Pseudofulvibacter geojedonensis gen. nov., sp. nov., a polysaccharide-degrading member of the family Flavobacteriaceae isolated from seawater, and emended description of the genus Fulvibacter.

A Gram-negative, non-spore-forming, aerobic, non-flagellated, non-gliding rod, designated YCS-9(T), was isolated from seawater in the South Sea, South Korea. Strain YCS-9(T) grew optimally at 25 °C, at pH 7.0-8.0 and in the presence of 2 % (w/v) NaCl. In the neighbour-joining phylogenetic tree based on 16S rRNA gene sequences, strain YCS-9(T) fell within the family Flavobacteriaceae and formed a cluster with Fulvibacter tottoriensis MTT-39(T) with a bootstrap resampling value of 75.4 %. Strain YCS-9(T) showed 92.3 % 16S rRNA gene sequence similarity to F. tottoriensis MTT-39(T) and 89.0-93.7 % sequence similarity to the other strains used in the phylogenetic analysis. Strain YCS-9(T) contained MK-6 as the only menaquinone and iso-C15 : 1 G, iso-C15 : 0 and iso-C17 : 0 3-OH as the major fatty acids. The major polar lipids were one unidentified lipid and one unidentified aminolipid. The DNA G+C content was 34.2 mol%. Strain YCS-9(T) could be differentiated from F. tottoriensis NBRC 102624(T) by differences in fatty acid composition, polar lipid profile and some phenotypic properties. On the basis of phenotypic, chemotaxonomic and phylogenetic data, strain YCS-9(T) represents a novel species in a new genus within the phylum Bacteroidetes, for which the name Pseudofulvibacter geojedonensis gen. nov., sp. nov. is proposed. The type strain of Pseudofulvibacter geojedonensis is YCS-9(T) ( = KCTC 23884(T)  = CCUG 62114(T)). An emended description of the genus Fulvibacter is also presented.