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.

Published

2014-02-01

How to Cite

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

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