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Discocelia Plataet Sp. n., a Small Incertae Sedis Cercozoan Flagellate
Kristina Prokina1,2, Guifré Torruella1,3, Luis Javier Galindo1,4,5
1Ecologie Société et Evolution, CNRS, AgroParisTech, Université Paris-Saclay, Gif-sur-Yvette, France.
The Journal of Eukaryotic Microbiology
|August 25, 2025
Summary
This study sequences transcriptomes of three gliding monadofilosan strains, revealing new insights into Cercozoa phylogeny and the novel species Discocelia plataet. This advances our understanding of microbial diversity and evolution.
Area of Science:
- Protistology
- Microbial Phylogenetics
- Marine Biology
Background:
- Cercozoa (Filosa, SAR) is a large, diverse rhizarian group vital to microbial food webs.
- Cercozoan phylogeny is poorly resolved by SSU rRNA gene analysis, with limited omics data.
- Environmental sequencing indicates abundance in soils and deep marine sediments.
Purpose of the Study:
- To resolve the phylogeny of Cercozoa by sequencing transcriptomes of three new gliding monadofilosan strains.
- To perform detailed morphological characterization of a novel discocelid strain (GT001).
- To investigate the evolutionary context of the order Discocelida.
Main Methods:
- Transcriptome sequencing of three monadofilosan strains (RAM19S6, CRO19P5, GT001).
- Light and electron microscopy for morphological characterization of strain GT001.
- Transmission electron microscopy and expansion microscopy to study the flagellar apparatus.
Main Results:
- Sequenced transcriptomes of glissomonad RAM19S6, marimonad CRO19P5, and discocelid GT001.
- Described a new species, Discocelia plataet sp. n., with unique features like discoidal mitochondrial cristae and an acronema.
- Identified cercozoan microtubular root homologies and detailed discocelid cell structure.
Conclusions:
- The study provides new data for resolving Cercozoa phylogeny within Monadofilosa.
- The detailed characterization of Discocelia plataet enhances knowledge of discocelid diversity and evolution.
- This research contributes to understanding the evolutionary history of the order Discocelida.
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