Lycopodites (Lycopodiidae, Lycopodiales): un nuevo integrante de las floras triásicas de la Argentina

The record of Mesozoic lycophytes from Argentina is scarce, for this reason the finding of new samples is significant for the knowledge of the fossil biodiversity. In this contribution, stems of herbaceous lycophytes coming from Barreal Formation (Anisian, Middle Triassic, San Juan Province) and Pot...

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Detalles Bibliográficos
Autores principales: Beltrán, Marisol, Bodnar, Josefina, Coturel, Eliana Paula
Formato: Articulo
Lenguaje:Español
Publicado: 2018
Materias:
Paleontología
Herbaceous lycophytes
Mesozoic
Barreal Formation
Potrerillos Formation
Licofitas herbáceas
Mesozoico
Formación Barreal,
Formación Potrerillos
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/111300
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-111300
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Español
topic Paleontología
Herbaceous lycophytes
Mesozoic
Barreal Formation
Potrerillos Formation
Licofitas herbáceas
Mesozoico
Formación Barreal,
Formación Potrerillos
spellingShingle Paleontología
Herbaceous lycophytes
Mesozoic
Barreal Formation
Potrerillos Formation
Licofitas herbáceas
Mesozoico
Formación Barreal,
Formación Potrerillos
Beltrán, Marisol
Bodnar, Josefina
Coturel, Eliana Paula
Lycopodites (Lycopodiidae, Lycopodiales): un nuevo integrante de las floras triásicas de la Argentina
topic_facet Paleontología
Herbaceous lycophytes
Mesozoic
Barreal Formation
Potrerillos Formation
Licofitas herbáceas
Mesozoico
Formación Barreal,
Formación Potrerillos
description The record of Mesozoic lycophytes from Argentina is scarce, for this reason the finding of new samples is significant for the knowledge of the fossil biodiversity. In this contribution, stems of herbaceous lycophytes coming from Barreal Formation (Anisian, Middle Triassic, San Juan Province) and Potrerillos Formation (Carnian, Upper Triassic, Mendoza Province) are described. The fossil from Barreal is a fragment of a delicate dichotomous stem, covered by helically arranged microphylls, of which only the basal zone was preserved. The microphyll bases are rhomboidal, with straight to slightly concave margins, of uniform size, and have a central leaf scar of circular to ovate shape, inside of which the vascular bundle scar is observed. The Potrerillos specimen corresponds to a delicate dichotomous stem covered by isophyllous microphylls, elliptical, adpressed, helically arranged. Both samples are assigned to the genus Lycopodites due to their size, the type of phyllotaxis, the absence of ligule and the microphyll morphology, but they are not related to a species entity as a consequence of the scarce preserved material. Within the herbaceous lycophytes, the studied fossils show greater affinity to the Lycopodiales, since they exhibit isophyllous axes. This work constitutes the first description of the genus Lycopodites in Argentina and the first record for the Triassic of South America. Their occurrence would indicate high moisture local conditions, and would coincide with the regional paleoclimatic interpretations which propose a humidity increase in the lapses Anisian-early Ladinian and Carnian.
format Articulo
Articulo
author Beltrán, Marisol
Bodnar, Josefina
Coturel, Eliana Paula
author_facet Beltrán, Marisol
Bodnar, Josefina
Coturel, Eliana Paula
author_sort Beltrán, Marisol
title Lycopodites (Lycopodiidae, Lycopodiales): un nuevo integrante de las floras triásicas de la Argentina
title_short Lycopodites (Lycopodiidae, Lycopodiales): un nuevo integrante de las floras triásicas de la Argentina
title_full Lycopodites (Lycopodiidae, Lycopodiales): un nuevo integrante de las floras triásicas de la Argentina
title_fullStr Lycopodites (Lycopodiidae, Lycopodiales): un nuevo integrante de las floras triásicas de la Argentina
title_full_unstemmed Lycopodites (Lycopodiidae, Lycopodiales): un nuevo integrante de las floras triásicas de la Argentina
title_sort lycopodites (lycopodiidae, lycopodiales): un nuevo integrante de las floras triásicas de la argentina
publishDate 2018
url http://sedici.unlp.edu.ar/handle/10915/111300
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