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

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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...

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Autores principales:	Martínez, Leandro Carlos Alcides, Artabe, Analía Emilia Eva, Bodnar, Josefina
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2012
Materias:	Ciencias Naturales Allen Formation Anatomy Neuquén Basin Patagonia Phylogeny South America Systematics
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/84000
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

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record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Ciencias Naturales Allen Formation Anatomy Neuquén Basin Patagonia Phylogeny South America Systematics
spellingShingle	Ciencias Naturales Allen Formation Anatomy Neuquén Basin Patagonia Phylogeny South America Systematics Martínez, Leandro Carlos Alcides Artabe, Analía Emilia Eva Bodnar, Josefina A new cycad stem from the Cretaceous in Argentina and its phylogenetic relationships with other Cycadales
topic_facet	Ciencias Naturales Allen Formation Anatomy Neuquén Basin Patagonia Phylogeny South America Systematics
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.
format	Articulo Articulo
author	Martínez, Leandro Carlos Alcides Artabe, Analía Emilia Eva Bodnar, Josefina
author_facet	Martínez, Leandro Carlos Alcides Artabe, Analía Emilia Eva Bodnar, Josefina
author_sort	Martínez, Leandro Carlos Alcides
title	A new cycad stem from the Cretaceous in Argentina and its phylogenetic relationships with other Cycadales
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	new cycad stem from the cretaceous in argentina and its phylogenetic relationships with other cycadales
publishDate	2012
url	http://sedici.unlp.edu.ar/handle/10915/84000
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A new cycad stem from the Cretaceous in Argentina and its phylogenetic relationships with other Cycadales

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