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A Gram-stain-negative, aerobic, motile, ovoid-shaped and yellow-coloured strain, designated SYSU M79828^T, was isolated from seawater collected from the South China Sea. Growth of this strain was observed at 4–37 °C (optimum, 28 °C), pH 6.0–8.0 (optimum, pH 7.0) and with 0–6% NaCl (optimum, 3.0 %, w/v). The respiratory quinone was found to be Q-10. Major fatty acid constituents were C_18 : 1 ω7c/C_18 : 1 ω6c, C_18 : 1ω7c11-methyl and C_18 : 0 (>5 % of total). The major polar lipids were phosphatidylethanolamine, phosphatidylglycerol, diphosphatidylglycerol, phosphatidylcholine, phosphoglycolipid, two unidentified phospholipid, one unidentified lipid and an unidentified glycolipid. The genomic DNA G+C content was 64.5 mol%. Phylogenetic analyses based on 16S rRNA gene sequences and core genes indicated that strain SYSU M79828^T belonged to the genus Cereibacter and had …