The taxonomic characteristics of five bacterial strains which were isolated from Antarctic coastal marine environments were studied. These bacteria were psychrotrophic, aerobic, and gram negative with polar flagella. The G+C contents of the DNAs of these strains were 41 to 42 mol%. The Antarctic strains were phenotypically distinct from the previously described type species. DNA-DNA hybridization experiments revealed that the new strains were closely related to each other but clearly different from and , which were the most phenotypically similar organisms. None of the bacterial isolates was capable of using -malate, -sorbitol, or -hydroxybenzoate, and all were capable of gelatin hydrolysis. Strains NF2, NF3 (T = type strain), NF13, NF14, and EN10 had an Na requirement but required only 17 mM Na. Phenotypic, DNA G+C content, DNA-DNA hybridization, 16S rRNA analysis, fatty acid composition, and protein profile data confirmed the identification of the Antarctic strains as members of a sp. The name sp. nov. is proposed for these organisms.


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