A Gram-negative bacterium, designated strain EMB117 T , was isolated from a municipal wastewater treatment plant and characterized by polyphasic taxonomy. The cells were non-spore-forming rods that showed gliding motility. Optimal growth occurred at 25-30 6C and pH 7.0-8.0. Strain EMB117 T contained phosphatidylethanolamine as the predominant polar lipid, and the major fatty acids were iso-C 15 : 0 , iso-C 17 : 0 3-OH, iso-C 15 : 0 3-OH and summed feature 3 (C 16 : 1 v7c and/or iso-C 15 : 0 2-OH). The G+C content of the genomic DNA was 33.5 mol% and the major isoprenoid quinone was MK-6. A phylogenetic analysis based on 16S rRNA gene sequences showed that strain EMB117 T belonged to the genus Flavobacterium and was most closely related to Flavobacterium johnsoniae DSM 425 T (97.8 % sequence similarity). The DNA-DNA relatedness between strain EMB117 T and F. johnsoniae ATCC 17061 T was about 18 %. On the basis of the phenotypic, chemotaxonomic and molecular data, strain EMB117 T represents a novel species within the genus Flavobacterium, for which the name Flavobacterium defluvii sp. nov. is proposed. The type strain is EMB117 T (=KCTC 12612 T =DSM 17963 T ).
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