Maribellus luteus gen. nov., sp. nov., a marine bacterium in the family Prolixibacteraceae isolated from coastal seawater.

A facultatively anaerobic, Gram-stain-negative, non-motile and straight to slightly curved long rod-shaped bacterial strain, designated XSD2T, was isolated from coastal seawater of Xiaoshi Island, PR China. The cells were catalase-positive, oxidase-negative and non-flagellated. Strain XSD2T was found to grow at 20-40 °C (optimum, 33 °C), at pH 6.0-8.5 (pH 7.0-7.5) and with 1-5 % (w/v) NaCl (3 %). Carotenoid pigments were produced. The major cellular fatty acids (>10.0 %) were iso-C15 : 0, iso-C16 : 0 3-OH and C17 : 1ω6c and the major polar lipids were phosphatidylethanolamine, one unidentified aminolipid and three unidentified polar lipids. The sole respiratory quinone was MK-7 and the genomic DNA G+C content was 44.1 mol%. The result of the 16S rRNA gene sequence analysis confirmed the affiliation of this organism to the order Marinilabiliales, family Prolixibacteraceae, with Mariniphaga sediminis SY21T as its closest relative with only 93.6 % sequence similarity. On the basis of physiological, biochemical and chemotaxonomic characteristics, we propose that strain XSD2T (=KCTC 62994T=MCCC 1H00347T) represents a novel species of a novel genus in the family Prolixibacteraceae, for which the name Maribellus luteus gen. nov., sp. nov. is proposed.