Colonial palynomorphs from the Upper Ordovician of north-eastern Iran: ‘thalli’, coenobial Chlorophyceae (Hydrodictyaceae) or cyanobacteria? - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Palynology Année : 2020

Colonial palynomorphs from the Upper Ordovician of north-eastern Iran: ‘thalli’, coenobial Chlorophyceae (Hydrodictyaceae) or cyanobacteria?

Navid Navidi-Izad
  • Fonction : Auteur
Hossein Hashemi
  • Fonction : Auteur
Borja Cascales-Miñana
Sylvie Régnier
  • Fonction : Auteur
Charles Wellman
  • Fonction : Auteur

Résumé

This study documents 'colonial' palynomorphs from the Upper Ordovician Ghelli Formation of northeastern Iran. The aggregates of organic-walled microfossils come from the Katian Armoricochitina nigerica and Ancyrochitina merga chitinozoan Biozones of this formation. They 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 suggest an affinity to green algal groups, in particular with colonial chlorophyceaen algae, most probably of Hydrodictyaceae. Some specimens also show affinities with cyanobacterial groups. There are no arguments to relate these colonial palynomorphs to primitive land plants, but they are possibly produced by ancient green algal lineages that may have been experimenting with a subaerial existence.
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hal-03046697 , version 1 (18-12-2020)

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Navid Navidi-Izad, Hossein Hashemi, Borja Cascales-Miñana, Sylvie Régnier, Charles Wellman, et al.. Colonial palynomorphs from the Upper Ordovician of north-eastern Iran: ‘thalli’, coenobial Chlorophyceae (Hydrodictyaceae) or cyanobacteria?. Palynology, 2020, 44 (4), pp.575-585. ⟨10.1080/01916122.2019.1657197⟩. ⟨hal-03046697⟩
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