A strictly anaerobic, moderately halophilic, gram-negative, rod-shaped bacterium was isolated from Great Salt Lake, Utah, sediments and designated GSLS(T = type strain). Strain GSLSgrew optimally at pH 6.7 to 7.0 but had a very broad pH range for growth (pH 5.8 to 10.0). The optimum temperature for growth was 37°C, and no growth occurred at 15 or 55°C. The optimum salt concentration for growth was 10%. Strain GSLSrequired yeast extract and Trypticase peptone to ferment carbohydrates, pyruvate, and glycine betaine. Strain GSLSwas resistant to penicillin, -cycloserine, tetracycline, and streptomycin. The G+C content of this isolate was 31 mol%. The fermentation products from glucose utilization were acetate, butyrate, lactate, CO, and H, and in addition strain GSLSfermented glycine betaine to acetate and trimethylamine. All of these traits distinguish this organism from all previously described halophilic anaerobes. The 16S rRNA gene sequence of strain GSLSwas found to be similar to, but also significantly different from, the 16S rRNA sequences of and . Therefore, strain GSLS(= DSM 8275) is described as a new species, .


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