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Abstract:

We describe Equisetum dimorphum sp. nov. from the Lower Jurassic of Chubut Province, Patagonia, Argentina. This new species is based on fertile and vegetative remains preserved as impressions of stems, leaves, strobili, transversal sections of the stems showing their anatomy, and terminal pagoda-like structures. The fine-grained sedimentary matrix also preserved detailed impressions of epidermal features. The morphological characters allow a whole-plant reconstruction and assignment to Equisetum. Equisetum dimorphum sp. nov. shows a mosaic of morphological characters that are commonly present in other Mesozoic forms and representatives of the two extant Equisetum subgenera, e.g., sunken stomata and a blunt strobilus apex. Compared to other well-known Mesozoic equisetalean taxa, Equisetum dimorphum sp. nov. appears to be most closely related to a group of Jurassic Equisetum-like plants including Equisetum laterale Phillips and Equisetites ferganensis Seward. Additional evidence for the morphological stasis of the fertile and vegetative organs of extant horsetails is supplied with this new material, adding further support to the hypothesis that the extant horsetails are a successful group that has undergone only little morphological changeover time and that has been present, nearly worldwide, since Jurassic times.

Registro:

Documento: Artículo
Título:Reconstruction and phylogenetic significance of a new Equisetum linnaeus species from the Lower Jurassic of Cerro Bayo (Chubut Province, Argentina)
Autor:Elgorriaga, A.; Escapa, I.H.; Bomfleur, B.; Cúneo, R.; Ottone, E.G.
Filiación:Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón no 2, Ciudad Universitaria, Buenos Aires, C1428EHA, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas, Museo Paleontológico Egidio Feruglio, Avenida Fontana 140, Chubut, U9100GYO, Argentina
Department of Palaeobiology, Swedish Museum of Natural History, P.O. Box 50007, Stockholm, SE-104 05, Sweden
Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón no 2, Ciudad Universitaria, Buenos Aires, C1428EHA, Argentina
Palabras clave:Equisetales; Equisetum; Jurassic; Patagonia; Systematic; Jurassic; matrix; morphology; phylogenetics; reconstruction; vascular plant; Aisen; Argentina; Cerro Bayo; Chile; Chubut; Patagonia; Equisetales; Equisetites; Equisetum
Año:2015
Volumen:52
Número:1
Página de inicio:135
Página de fin:152
DOI: http://dx.doi.org/10.5710/AMGH.15.09.2014.2758
Título revista:Ameghiniana
Título revista abreviado:Ameghiniana
ISSN:00027014
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027014_v52_n1_p135_Elgorriaga

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Citas:

---------- APA ----------
Elgorriaga, A., Escapa, I.H., Bomfleur, B., Cúneo, R. & Ottone, E.G. (2015) . Reconstruction and phylogenetic significance of a new Equisetum linnaeus species from the Lower Jurassic of Cerro Bayo (Chubut Province, Argentina). Ameghiniana, 52(1), 135-152.
http://dx.doi.org/10.5710/AMGH.15.09.2014.2758
---------- CHICAGO ----------
Elgorriaga, A., Escapa, I.H., Bomfleur, B., Cúneo, R., Ottone, E.G. "Reconstruction and phylogenetic significance of a new Equisetum linnaeus species from the Lower Jurassic of Cerro Bayo (Chubut Province, Argentina)" . Ameghiniana 52, no. 1 (2015) : 135-152.
http://dx.doi.org/10.5710/AMGH.15.09.2014.2758
---------- MLA ----------
Elgorriaga, A., Escapa, I.H., Bomfleur, B., Cúneo, R., Ottone, E.G. "Reconstruction and phylogenetic significance of a new Equisetum linnaeus species from the Lower Jurassic of Cerro Bayo (Chubut Province, Argentina)" . Ameghiniana, vol. 52, no. 1, 2015, pp. 135-152.
http://dx.doi.org/10.5710/AMGH.15.09.2014.2758
---------- VANCOUVER ----------
Elgorriaga, A., Escapa, I.H., Bomfleur, B., Cúneo, R., Ottone, E.G. Reconstruction and phylogenetic significance of a new Equisetum linnaeus species from the Lower Jurassic of Cerro Bayo (Chubut Province, Argentina). Ameghiniana. 2015;52(1):135-152.
http://dx.doi.org/10.5710/AMGH.15.09.2014.2758