Reconstruction and phylogenetic significance of a new Equisetum linnaeus species from the Lower Jurassic of Cerro Bayo (Chubut Province, Argentina)

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-lik...

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Autores principales:	Cúneo, Nestor Rubén, Ottone, Eduardo Guillermo
Publicado:	2015
Materias:	Equisetales Equisetum Jurassic Patagonia Systematic matrix morphology phylogenetics reconstruction vascular plant Aisen Argentina Cerro Bayo Chile Chubut Equisetites
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027014_v52_n1_p135_Elgorriaga http://hdl.handle.net/20.500.12110/paper_00027014_v52_n1_p135_Elgorriaga
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00027014_v52_n1_p135_Elgorriaga
record_format	dspace
spelling	paper:paper_00027014_v52_n1_p135_Elgorriaga2023-06-08T14:22:29Z Reconstruction and phylogenetic significance of a new Equisetum linnaeus species from the Lower Jurassic of Cerro Bayo (Chubut Province, Argentina) Cúneo, Nestor Rubén Ottone, Eduardo Guillermo Equisetales Equisetum Jurassic Patagonia Systematic Jurassic matrix morphology phylogenetics reconstruction vascular plant Aisen Argentina Cerro Bayo Chile Chubut Patagonia Equisetales Equisetites Equisetum 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. Fil:Cúneo, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Ottone, E.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027014_v52_n1_p135_Elgorriaga http://hdl.handle.net/20.500.12110/paper_00027014_v52_n1_p135_Elgorriaga
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Equisetales Equisetum Jurassic Patagonia Systematic Jurassic matrix morphology phylogenetics reconstruction vascular plant Aisen Argentina Cerro Bayo Chile Chubut Patagonia Equisetales Equisetites Equisetum
spellingShingle	Equisetales Equisetum Jurassic Patagonia Systematic Jurassic matrix morphology phylogenetics reconstruction vascular plant Aisen Argentina Cerro Bayo Chile Chubut Patagonia Equisetales Equisetites Equisetum Cúneo, Nestor Rubén Ottone, Eduardo Guillermo Reconstruction and phylogenetic significance of a new Equisetum linnaeus species from the Lower Jurassic of Cerro Bayo (Chubut Province, Argentina)
topic_facet	Equisetales Equisetum Jurassic Patagonia Systematic Jurassic matrix morphology phylogenetics reconstruction vascular plant Aisen Argentina Cerro Bayo Chile Chubut Patagonia Equisetales Equisetites Equisetum
description	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.
author	Cúneo, Nestor Rubén Ottone, Eduardo Guillermo
author_facet	Cúneo, Nestor Rubén Ottone, Eduardo Guillermo
author_sort	Cúneo, Nestor Rubén
title	Reconstruction and phylogenetic significance of a new Equisetum linnaeus species from the Lower Jurassic of Cerro Bayo (Chubut Province, Argentina)
title_short	Reconstruction and phylogenetic significance of a new Equisetum linnaeus species from the Lower Jurassic of Cerro Bayo (Chubut Province, Argentina)
title_full	Reconstruction and phylogenetic significance of a new Equisetum linnaeus species from the Lower Jurassic of Cerro Bayo (Chubut Province, Argentina)
title_fullStr	Reconstruction and phylogenetic significance of a new Equisetum linnaeus species from the Lower Jurassic of Cerro Bayo (Chubut Province, Argentina)
title_full_unstemmed	Reconstruction and phylogenetic significance of a new Equisetum linnaeus species from the Lower Jurassic of Cerro Bayo (Chubut Province, Argentina)
title_sort	reconstruction and phylogenetic significance of a new equisetum linnaeus species from the lower jurassic of cerro bayo (chubut province, argentina)
publishDate	2015
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027014_v52_n1_p135_Elgorriaga http://hdl.handle.net/20.500.12110/paper_00027014_v52_n1_p135_Elgorriaga
work_keys_str_mv	AT cuneonestorruben reconstructionandphylogeneticsignificanceofanewequisetumlinnaeusspeciesfromthelowerjurassicofcerrobayochubutprovinceargentina AT ottoneeduardoguillermo reconstructionandphylogeneticsignificanceofanewequisetumlinnaeusspeciesfromthelowerjurassicofcerrobayochubutprovinceargentina
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Reconstruction and phylogenetic significance of a new Equisetum linnaeus species from the Lower Jurassic of Cerro Bayo (Chubut Province, Argentina)

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