Two Gram-negative, aerobic, pale pink/rose-coloured, rod-shaped, non-motile bacterial strains, designated GFA-11 and RG-4, were isolated from a freshwater fish culture pond and a freshwater spring sample, respectively. Based on characterization by using a polyphasic approach, the two strains showed highly similar phenotypic, physiological and genetic characteristics. They shared 99.9 % 16S rRNA gene sequence similarity and 89–94 % DNA–DNA relatedness, suggesting that they represent a single genomic species. Phylogenetic analysis based on 16S rRNA gene sequences showed that strains GFA-11 and RG-4 formed a monophyletic branch at the periphery of the evolutionary radiation occupied by the genus within the family . Their closest neighbours were DSM 103 (97.7 % 16S rRNA gene sequence similarity) and CL-GP79 (95.9 %). Levels of DNA–DNA relatedness between the two novel strains and the type strains of and were less than 70 %. The results of physiological and biochemical tests allowed clear phenotypic differentiation of strains GFA-11 and RG-4 from recognized members of the genus . The predominant fatty acid constituents of strain GFA-11 were C 5 (40.2 % of the total) and iso-C (15.0 %). The DNA G+C content of strain GFA-11 was 39.7 mol%. On the basis of 16S rRNA gene sequence analysis and chemotaxonomic and physiological data, strains GFA-11 and RG-4 are considered to represent a novel species of the genus , for which the name sp. nov. is proposed. The type strain is GFA-11 (=BCRC 17834=LMG 24501).


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