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-C_{15: 1} G, iso-C_{15: 0} and iso-C_{17: 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.