A Gram-positive, extremely halotolerant bacterium was isolated from the Great Salt Lake, Utah, USA. The strain, designated NN(= DSM 11805), was strictly aerobic, rod-shaped, motile by peritrichous flagella and spore-forming. Strain NNgrew at salinities of 0-20% (w/v) NaCl. A distinctive feature of strain NNwas its optimal growth in salt-free medium. The polar lipid pattern of strain NNconsisted of phosphatidyl glycerol, diphosphatidyl glycerol and two phospholipids of unknown structure. The G+C content of its DNA was 38 mol%. The morphological, physiological and, particularly, the 16S rDNA sequence data, showed that strain NNwas associated with ‘ group 1’. However, the organisms showing the greatest degree of sequence similarity to strain NNwere members of the genus and the species and . On the basis of chemotaxonomic data, strain NNwas shown to be chemically most similar to and , with the greatest degree of similarity being shown to the latter organism. This was consistent with the 16S rDNA sequence data. Members of the genus comprise a chemically distinct group and can easily be distinguished from all other organisms of ‘ group 1’. On the basis of the 16S rDNA data, chemotaxonomy and the physiology of strain NN, it is proposed that this organism is a member of a new species, within a new genus, for which the name is proposed. It is also proposed that be transferred to this genus as comb. nov. and that be transferred to the genus gen. nov., as comb. nov. Finally, additional data is provided to support the transfer of to the genus , as Heyndrickx et al. (1998).


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