A moderately thermophilic, anaerobic bacterium (strain SG 508) was isolated from a hydrothermal vent chimney located at 1 ° N on the East Pacific Rise at a depth of 2650 m. Cells of strain SG 508 were straight to slightly curved rods, 0.4–0.6 μm in diameter and 2.0–3.0 μm in length. Spore formation was observed only below pH 5.5. The temperature range for growth was 22–60 °C, with optimum growth at 50 °C. The pH range for growth was 4.0–8.5, with optimum growth at pH 6.0–6.8. Growth of strain SG 508 was observed at NaCl concentrations ranging from 1.0 to 6.0 % (w/v), with optimum growth at 2.5 % (w/v). Substrates utilized by strain SG 508 included casein, peptone, tryptone, yeast extract, beef extract, starch, maltose and glucose. The products of glucose fermentation were ethanol, acetate, H, formate and CO. Strain SG 508 was able to reduce elemental sulfur to hydrogen sulfide. The DNA G+C content of strain SG 508 was 30.9 mol%. 16S rRNA gene sequence analysis revealed that the isolated organism belonged to cluster I of the genus . On the basis of its physiological properties and data from phylogenetic analyses, strain SG 508 is considered to represent a novel species of the genus , for which the name sp. nov. is proposed. The type strain is SG 508 (=DSM 19306 =VKM B-2459).


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