A new cycad stem from the Cretaceous in Argentina and its phylogenetic relationships with other Cycadales

Autores
Martínez, Leandro Carlos Alcides; Artabe, Analía Emilia Eva; Bodnar, Josefina
Año de publicación
2012
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The cycads are an ancient group of seed plants. Fossil stems assigned to the Cycadales are, however, rare and few descriptions of them exist. Here, a new genus of cycad stem, Wintucycas gen. nov., is described on the basis of specimens found in the Allen Formation (Upper Cretaceous) at the Salitral Ojo de Agua locality, Río Negro Province, Argentina. The most remarkable features of Wintucyas are: a columnar stem with persistent leaf bases, absence of cataphylls, a wide pith, medullary vascular bundles, mucilage canals and idioblasts; a polyxylic vascular cylinder; inverted xylem; and manoxylic wood. The new genus was included in a phylogenetic analysis and its relationships with fossil and extant genera of Cycadales were examined. In the resulting phylogenetic hypothesis, Wintucycas is circumscribed to subfamily Encephalartoideae, supporting the existence of a greater diversity of this group in South America during the Cretaceous.
Facultad de Ciencias Naturales y Museo
Materia
Ciencias Naturales
Allen Formation
Anatomy
Neuquén Basin
Patagonia
Phylogeny
South America
Systematics
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/84000
Acceder
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network_name_str SEDICI (UNLP)
spelling A new cycad stem from the Cretaceous in Argentina and its phylogenetic relationships with other CycadalesMartínez, Leandro Carlos AlcidesArtabe, Analía Emilia EvaBodnar, JosefinaCiencias NaturalesAllen FormationAnatomyNeuquén BasinPatagoniaPhylogenySouth AmericaSystematicsThe cycads are an ancient group of seed plants. Fossil stems assigned to the Cycadales are, however, rare and few descriptions of them exist. Here, a new genus of cycad stem, Wintucycas gen. nov., is described on the basis of specimens found in the Allen Formation (Upper Cretaceous) at the Salitral Ojo de Agua locality, Río Negro Province, Argentina. The most remarkable features of Wintucyas are: a columnar stem with persistent leaf bases, absence of cataphylls, a wide pith, medullary vascular bundles, mucilage canals and idioblasts; a polyxylic vascular cylinder; inverted xylem; and manoxylic wood. The new genus was included in a phylogenetic analysis and its relationships with fossil and extant genera of Cycadales were examined. In the resulting phylogenetic hypothesis, Wintucycas is circumscribed to subfamily Encephalartoideae, supporting the existence of a greater diversity of this group in South America during the Cretaceous.Facultad de Ciencias Naturales y Museo2012info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf436-458http://sedici.unlp.edu.ar/handle/10915/84000enginfo:eu-repo/semantics/altIdentifier/issn/0024-4074info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1095-8339.2012.01300.xinfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-10-15T11:07:56Zoai:sedici.unlp.edu.ar:10915/84000Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-10-15 11:07:57.063SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv A new cycad stem from the Cretaceous in Argentina and its phylogenetic relationships with other Cycadales
title A new cycad stem from the Cretaceous in Argentina and its phylogenetic relationships with other Cycadales
spellingShingle A new cycad stem from the Cretaceous in Argentina and its phylogenetic relationships with other Cycadales
Martínez, Leandro Carlos Alcides
Ciencias Naturales
Allen Formation
Anatomy
Neuquén Basin
Patagonia
Phylogeny
South America
Systematics
title_short A new cycad stem from the Cretaceous in Argentina and its phylogenetic relationships with other Cycadales
title_full A new cycad stem from the Cretaceous in Argentina and its phylogenetic relationships with other Cycadales
title_fullStr A new cycad stem from the Cretaceous in Argentina and its phylogenetic relationships with other Cycadales
title_full_unstemmed A new cycad stem from the Cretaceous in Argentina and its phylogenetic relationships with other Cycadales
title_sort A new cycad stem from the Cretaceous in Argentina and its phylogenetic relationships with other Cycadales
dc.creator.none.fl_str_mv Martínez, Leandro Carlos Alcides
Artabe, Analía Emilia Eva
Bodnar, Josefina
author Martínez, Leandro Carlos Alcides
author_facet Martínez, Leandro Carlos Alcides
Artabe, Analía Emilia Eva
Bodnar, Josefina
author_role author
author2 Artabe, Analía Emilia Eva
Bodnar, Josefina
author2_role author
author
dc.subject.none.fl_str_mv Ciencias Naturales
Allen Formation
Anatomy
Neuquén Basin
Patagonia
Phylogeny
South America
Systematics
topic Ciencias Naturales
Allen Formation
Anatomy
Neuquén Basin
Patagonia
Phylogeny
South America
Systematics
dc.description.none.fl_txt_mv The cycads are an ancient group of seed plants. Fossil stems assigned to the Cycadales are, however, rare and few descriptions of them exist. Here, a new genus of cycad stem, Wintucycas gen. nov., is described on the basis of specimens found in the Allen Formation (Upper Cretaceous) at the Salitral Ojo de Agua locality, Río Negro Province, Argentina. The most remarkable features of Wintucyas are: a columnar stem with persistent leaf bases, absence of cataphylls, a wide pith, medullary vascular bundles, mucilage canals and idioblasts; a polyxylic vascular cylinder; inverted xylem; and manoxylic wood. The new genus was included in a phylogenetic analysis and its relationships with fossil and extant genera of Cycadales were examined. In the resulting phylogenetic hypothesis, Wintucycas is circumscribed to subfamily Encephalartoideae, supporting the existence of a greater diversity of this group in South America during the Cretaceous.
Facultad de Ciencias Naturales y Museo
description The cycads are an ancient group of seed plants. Fossil stems assigned to the Cycadales are, however, rare and few descriptions of them exist. Here, a new genus of cycad stem, Wintucycas gen. nov., is described on the basis of specimens found in the Allen Formation (Upper Cretaceous) at the Salitral Ojo de Agua locality, Río Negro Province, Argentina. The most remarkable features of Wintucyas are: a columnar stem with persistent leaf bases, absence of cataphylls, a wide pith, medullary vascular bundles, mucilage canals and idioblasts; a polyxylic vascular cylinder; inverted xylem; and manoxylic wood. The new genus was included in a phylogenetic analysis and its relationships with fossil and extant genera of Cycadales were examined. In the resulting phylogenetic hypothesis, Wintucycas is circumscribed to subfamily Encephalartoideae, supporting the existence of a greater diversity of this group in South America during the Cretaceous.
publishDate 2012
dc.date.none.fl_str_mv 2012
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/84000
url http://sedici.unlp.edu.ar/handle/10915/84000
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0024-4074
info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1095-8339.2012.01300.x
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
436-458
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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score 13.221938

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