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An extremely halophilic archaeon, strain ETD6, was isolated from a marine solar saltern in Sfax, Tunisia. Analysis of the 16S rRNA gene sequence showed that the isolate was phylogenetically related to species of the genus  Halorubrum  among the family  Halobacteriaceae , with a close relationship to  Hrr. xinjiangense  (99.77% of identity). However, value for DNA-DNA hybridization between strain ETD6 and  Hrr.xinjiangense  were about 24.5%. The G+C content of the genomic DNA was 65.1 mol% (T(m)). Strain ETD6 grew in 15–35% (w/v) NaCl. The temperature and pH ranges for growth were 20–55°C and 6–9, respectively. Optimal growth occurred at 25% NaCl, 37°C, and pH 7.4. The results of the DNA hybridization against  Hrr. xinjiangense  and physiological and biochemical tests allowed genotypic and phenotypic differentiation of strain ETD6 from other  Hrr.  species. Therefore, strain ETD6 represents a novel species of the genus  Halorubrum , for which the name  Hrr. sfaxense  sp. nov. is proposed. The Genbank EMBL-EBI accession number is GU724599.

Characterization ofHalorubrum sfaxensesp. nov., a New Halophilic Archaeon Isolated from the Solar Saltern of Sfax in Tunisia