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A novel hyperthermophilic, acidophilic and facultatively anaerobic archaeon, strain KD-1 T , was isolated from an acidic hot spring in Indonesia and characterized with the phylogenetically related species Sulfurisphaera ohwakuensis Kurosawa et al. 1998, Sulfolobus tokodaii Suzuki et al., 2002 and Sulfolobus yangmingensis Jan et al. 1999. Cells of KD-1 T were irregular cocci with diameters of 0.9-1.3 µm. The strain grew at 60-90 °C (optimum 80-85 °C), pH 2.5-6.0 (optimum pH 3.5-4.0) and 0-1.0 % (w/v) NaCl concentration. KD-1 T grew anaerobically in the presence of S 0 (headspace: H2/CO2) and FeCl3 (headspace: N2). Under aerobic conditions, chemolithoautotrophic growth occurred on S 0 , pyrite, K2S4O6, Na2S2O3 and H2. This strain utilized various complex substrates, such as yeast extract, but did not grow on sugars and amino acids as the sole carbon source. The main core lipids were calditoglycerocaldarchaeol and caldarchaeol. The DNA G+C content was 30.6 mol%. Analyses of phylogenetic trees based on 16S rRNA and 23S rRNA genes indicated that KD-1 T formed an independent lineage near Sulfurisphaera ohwakuensis TA-1 T , Sulfolobus tokodaii 7 T and Sulfolobus yangmingensis YM1 T . On the basis of the results of morphological, physiological, chemotaxonomic and phylogenetic analyses, KD-1 T represents a novel species of the genus Sulfurisphaera Kurosawa et al. 1998, for which the name Sulfurisphaera javensis sp. nov. is proposed. The type strain is KD-1 T (=JCM 32117 T =InaCC Ar81 T ). Based on the data, we also propose the reclassification of Sulfolobus tokodaii Suzuki et al., 2002 as Sulfurisphaera tokodaii comb. nov. (type strain 7 T =JCM 10545 T =DSM 16993 T ).

international journal of systematic and evolutionary microbiology

Sulfurisphaera javensis sp. nov., a hyperthermophilic and acidophilic archaeon isolated from Indonesian hot spring, and reclassification of Sulfolobus tokodaii Suzuki et al. 2002 as Sulfurisphaera tokodaii comb. nov.