Oceaniradius stylonematis gen. nov., sp. nov., isolated from a red alga, Stylonema cornu-cervi

A Gram-stain-negative, strictly aerobic bacterium, designated StC1^T, was isolated from a marine alga, Stylonema cornu-cervi, in the Republic of Korea. Cells were oxidase- and catalase-positive rods that were motile by a single lateral flagellum. Growth of strain StC1^T was observed at 30-45 °C(optimum, 37 °C), pH 6.0-11.0 (pH 7.0) and in the presence of 1.0-8.0 % (w/v) NaCl (2 %). Strain StC1^T contained summed feature 8 (comprising C18 : 1ω7c/C18 : 1 ω6c) and 11-methyl-C18 : 1ω7c as the major fatty acids. Sulfoquinovosyl diacylglycerol, phosphatidylethanolamine and phosphatidylglycerol and ubiquinone-10 were identified as the major polar lipids and the sole isoprenoid quinone, respectively. The G+C content of the genomic DNA was 64.7 mol%. Strain StC1^T was most closely related to Oricola cellulosilytica CC-AMH-O^T, Nitratireductor basaltis J3^T, Aquamicrobiumahrensii 905/1^T and Mesorhizobium tamadayense Ala-3^T with 97.3 , 96.9 , 96.8  and 96.6 % 16S rRNA gene sequence similarities, respectively, but it formed a distinct phylogenic lineage within the family Phyllobacteriaceae. On the basis of phenotypic, chemotaxonomic and molecular properties, strain StC1^T represents a novel genus of the family Phyllobacteriaceae, for which the name Oceaniradius stylonematis gen. nov., sp. nov. is proposed. The type strain is StC1^T (=KACC 19231^T=JCM 32050^T).