A thermophilic, strictly anaerobic, sulfur-reducing epsilonproteobacterium (strain AmH) isolated from deep-sea hydrothermal vents is described. Cells were motile, Gram-negative rods. Growth was observed at 30–55 °C, pH 6.0–9.0 and 2–5 % (w/v) NaCl. Chemolithoautotrophic growth occurred with molecular hydrogen or formate as the electron donor and elemental sulfur as the electron acceptor, producing hydrogen sulfide. Heterotrophic and mixotrophic growth occurred with formate as a source of carbon. The dominant phospholipid fatty acids were C 7 (73.26 % of the total), C 7 (12.70 %) and C (12.27 %). The genomic DNA G+C content was 33.5 mol%. Phylogenetic analysis based on 16S rRNA gene sequences placed strain AmH within the family of the . DNA–DNA hybridization experiments between strain AmH and DSM 13520 revealed a level of relatedness of 34.6 % between the two strains. Based on physiological and phylogenetic characteristics, strain AmH is considered to represent a novel species of the genus , for which the name sp. nov. is proposed. The type strain is AmH (=ATCC BAA-1463 =DSM 18972).


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vol. , part 7, pp. 1598 - 1602

Specific growth rate of strain AmH ( sp. nov.) at varying temperatures, pH and NaCl concentrations. [PDF](20 KB)


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