Strains of sp. nov. were isolated from the hot springs within the Geysir geothermal area of Iceland. The strains of produce red-orange-pigmented colonies, have an optimum growth temperature of about 55°C, and have higher levels of 3-OH fatty acids than the strains of the other species of the genus . These strains, unlike all other strains of the species of the genus examined previously, require cysteine, thiosulfate, or thioglycolate for growth in liquid medium, but not in the corresponding medium solidified with agar. Several strains belonging to , isolated from Geysir, also required reduced sulfur compounds for growth in liquid medium, leading to the hypothesis that this requirement is not a taxonomic characteristic of the new species. The new species represented by strains GY-1 and GY-5 can be distinguished from the other species of the genus by biochemical characteristics, fatty acid composition, DNA-DNA reassociation values, and 16S ribosomal DNA sequence. The type strain for is GY-1 (= DSM 11376).


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