Molecular and morphological characterisation of four new ancyromonad genera and proposal for an updated taxonomy of the Ancyromonadida - Archive ouverte HAL Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2023

Molecular and morphological characterisation of four new ancyromonad genera and proposal for an updated taxonomy of the Ancyromonadida

Guifré Torruella
Ken-Ichiro Ishida
  • Fonction : Auteur
Jazmin Blaz
David Moreira
Laura Eme

Résumé

Ancyromonads are small biflagellated protists with a bean-shaped morphology. They are cosmopolitan in marine, freshwater and soil environments, where they attach to surfaces while feeding on bacteria. These poorly known grazers stand out by their uncertain phylogenetic position in the tree of eukaryotes, forming a deep-branching 'orphan' lineage that is considered key to better understanding the early evolution of eukaryotes. Despite their ecological and evolutionary interest, only limited knowledge exists about their true diversity. Here, we aimed to better characterise ancyromonads by integrating environmental surveys with behavioural observation and description of cell morphology, for which sample isolation and culturing is indispensable. We studied 18 ancyromonad strains, including 14 new isolates and 7 new species. Most of them belong to three new and genetically divergent genera: Caraotamonas, Nyramonas, and Olneymonas (encompassing 4 species). The remaining three new species belong to the already known genera Fabomonas and Ancyromonas. We also raised Striomonas, formerly a subgenus of Nutomonas, to full genus status, based on morphological and phylogenetic grounds. For all these new species, we studied their morphology under light and electron microscopy and carried out molecular phylogenetic analyses, including as well 18S rRNA gene sequences from several environmental surveys. Based on these analyses, we have updated the taxonomy of Ancyromonadida.
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Dates et versions

hal-04289805 , version 1 (16-11-2023)

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Naoji Yubuki, Guifré Torruella, Luis Javier Galindo, Aaron A Heiss, Maria Cristina Ciobanu, et al.. Molecular and morphological characterisation of four new ancyromonad genera and proposal for an updated taxonomy of the Ancyromonadida. 2023. ⟨hal-04289805⟩
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