Spiribacter curvatus sp. nov., a moderately halophilic bacterium isolated from a saltern

Int J Syst Evol Microbiol. 2015 Dec;65(12):4638-4643. doi: 10.1099/ijsem.0.000621.


A novel pink-pigmented bacterial strain, UAH-SP71T, was isolated from a saltern located in Santa Pola, Alicante (Spain) and the complete genome sequence was analysed and compared with that of Spiribacter salinus M19-40T, suggesting that the two strains constituted two separate species, with a 77.3% ANI value. In this paper, strain UAH-SP71T was investigated in a taxonomic study using a polyphasic approach. Strain UAH-SP71T was a Gram-stain-negative, strictly aerobic, non-motile curved rod that grew in media containing 5-20% (w/v) NaCl (optimum 10% NaCl), at 5-40 °C (optimum 37 °C) and at pH 5-10 (optimum pH 8). Phylogenetic analysis based on the comparison of 16S rRNA gene sequences revealed thatstrain UAH-SP71T is a member of the genus Spiribacter, showing a sequence similarity of 96.5% with Spiribacter salinus M19-40T. Other related species are also members of the family Ectothiorhodospiraceae, including Arhodomonas recens RS91T (95.5% 16S rRNA gene sequence similarity), Arhodomonas aquaeolei ATCC 49307T (95.4 %) and Alkalilimnicola ehrlichii MLHE-1T (94.9 %). DNA-DNA hybridization between strain UAH-SP71T and Spiribacter salinus M19-40T was 39 %. The major cellular fatty acids of strain UAH-SP71T were C18 : 1ω6c and/or C18 : 1ω7c, C16 : 0, C16 : 1ω6c and/or C16 : 1ω7c, C10 : 0 3-OH and C12 : 0, a pattern similar to that of Spiribacter salinus M19-40T. Phylogenetic, phenotypic and genotypic differences between strain UAH-SP71T and Spiribacter salinus M19-40T indicate that strainUAH-SP71T represents a novel species of the genus Spiribacter, for which the name Spiribacter curvatus sp. nov. is proposed. The type strain is UAH-SP71T (5CECT8396T5DSM 28542T).

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Base Composition
  • DNA, Bacterial / genetics
  • Ectothiorhodospiraceae / classification*
  • Ectothiorhodospiraceae / genetics
  • Ectothiorhodospiraceae / isolation & purification
  • Fatty Acids / chemistry
  • Molecular Sequence Data
  • Nucleic Acid Hybridization
  • Phylogeny*
  • Pigmentation
  • RNA, Ribosomal, 16S / genetics
  • Salinity*
  • Sequence Analysis, DNA
  • Spain
  • Water Microbiology*


  • DNA, Bacterial
  • Fatty Acids
  • RNA, Ribosomal, 16S