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A Gram-stain-negative, facultatively anaerobic, rod-shaped, non-flagellated and non-gliding bacterium, designated strain B011^T, was isolated from marine algae Gracilaria blodgettii collected from the coast of Lingshui county, Hainan, China. Phylogenetic analysis of 16S rRNA gene sequences revealed that strain B011^T, Seonamhaeicola algicola (96.8 % 16S rRNA gene sequence similarity) and Seonamhaeicola aphaedonensis (95.0 %) belonged to the same clade. Optimal growth occurred in the presence of 3.0 % (w/v) NaCl, at pH 6.5–7.5 and at 28 °C. Menaquinone-6 (MK-6) was the predominant respiratory quinone. The major fatty acids (>10 %) were iso-C_15 : 1 G (23.4 %) and iso-C_15 : 0 (22.8 %). The major polar lipids were phosphatidylethanolamine, one aminolipid and three unknown lipids. The DNA G+C content of strain B011^T was 33.9 mol%. On the basis of polyphasic analysis …