A new taxon for Dipteridaceae fronds from the Paso Flores formation, late Triassic, Neuquén basin, Argentina
Sterile and fertile fronds of dipteridacean ferns from the Paso Flores Formation (Norian) at Cañadón de Pancho area (Neuquén Basin, Argentina) are described. The morphological characteristics are: fan-shaped fronds dissected in two equal and opposite rachial arms; each rachial arm bearing more t...
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| Formato: | Reunión |
| Lenguaje: | Inglés |
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Asociación Paleontológica Argentina
2024
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| Acceso en línea: | http://repositorio.unne.edu.ar/handle/123456789/54557 |
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I48-R184-123456789-545572025-03-06T11:53:39Z A new taxon for Dipteridaceae fronds from the Paso Flores formation, late Triassic, Neuquén basin, Argentina Gnaedinger, Silvia Cristina Zavattieri, Ana María Dipteridaceae Formación Paso Flores Neuquén (Argentina) Sterile and fertile fronds of dipteridacean ferns from the Paso Flores Formation (Norian) at Cañadón de Pancho area (Neuquén Basin, Argentina) are described. The morphological characteristics are: fan-shaped fronds dissected in two equal and opposite rachial arms; each rachial arm bearing more than 18 primary segments. The primary segments fused up to 1/3 of the total length of the preserved lamina, and the remaining part is free, linear-lanceolate in shape, showing ondulate to deeply dissected lobes margins (less than 2/3 in length of the secondary vein). Primary and secondary veins are simple, whereas tertiary veins dichotomized and forming irregularly polygonal areoles. Sori are exindusiate, arranged in two regular rows on either side of the primary veins, as well as on both sides of the base of the secondary veins. They are round in outline; each sorus consists of 45-60 or more sporangia. The annulus of the sporangia is oblique and complete. These specimens share some morphological features of the fronds with the fossil genera Clathropteris, Digitopteris, Thaumatopteris and, with some species of the Dictyophyllum as well as in the soral features with one of the current species of Dipteris. The Paso Flores specimens comprise an interesting mixture and unique combination of features that differ from any of the known and most abundant genera of Dipteridaceae. Thus, these dipterid fossil fern fronds suggest that they belong to a new taxonomic entity. 2024-07-27T14:16:50Z 2024-07-27T14:16:50Z 2020-11 Reunión Gnaedinger, Silvia Cristina y Zavattieri, Ana María, 2020. A new taxon for Dipteridaceae fronds from the Paso Flores formation, late Triassic, Neuquén basin, Argentina. En: 1° Reunión Virtual de Comunicaciones de la Asociación Paleontológica Argentina. Buenos Aires: Asociación Paleontológica Argentina, p. 21-21. 2469-0228 http://repositorio.unne.edu.ar/handle/123456789/54557 eng openAccess http://creativecommons.org/licenses/by-nc-nd/2.5/ar/ application/pdf p. 21-21 application/pdf Asociación Paleontológica Argentina |
| institution |
Universidad Nacional del Nordeste |
| institution_str |
I-48 |
| repository_str |
R-184 |
| collection |
RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE) |
| language |
Inglés |
| topic |
Dipteridaceae Formación Paso Flores Neuquén (Argentina) |
| spellingShingle |
Dipteridaceae Formación Paso Flores Neuquén (Argentina) Gnaedinger, Silvia Cristina Zavattieri, Ana María A new taxon for Dipteridaceae fronds from the Paso Flores formation, late Triassic, Neuquén basin, Argentina |
| topic_facet |
Dipteridaceae Formación Paso Flores Neuquén (Argentina) |
| description |
Sterile and fertile fronds of dipteridacean ferns from the Paso Flores Formation (Norian) at Cañadón de Pancho area
(Neuquén Basin, Argentina) are described. The morphological characteristics are: fan-shaped fronds dissected in two equal
and opposite rachial arms; each rachial arm bearing more than 18 primary segments. The primary segments fused up to
1/3 of the total length of the preserved lamina, and the remaining part is free, linear-lanceolate in shape, showing ondulate
to deeply dissected lobes margins (less than 2/3 in length of the secondary vein). Primary and secondary veins are simple,
whereas tertiary veins dichotomized and forming irregularly polygonal areoles. Sori are exindusiate, arranged in two regular
rows on either side of the primary veins, as well as on both sides of the base of the secondary veins. They are round in
outline; each sorus consists of 45-60 or more sporangia. The annulus of the sporangia is oblique and complete. These
specimens share some morphological features of the fronds with the fossil genera Clathropteris, Digitopteris, Thaumatopteris
and, with some species of the Dictyophyllum as well as in the soral features with one of the current species of Dipteris. The
Paso Flores specimens comprise an interesting mixture and unique combination of features that differ from any of the
known and most abundant genera of Dipteridaceae. Thus, these dipterid fossil fern fronds suggest that they belong to a
new taxonomic entity. |
| format |
Reunión |
| author |
Gnaedinger, Silvia Cristina Zavattieri, Ana María |
| author_facet |
Gnaedinger, Silvia Cristina Zavattieri, Ana María |
| author_sort |
Gnaedinger, Silvia Cristina |
| title |
A new taxon for Dipteridaceae fronds from the Paso Flores formation, late Triassic, Neuquén basin, Argentina |
| title_short |
A new taxon for Dipteridaceae fronds from the Paso Flores formation, late Triassic, Neuquén basin, Argentina |
| title_full |
A new taxon for Dipteridaceae fronds from the Paso Flores formation, late Triassic, Neuquén basin, Argentina |
| title_fullStr |
A new taxon for Dipteridaceae fronds from the Paso Flores formation, late Triassic, Neuquén basin, Argentina |
| title_full_unstemmed |
A new taxon for Dipteridaceae fronds from the Paso Flores formation, late Triassic, Neuquén basin, Argentina |
| title_sort |
new taxon for dipteridaceae fronds from the paso flores formation, late triassic, neuquén basin, argentina |
| publisher |
Asociación Paleontológica Argentina |
| publishDate |
2024 |
| url |
http://repositorio.unne.edu.ar/handle/123456789/54557 |
| work_keys_str_mv |
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| _version_ |
1832346207507185664 |