“Candidatus Sonnebornia yantaiensis”, a member of candidate division OD1, as intracellular bacteria of the ciliated protist Paramecium bursaria (Ciliophora, Oligohymenophorea)
Keywords: Bacterial symbiont; Digestion-resistant bacteria; Endosymbiont; FISH; OD1; OD1-p; Protozoa; Rare biosphere; Sonnebornia; SSU rRNA;