We describe a new species of the genus for four nitrite-producing strains which were isolated from experimental biofilters that had been supplied with ammonia. The whole cells of these strains contain -diaminopimelic acid, ribose, madurose, glucose, and galactose. The polar lipids include diphosphatidylglycerol, phosphatidylinositol, and phosphatidylinositol mannosides. The main menaquinone is MK-9(H). The fatty acids include hexadecanoic acid and 10-methyloctadecanoic acid. The guanine-plus-cytosine content of the DNA is 74 mol%. The fatty acid composition, morphology, and physiological reaction profiles of these strains differentiate them from previously described species. The name proposed for the new species is .


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