A new extremely halophilic chemoorganotrophic bacterium (strain H200 [T = type strain]) was isolated from the hypersaline sediments of Retba Lake in Senegal. This organism was a sluggishly motile, rod-shaped, non-spore-forming, gram-negative, obligate anaerobe that grew optimally at 40°C in the presence of 180 to 200 g of NaCl per liter. The DNA base composition was 32 mol% guanine plus cytosine. The fermentation products from glucose were ethanol, acetate, H, and CO. Yeast extract was required for growth. The fermentable substrates included d-fructose, galactose, d-xylose, cellobiose, lactose, maltose, sucrose, starch, d-mannitol, glycerol, and Casamino Acids. On the basis of the results of a 16S rRNA sequence analysis, strain H200 was found to be related to species. The 16S rRNA sequence of strain H200 differed from the sequences of the three previously described species, and strain H200 also differed from these organisms in its NaCl range for growth (60 to 340 g/liter); strain H200 grew in the presence of the highest NaCl concentration recorded for any halophilic anaerobic organism, including the three previously described species. We propose that strain H200 (= DSM 10165) belongs to a new species, .


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