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A novel marine bacterium isolated from the intestine of cultured flounder (Paralichthys olivaceus) was studied by using a polyphasic taxonomic approach. The isolate was Gram-stain-negative, pleomorphic, aerobic, yellow and oxidase- and catalase-negative. Phylogenetic analysis of 16S rRNA gene sequences indicated that isolate Th6T formed a distinct branch within the family Flavobacteriaceae and showed 96.6 % similarity to its closest relative, Bizionia hallyeonensis T-y7T. The DNA G+C content was 29 mol%. The major respiratory quinone was MK-6. The predominant fatty acids were iso-C15 : 1 G, iso-C15 : 0, iso-C15 : 0 3-OH, iso-C17 : 0 3-OH and summed feature 3 (C15 : 1ω6c and/or C16 : 1ω7c). On the basis of the phenotypic, chemotaxonomic and phylogenetic characteristics, the novel bacterium has been assigned to a novel species of a new genus for which the name Ichthyenterobacterium magnum gen. nov., sp. nov. is proposed. The type strain is Th6T ( = JCM 18636T = KCTC 32140T).
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