Colonial palynomorphs from the Upper Ordovician of north-eastern Iran: ‘thalli’, coenobial Chlorophyceae (Hydrodictyaceae) or cyanobacteria?
| Autor: | Borja Cascales-Miñana, Sylvie Régnier, Thomas Servais, Charles H. Wellman, Navid Navidi-Izad, Hossein Hashemi |
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| Přispěvatelé: | Évolution, Écologie et Paléontologie (Evo-Eco-Paleo) - UMR 8198 (Evo-Eco-Paléo), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Laboratoire de paléontologie et paleogéographie du paleozoique (LPPP), Université de Lille, Sciences et Technologies-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Évolution, Écologie et Paléontologie (Evo-Eco-Paleo) - UMR 8198 (Evo-Eco-Paléo (EEP)) |
| Rok vydání: | 2019 |
| Předmět: |
Cyanobacteria
010506 paleontology spores [SDE.MCG]Environmental Sciences/Global Changes Chlorophyceae Acritarch 010502 geochemistry & geophysics 01 natural sciences cyanobacteria Botany Hydrodictyaceae ComputingMilieux_MISCELLANEOUS 0105 earth and related environmental sciences [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere biology Paleontology biology.organism_classification green algae Katian Thallus Geography acritarchs [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology Ordovician Green algae [SDE.BE]Environmental Sciences/Biodiversity and Ecology land plants [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology |
| Zdroj: | Palynology Palynology, Taylor & Francis, 2020, 44 (4), pp.575-585. ⟨10.1080/01916122.2019.1657197⟩ Palynology, Taylor & Francis, 2019, pp.1-11. ⟨10.1080/01916122.2019.1657197⟩ Palynology, 2020, 44 (4), pp.575-585. ⟨10.1080/01916122.2019.1657197⟩ |
| ISSN: | 0191-6122 |
| DOI: | 10.6084/m9.figshare.9906710.v1 |
| Popis: | This study documents ‘colonial’ palynomorphs from the Upper Ordovician Ghelli Formation of north-eastern Iran. The aggregates of organic-walled microfossils come from the Katian Armoricochitina nigerica–Ancyrochitina merga chitinozoan biozones of this formation. The ‘colonial’ microfossils can be classified as acritarchs and/or cryptospores, but they cannot be attributed to a particular biological group. Some specimens resemble ‘thalli’ of putative spores, such as Grododowon orthogonalis Strother 2017. Other clusters may suggest an affinity to green algal groups, in particular to colonial chlorophyceaen algae, most probably belonging to Hydrodictyaceae. Some specimens also show morphological similarities with cyanobacterial groups. There is so far no evidence to relate these ‘colonial’ palynomorphs to primitive land plants, but we hypothesise that they were possibly produced by ancient green algal lineages with some kind of subaerial existence. |
| Databáze: | OpenAIRE |
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