Isolates of were obtained from various habitats by enrichment in a mineral medium, using molecular hydrogen as the hydrogen donor and nitrate as the hydrogen acceptor. A total of 11 strains were compared with the following three reference strains: Stanier 381 (type strain) (= DSM 65 = ATCC 17741), Morris (= DSM 413 = ATCC 19367), and Vogt (= DSM 415). A computer analysis based on 235 characters indicated that the strains clustered into subgroups. Deoxyribonucleic acid-deoxyribonucleic acid homology determinations confirmed this suggestion. A formal description of the species is presented, and the taxonomic position of is discussed.


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