A yellow, Gram-staining-positive, aerobic, rod-shaped and non-motile bacterial strain, designated CJ663T, was isolated from the tidal flat sediment in Ganghwa-do, South Korea. Strain CJ663T grew optimally on R2A at 30 °C and pH 7.0 and did not require NaCl for growth. Phylogenetic analysis based on 16S rRNA gene sequence similarity showed that strain CJ663T belonged to the genus Flavihumibacter within the family Chitinophagaceae and was most closely related to Flavihumibacter cheonanensis KACC 17467T (98.3 % similarity), followed by Flavihumibacter solisilvae KACC 17917T (97.4 %). DNA-DNA relatedness levels of strain CJ663T were 42.9 % to F. cheonanensis KACC 17467T and 48.6 % to F. solisilvae KACC 17917T. The major isoprenoid quinone was menaquinone 7 (MK-7). The predominant polar lipids were phosphatidylethanolamine, aminophospholipid and two unidentified lipids. The major cellular fatty acids of strain CJ663T were iso-C15 : 0, anteiso-C15 : 0 and iso-C17 : 0 3-OH. The G+C content of the genomic DNA was 47.7 mol%. On the basis of data from this polyphasic taxonomic study, strain CJ663T represents a novel species in the genus Flavihumibacter, for which name Flavihumibacter sediminis sp. nov. is proposed; the type strain is CJ663T (=KACC 18874T=JCM 31431T).
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