Helical organisms with novel ultrastructural characteristics were isolated from the intestinal mucosa of rats and mice. These bacteria were characterized by the presence of 9 to 11 periplasmic fibers which appeared as concentric helical ridges on the surface of each cell. The cells were motile with a rapid corkscrewlike motion and had bipolar tufts of 10 to 14 sheathed flagella. The bacteria were microaerophilic, nutritionally fastidious, and physiologically similar to species and but could be differentiated from these organisms by their unique cellular ultrastructure. Using 16S rRNA sequencing, we found that strain ST1 (T = type strain) was related to previously described species, “,” and . The closest relatives of strain ST1 were and “” (average similarity value, 96%). On the basis of phylogenetic data, strain ST1 (= ATCC 49282) represents a new species of the genus , for which we propose the name .


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