A new gram-positive bacterium was isolated from activated sludge acclimated with sugar-containing synthetic wastewater. This organism, designated strain Y-104 (T = type strain), was a coccus-shaped, aerobic chemoorganotroph that had a strictly respiratory type of metabolism with oxygen as the terminal electron acceptor. This strain accumulates large amounts of polysaccharide in its cells. Strain Y-104 has the following chemotaxonomic characteristics: it contains menaquinone MK-8(H), its DNA G+C content is 67.5 mol%, and it contains -diaminopimelic acid. No previously described high-G+C-content gram-positive coccus contains both MK-8(H) as a major quinone and -diaminopimelic acid in its cell wall. A phylogenetic analysis based on 16S rRNA sequences showed that strain Y-104 represents a line of descent distinct from those of previously described species of high-G+C-content gram-positive bacteria and that members of the genus are the nearest neighbors. Therefore, we concluded that our isolate should be assigned to a new genus and species, for which we propose the name . The type strain is strain Y-104.


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