Fossil pollen with affinity to Alismataceae, Palo Pintado formation, Miocene of Argentina.
This study describes fossil pollen with affinity to the Alismataceae family (Echinodorus, Helanthium and Sagittaria genera) from the Miocene Palo Pintado Formation in northwestern Argentina. Two species assigned to the genus Punctioratipollis (P. sp.1 and P. sp. 2) display morphological features lin...
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| Autores principales: | , , |
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| Formato: | Artículo revista |
| Lenguaje: | Español |
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Facultad de Ciencias Exactas y Naturales y Agrimensura
2025
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| Acceso en línea: | https://revistas.unne.edu.ar/index.php/fce/article/view/8845 |
| Aporte de: |
| Sumario: | This study describes fossil pollen with affinity to the Alismataceae family (Echinodorus, Helanthium and Sagittaria genera) from the Miocene Palo Pintado Formation in northwestern Argentina. Two species assigned to the genus Punctioratipollis (P. sp.1 and P. sp. 2) display morphological features linking them to Echinodorus and Sagittaria, representing the first palynological records of these taxa in the Neogene of Argentina. Their presence, alongside macrofossils previously attributed to Sagittaria, suggests the development of freshwater aquatic and/or marsh vegetation in floodplain settings with anastomosing river systems. Comparative analyses with extant species show notable similarities in aperture characteristics and exine ornamentation, thus supporting their assignment to Alismataceae. These findings strengthen the hypothesis of a South American origin for Echinodorus and Sagittaria, followed by dispersal events toward North America, consistent with molecular data and macrofossil evidence. Overall, this work enhances our understanding of the paleofloristic diversity in the Palo Pintado Formation and contributes to broader insights into the evolution of aquatic plant communities in southern latitudes during the Miocene. |
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