Description of Rhodobacter flavimaris sp. nov. and proposal of the genera Paenirhodobacter , Sedimentimonas , and Sinirhodobacter as synonyms of Rhodobacter .

Two Gram-stain-negative, aerobic, ovoid to short rod-shaped bacterial strains, designated as WL0062 ^T and WL0115, were isolated from coastal zone of the Yellow Sea, Jiangsu Province, PR China, respectively. Strain WL0062 ^T grew optimally at 28 °C, pH 7.0-8.0 and with 1.0-3.0% (w/v) NaCl. Strain WL0115 grew optimally at 28 °C, pH 6.0-7.0 and with 1.0-3.0% (w/v) NaCl. In the bac120 tree, strains WL0062 ^T and WL0115 clustered together with Sedimentimonas flavescens B57 ^T . The respiratory quinone of both strains was ubiquinone-10. The major polar lipids of both strains were diphosphatidylglycerol, phosphatidylglycerol, phosphatidylcholine, phosphatidylethanolamine, glycolipid, phosphatidylmonomethylethanolamine, and one unidentified polar lipid. The major fatty acids of strain WL0062 ^T were summed features 8 (C _18 : 1  ω 6 c and/or C _18 : 1  ω 7 c ). The major fatty acids of strain WL0115 were summed features 8 (C _18 : 1  ω 6 c and/or C _18 : 1  ω 7 c ), C _18 : 0 , iso-C _17 : 1  ω 5 c and C _20 : 4  ω 6/9/12/15 c (arachidonic acid). The G+C content of genomic DNA of strains WL0062 ^T and WL0115 was 64.0 mol% in both of them. Combined with the analysis of average nucleotide identity, average amino acid identity, and digital DNA-DNA hybridization, strain WL0062 ^T represents a novel species of the genus Rhodobacter , for which the name Rhodobacter flavimaris sp. nov is proposed. The type strain is WL0062 ^T (=MCCC 1K06014 ^T =JCM 34676 ^T =GDMCC 1.2427 ^T ). Strain WL0115 (=MCCC 1K07531=JCM 35568=GDMCC 1.3088) should belong to the same species as Sedimentimonas flavescens B57 ^T . In addition, on the basis of phylogenomic relationship and phenotypical characteristics, the genera Paenirhodobacter , Sedimentimonas , and Sinirhodobacter are proposed as synonyms of Rhodobacter .