A novel Gram-stain-negative bacterium, designated strain BH-SD17(T), was isolated from a marine sediment sample in the Bohai Gulf, Yellow Sea, China. Cells of strain BH-SD17(T) are aerobic, yellow-colored, non-flagellated rods. Growth occurs between 15 and 40 degrees C (optimum, 30 degrees C), at pH 6.0-8.5 (optimum, 7.5) and with 1.0-8.0% (w/v) NaCl (optimum, 3.0%). Strain BH-SD17(T) contains phosphatidylethanolamine and two unidentified lipids as the major polar lipids. The predominant fatty acids are iso-C-15:0 (28.5%), iso-C-15:1 G (24.4%), and iso-C-17:0 3-OH (12.3%). The major respiratory quinone is MK-6. Strain BH-SD17(T) shows moderate 16S rRNA gene sequence similarity to existing identified strains, is most closely related to the genera Lutimonas (92.1-92.4%), Lutibacter (91.6-92.3%), and Taeania (91.9%). Phylogenetic trees based on 16S rRNA gene sequences show that strain BH-SD17(T) forms a distinct lineage within the family Flavobacteriaceae. Based on the results of phenotypic, chemotaxonomic and phylogenetic analysis, strain BH-SD17(T) is considered to represent a novel genus and species in the family Flavobacteriaceae, for which the name Aureibaculum marinum is proposed. The type strain is BH-SD17(T) (=CCTCC AB 2017072(T)=KCTC 62204(T)).