A novel aerobic, heterotrophic, prosthecate bacterium, designated 26III/A02/215, was isolated from surface water of the north-western Mediterranean Sea. Cells stained Gram-negative and were straight to slightly curved rods, forming red colonies on agar plates. The strain grew at 15–37 °C inclusive (optimum 30 °C) and grew optimally at seawater salinity. Growth was observed on organic acids, amino acids and complex organic substrates. The fatty acids (>5 %) detected in strain 26III/A02/215 were C 6, C 7 and C. The lipid pattern indicated the presence of phosphatidylglycerol, glucuronopyranosyldiglyceride, monoglycosyldiglyceride, an unidentified glycolipid and three unidentified phospholipids. Phosphatidylethanolamine and diphosphatidylglycerol were absent. Ubiquinone Q-10 was the only respiratory lipoquinone. The G+C content of the genomic DNA was 46.8 mol%. Comparative 16S rRNA gene sequence analysis indicated that strain 26III/A02/215 belonged to the branch of the order . This affiliation was consistent with the results of polar lipid analyses. Among this group, the novel isolate was most closely related to (93.9 % 16S rRNA gene sequence similarity to the type strain). On the basis of genotypic, chemotaxonomic and phenotypic distinctness, we propose a novel genus, gen. nov., with sp. nov. as the type species. The type strain of is 26III/A02/215 (=DSM 19091 =CIP 109500 =OOB 269).


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