NDLI: Eoguptioxylon antiqua gen. et sp. nov. (Pteridospermae) del Pérmico Superior (Formación La Antigua), provincia de La Rioja, Argentina

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Eoguptioxylon antiqua gen. et sp. nov. (Pteridospermae) del Pérmico Superior (Formación La Antigua), provincia de La Rioja, Argentina

Content Provider	Semantic Scholar
Author	Crisafulli, Alexandra María Lutz, Alicia Isabel
Copyright Year	2007
Abstract	Resumen. Se describen fragmentos de maderas pteridospermicas poliestelicas provenientes de la Formacion La Antigua (Permico Superior) aflorante en la provincia de La Rioja. Se trata de un nuevo taxon con estelas dispuestas irregularmente en el parenquima fundamental. Las estelas estan rodeadas por tejido esclerenquimatico. Cada una ha preservado una medula central diafragmada, con lagunas, xilema primario y secundario. El nuevo genero es comparado con taxones que muestran caracteristicas anatomicas semejantes, especialmente carboniferas-permicas como las Medullosales (Medullosa) y jurasicas como las Pentoxylales (Pentoxylon, Nipanioxylon) e incertaesedis como el genero Guptioxylon. Otros caracteres anatomicos como el xilema secundario picnoxilico con punteaduras uniseriadas y biseriadas, campos de cruzamiento con punteaduras araucarioides y el tipo de radios lenosos son equivalentes con aquellos de las Coniferales. Del analisis surge que Guptioxylon registrado en Rajmahal Hills (India), es el genero con mayores afinidades al aqui descripto. Sin embargo, los ejemplares estudiados no pueden ser asignados al mismo taxon por presentar diferencias en caracteres de la medula y el xilema secundario, salida y conformacion de las trazas, asi como la ausencia de una peculiar peridermis en forma de X, presente en la medula de Guptioxylon. Consecuentemente se propone un nuevo genero y especie para albergar a esta nueva Pteridosperma del Permico Superior de Argentina: Eoguptioxylon antiqua gen. et sp. nov. Abstract. EOGUPTIOXYLON ANTIQUA GEN. ET SP. NOV. (PTERIDOSPERMAE) FROM THE UPPER PERMIAN (LA ANTIGUA FORMATION), LA RIOJA PROVINCE, ARGENTINA. A polystelic pteridosperm wood with steles irregularly disposed in ground parenchyma from the Upper Permian La Antigua Formation (La Rioja province) is described. The steles are surrounded by sclerenchymatic tissue. Each stele has preserved a central diaphragm pith with lacunes, primary and secondary xylem. The taxon is compared with Carboniferous-Permian Medullosales (Medullosa), Jurassic Pentoxylales (Pentoxylon, Nipanioxylon) and the incertaesedis genus Guptioxylon. Other anatomical characteristics, like picnoxylic secondary wood with uni- to biseriate pits, araucarioid cross-fields and the type of rays are shared with Coniferales. The genus described herein mostly resembles Guptioxylon from the Rajmahal Hills (India). However, the studied specimens cannot be adscribed to this taxon because of marked differences in the pith and the secondary xylem, departure and conformation traces, and the absence of a X-shaped peculiar periderm. Consequently a new genus and species are proposed to include this new Pteridosperm from the Upper Permian of Argentina: Eoguptioxylon antiqua gen. et sp. nov.
Starting Page	197
Ending Page	204
Page Count	8
File Format	PDF HTM / HTML
Volume Number	44
Alternate Webpage(s)	http://www.ameghiniana.org.ar/index.php/ameghiniana/article/download/684/1421
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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