A new Encephalarteae trunk (Cycadales) from the Cretaceous of Patagonia (Mata Amarilla Formation, Austral Basin), Argentina

The cycads are remnants of a flora that dominated the terrestrial ecosystems across the Mesozoic Era. The stem record of fossil cycads is scanty, with seventeen genera described around the world. From them, eight come from Argentina (Triassic to Paleogene strata), and actually six from the Cretaceou...

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Autores principales: Martínez, Leandro Carlos Alcides, Iglesias, Ari, Artabe, Analía Emilia Eva, Varela, Augusto Nicolás, Apesteguía, Sebastián
Formato: Articulo
Lenguaje:Inglés
Publicado: 2017
Materias:
Paleontología
Anatomy
Argentina
Cycadales
Fossils
Patagonia
South America
Systematics
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/128182
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-128182
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Paleontología
Anatomy
Argentina
Cycadales
Fossils
Patagonia
South America
Systematics
spellingShingle Paleontología
Anatomy
Argentina
Cycadales
Fossils
Patagonia
South America
Systematics
Martínez, Leandro Carlos Alcides
Iglesias, Ari
Artabe, Analía Emilia Eva
Varela, Augusto Nicolás
Apesteguía, Sebastián
A new Encephalarteae trunk (Cycadales) from the Cretaceous of Patagonia (Mata Amarilla Formation, Austral Basin), Argentina
topic_facet Paleontología
Anatomy
Argentina
Cycadales
Fossils
Patagonia
South America
Systematics
description The cycads are remnants of a flora that dominated the terrestrial ecosystems across the Mesozoic Era. The stem record of fossil cycads is scanty, with seventeen genera described around the world. From them, eight come from Argentina (Triassic to Paleogene strata), and actually six from the Cretaceous of Patagonia. In this research, we present a new fossil trunk of cycad from Upper Cretaceous beds of Patagonia. The good preservation of the permineralized stem allows to make detailed descriptions and comparisons and, accordingly, support the erection of a new taxon, Zamuneria amyla gen. et sp. nov. This new taxon possesses characters that fit with the Encephalarteae (e.g., columnar stem with persistent leaf bases and cataphylls, a wide pith, medullary vascular bundles, mucilage canals and idioblasts, a polyxylic vascular cylinder). Some features present in Zamuneria are discussed, such as the great development of parenchyma tissues with a marked amount of specialized cells (idioblasts), probably related with some protective function. Furthermore, the presence of cycads during the deposition of the Mata Amarilla Formation allows inferring climatic conditions, as well as a greater diversity of Encephalarteae in South America reinforces the endemic conditions for this group for the Cretaceous of southern continents.
format Articulo
Articulo
author Martínez, Leandro Carlos Alcides
Iglesias, Ari
Artabe, Analía Emilia Eva
Varela, Augusto Nicolás
Apesteguía, Sebastián
author_facet Martínez, Leandro Carlos Alcides
Iglesias, Ari
Artabe, Analía Emilia Eva
Varela, Augusto Nicolás
Apesteguía, Sebastián
author_sort Martínez, Leandro Carlos Alcides
title A new Encephalarteae trunk (Cycadales) from the Cretaceous of Patagonia (Mata Amarilla Formation, Austral Basin), Argentina
title_short A new Encephalarteae trunk (Cycadales) from the Cretaceous of Patagonia (Mata Amarilla Formation, Austral Basin), Argentina
title_full A new Encephalarteae trunk (Cycadales) from the Cretaceous of Patagonia (Mata Amarilla Formation, Austral Basin), Argentina
title_fullStr A new Encephalarteae trunk (Cycadales) from the Cretaceous of Patagonia (Mata Amarilla Formation, Austral Basin), Argentina
title_full_unstemmed A new Encephalarteae trunk (Cycadales) from the Cretaceous of Patagonia (Mata Amarilla Formation, Austral Basin), Argentina
title_sort new encephalarteae trunk (cycadales) from the cretaceous of patagonia (mata amarilla formation, austral basin), argentina
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/128182
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