.revpalbo.2018.05.006
Título revista:Review of Palaeobotany and Palynology
Título revista abreviado:Rev. Palaeobot. Palynol.
ISSN:00346667
CODEN:RPPYA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00346667_v256_n_p1_Martinez

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Citas:

---------- APA ----------
Martínez, L.C.A., Ottone, E.G. & Artabe, A.E. (2018) . A new cycad trunk from the Palaeocene in the Neuquén Basin, Patagonia (Argentina). Review of Palaeobotany and Palynology, 256, 1-12.
http://dx.doi.org/10.1016/j.revpalbo.2018.05.006
---------- CHICAGO ----------
Martínez, L.C.A., Ottone, E.G., Artabe, A.E. "A new cycad trunk from the Palaeocene in the Neuquén Basin, Patagonia (Argentina)" . Review of Palaeobotany and Palynology 256 (2018) : 1-12.
http://dx.doi.org/10.1016/j.revpalbo.2018.05.006
---------- MLA ----------
Martínez, L.C.A., Ottone, E.G., Artabe, A.E. "A new cycad trunk from the Palaeocene in the Neuquén Basin, Patagonia (Argentina)" . Review of Palaeobotany and Palynology, vol. 256, 2018, pp. 1-12.
http://dx.doi.org/10.1016/j.revpalbo.2018.05.006
---------- VANCOUVER ----------
Martínez, L.C.A., Ottone, E.G., Artabe, A.E. A new cycad trunk from the Palaeocene in the Neuquén Basin, Patagonia (Argentina). Rev. Palaeobot. Palynol. 2018;256:1-12.
http://dx.doi.org/10.1016/j.revpalbo.2018.05.006