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A novel Colwellia-like bacterial strain, SMK-10T, was isolated from a tidal flat sediment in Korea and subjected to a polyphasic taxonomic analysis. Cells of strain SMK-10T were Gram-negative, motile, greyish yellow-pigmented, curved rods. Optimal growth occurred at 25–30 °C and in the presence of 2–3 % (w/v) NaCl. Strain SMK-10T contained Q-8 as the predominant ubiquinone and C16 : 1 ω7c and/or iso-C15 : 0 2-OH, C17 : 1, C15 : 1 and iso-C16 : 0 as major fatty acids. The DNA G+C content was 39·3 mol%. Phylogenetic trees based on 16S rRNA gene sequence analysis showed that strain SMK-10T belonged to the genus Colwellia. 16S rRNA gene sequence similarity values (94·7–96·7 %) to the type strains of all other Colwellia species and various differential phenotypic properties were sufficient to distinguish strain SMK-10T from recognized Colwellia species. On the basis of its phenotypic properties and phylogenetic distinctiveness, strain SMK-10T (=KCTC 12480T=DSM 17314T) is classified as the type strain of a novel Colwellia species, for which the name Colwellia aestuarii sp. nov. is proposed.
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