New species of osmundaceous fertile leaves from the upper Triassic of Argentina
| 1 | División Paleobotánica, Museo de La Plata, Facultad de Ciencias Naturales y Museo, Universidad Nacional de la Plata, Paseo del Bosque s/n, B1900FWA La Plata, Buenos Aires, Argentina |
| 2 | Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina |
| 3 | Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CIC), Argentina |
Online publication date: 2018-12-24
Publication date: 2018-12-24
Acta Palaeobotanica 2018; 58(2): 107–119
KEYWORDS
ABSTRACT
A new species of Osmundopsis Harris is described based on several impression-compression fossils from the upper section of the Potrerillos Formation (Uspallata Group) at Cerro Cacheuta Hill, Mendoza Province, Argentina. Osmundopsis
zunigai sp. nov. is characterized by having fertile pinnae with a slender striate rachis, bearing widely separate, opposite to subopposite short falcate pinnules with an entire margin, rounded apex, and a partially reduced lamina. The pinnules bear sporangia loosely disposed in clusters of four or five on the abaxial side. The sporangia are wedge- to heart-shaped, shortly stalked, with cells of the apical region thickened, and have a vertical dehiscence slit. The spores are trilete and laevigate. This is the first record of Osmundopsis in the Triassic of Argentina. The mutual occurrence or co-preservation of Osmundopsis zunigai sp. nov. with sterile fronds of Cladophlebis kurtzi suggests the possibility that these species formed part of a dimorphic bipinnate frond. The diversity and geographic extent of fertile leaves of the Osmunda lineage in the early Late Triassic, with records in South Africa and Antarctica and now with this new taxon, support the idea of a moist mesothermal climatic belt in southern Gondwana.
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CITATIONS (3):
1.
New plant fossil records and biostratigraphic analysis from the Uspallata Group (Late Triassic) at Cacheuta Hill, Cuyo Basin, west-central Argentina
Josefina Bodnar, Eduardo Morel, Eliana Coturel, Daniel Ganuza
Geobios
Josefina Bodnar, Eduardo Morel, Eliana Coturel, Daniel Ganuza
Geobios
2.
Triassic paleoclimate and paleofloristic trends of southwestern Gondwana (Argentina)
Tomás Pedernera, Adriana Mancuso, Eduardo Ottone
Journal of South American Earth Sciences
Tomás Pedernera, Adriana Mancuso, Eduardo Ottone
Journal of South American Earth Sciences
3.
Paleoenvironmental and Biotic Changes in the Late Triassic of Argentina: Testing Hypotheses of Abiotic Forcing at the Basin Scale
Adriana Mancuso, Randall Irmis, Tomás Pedernera, Leandro Gaetano, Cecilia Benavente, III Breeden
Frontiers in Earth Science
Adriana Mancuso, Randall Irmis, Tomás Pedernera, Leandro Gaetano, Cecilia Benavente, III Breeden
Frontiers in Earth Science
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