A novel microbe was isolated from a geothermal vent in Yang-Ming National Park in northern Taiwan. This spherical microbe with mean cell diameter of 1·1·0·2 μm is a facultatively chemolithoautotrophic archaeon that grows on elemental sulfur and reduced sulfur compounds. The optimal pH and temperature for growth are 4·0 (pH range 2·0-6·0) and 80 °C (temperature range 65-95 °C). Its membranes contain the lipids calditoglycerocaldarchaeol and caldarchaeol, which are common to other members of the . Like and , the new isolate utilizes sugars and amino acids effectively as sole carbon sources. The G+C content of the genomic DNA was 42 mol%. DNA of the isolate hybridized weakly to the DNA of other species. Phylogenetic analysis of the 16S rRNA indicated that the new isolate represents a deep branch within the genus . On the basis of these properties, the new isolate appears to represent a new species of , for which the name sp. nov. is proposed. The type strain is strain YM1.


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