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Two aerobic, Gram-stain-negative, pale-red-pigmented and rod-shaped bacterial strains, designated SAORIC-26 and SAORIC-28T, were isolated from seawater (3000 m depth) from the Pacific Ocean. Phylogenetic analysis based on their 16S rRNA gene sequences revealed that the novel isolates could be affiliated with the family Rhodothermaceae of the class Cytophagia . Strains SAORIC-26 and SAORIC-28T shared 99.7 % pairwise sequence similarity with each other and showed less than 92.6 % similarity with other cultivated members of the class Cytophagia . The strains were found to be non-motile, oxidase-positive, catalase-negative and able to hydrolyse gelatin and aesculin. The DNA G+C contents were determined to be 64.8–65.8 mol% and MK-7 was the predominant menaquinone. Summed feature 9 (iso-C17 : 1ω9c and/or C16 : 0 10-methyl), summed feature 3 (C16 : 1ω6c and/or C16 : 1ω7c) and iso-C15 : 0 were found to be the major cellular fatty acids. On the basis of this taxonomic study using a polyphasic approach, it was concluded that strains SAORIC-26 and SAORIC-28T represent a novel species of a new genus in the family Rhodothermaceae , for which the name Rubrivirga marina gen. nov., sp. nov. is proposed. The type strain of the type species of is SAORIC-28T ( = KCTC 23867T = NBRC 108816T). An additional strain of the species is SAORIC-26.
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