sp. nov., a marine bacterium isolated from coastal seawater.

A Gram-straining-negative, facultatively anaerobic, motile by means of a polar flagellum and rod-shaped marine bacterium, designated S4M6, was isolated from surface seawater collected in Dongshan Bay (Fujian, PR China). Phylogenetic analysis based on 16S rRNA genes, phylogenomic analysis of single-copy gene families and whole genome data indicated that S4M6 represented a member of the genus . The closest phylogenetic relatives of S4M6 were CGMCC 1.8994 (97.8 % 16S rRNA gene sequence pairwise similarity), LMG 25438 (96.9 %), SZDIS-1 (96.2 %) and M22 (96.1 %). The growth of S4M6 occurred at 15-35 °C (optimum 28 °C), pH 4.0-9.0 (optimum 5.0-7.0) and in the presence of 2-5 % (w/v) NaCl (optimum 3 %). The predominant fatty acids (>10 %) are C, summed feature 3 (Cω7 and/or C  ω6c) and summed feature 8 (Cω7 and/or C  ω6). The DNA G+C content of the assembled genomic sequences was 43.4 % for S4M6. Average nucleotide identity (ANI) values between S4M6 and the reference species were lower than the threshold for species delineation (95-96 %); DNA-DNA hybridization further indicated that S4M6 had less than 70 % similarity to its relatives. On the basis of the polyphasic evidence, strain S4M6 is proposed to represent a novel species of the genus , for which the name sp. nov. is proposed. The type strain is S4M6 (= KCTC 92312= MCCC 1K06167).