“Candidatus Intestinibacterium parameciiphilum”—member of the “Candidatus Paracaedibacteraceae” family (Alphaproteobacteria, Holosporales) inhabiting the ciliated protist Paramecium
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“Candidatus Intestinibacterium parameciiphilum”—member of the “Candidatus Paracaedibacteraceae” family (Alphaproteobacteria, Holosporales) inhabiting the ciliated protist Paramecium
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<jats:title>Abstract</jats:title><jats:p>Protists frequently host diverse bacterial symbionts, in particular those affiliated with the order <jats:italic>Holosporales</jats:italic> (<jats:italic>Alphaproteobacteria</jats:italic>). All characterised members of this bacterial lineage have been retrieved in obligate association with a wide range of eukaryotes, especially multiple protist lineages (e.g. amoebozoans, ciliates, cercozoans, euglenids, and nucleariids), as well as some metazoans (especially arthropods and related ecdysozoans). While the genus <jats:italic>Paramecium</jats:italic> and other ciliates have been deeply investigated for the presence of symbionts, known members of the family “<jats:italic>Candidatus</jats:italic> Paracaedibacteraceae” (<jats:italic>Holosporales</jats:italic>) are currently underrepresented in such hosts. Herein, we report the description of “<jats:italic>Candidatus</jats:italic> Intestinibacterium parameciiphilum” within the family “<jats:italic>Candidatus</jats:italic> Paracaedibacteraceae”, inhabiting the cytoplasm of <jats:italic>Paramecium biaurelia</jats:italic>. This novel bacterium is almost twice as big as its relative “<jats:italic>Candidatus </jats:italic>Intestinibacterium nucleariae” from the opisthokont <jats:italic>Nuclearia</jats:italic> and does not present a surrounding halo. Based on phylogenetic analyses of 16S rRNA gene sequences, we identified six further potential species-level lineages within the genus. Based on the provenance of the respective samples, we investigated the environmental distribution of the representatives of “<jats:italic>Candidatus</jats:italic> Intestinibacterium” species. Obtained results are consistent with an obligate endosymbiotic lifestyle, with protists, in particular freshwater ones, as hosts. Thus, available data suggest that association with freshwater protists could be the ancestral condition for the members of the “<jats:italic>Candidatus</jats:italic> Intestinibacterium” genus.</jats:p>