sp. nov., isolated from seawater on the Xiamen.

Strain 12-3 was isolated from seawater of the Guanyinshan Coast, Xiamen, Fujian Province, PR China. The bacterium was Gram-stain-negative, rod-shaped, aerobic, oxidase-positive and catalase-negative. Growth of strain 12-3 occurred at 10-37 °C (optimum, 20-30 °C), at pH 5.0-11.0 (optimum, pH 7.0-8.0) and at a salinity range of 0-10 % (optimum, 3-5 %). The results of phylogenetic analysis based on its 16S rRNA gene sequence indicated that strain 12-3 belonged to the genus and had the highest sequence similarity to HDM-25 (97.4 %), followed by SW-3 (96.9 %), MJ17 (96.9 %), F14 (96.8 %) and other species in the genus (95.3-96.5 %). The average nucleotide identity (ANI) and DNA-DNA hybridization (DDH) values between strain 12-3 and HDM-25 were 76.1 and 17.0 %, respectively. ANI and DDH values between strain 12-3 and SW-3 were 78.9 and 18.2 %, respectively. The principal fatty acid of strain 12-3 was summed feature 8 (C 6/7) and C. The respiratory quinone of strain 12-3 was Q10. The polar lipids included phosphatidylcholine, phosphatidylethanolamine, phosphatidylglycerol, diphosphatidylglycerol and an unidentified glycolipid. The G+C content of the chromosomal DNA was 63.9 mol%. The combination of the results of the phylogenetic, phenotypic and chemotaxonomic analyses, and its low ANI and DDH values indicate that strain 12-3 represents a novel species of the genus , for which the name sp. nov. is proposed. The type strain is 12-3 (=MCCC 1A16381=KCTC 72687).