TRANQUILOXYLON PETRIELLAI NOV. GEN. ET SP. (PTERIDOSPERMALES) FROM THE UPPER TRIASSIC LAGUNA COLORADA FORMATION, SANTA CRUZ PROVINCE, ARGENTINA

Authors

  • Rafael Herbst CIPAL-CICTERRA-UNC
  • Alicia Lutz

Abstract

The stem of a new genus and species, Tranquiloxylon petriellai with pteridospenn affinities, from the Upper Triassic of Patagonia is described. It is characterized by a parenchymatous pith with cells with dark contents surrounded by a continuous ring of primary xylern; the eccentric pycnoxylic wood is composed of closely packed wedge-shaped sections of secondary xylem with well marked growth rings, separated by vertical radial parenchymatic rays. The xylern bears uniseriate araucarioid borde red pits. Complex leaf-trace fonning structures are also described. This stem is compared with the Triassic Rhexoxylon, the Pennian Antarcticoxylon both from the Gondwana realm, and with Hermanophyton from the American Jurassic.

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Published

2014-02-01

Issue

Vol. 32 No. 3

Section

Articles

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How to Cite

TRANQUILOXYLON PETRIELLAI NOV. GEN. ET SP. (PTERIDOSPERMALES) FROM THE UPPER TRIASSIC LAGUNA COLORADA FORMATION, SANTA CRUZ PROVINCE, ARGENTINA. (2014). Ameghiniana, 32(3), 231-236. https://ameghiniana.org.ar/index.php/ameghiniana/article/view/2274

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