A Gram-staining-negative,orange-pigmented,aerobic bacterial strain,designated KA37T,was isolated from a mangrove sediment sample collected from Yunxiao mangrove National Nature Reserve,Fujian Province,China.Growth was observed at temperatures from 4 to 37 ℃,at salinities from 0 to 3%and at pH from 5 to 10.Mg2+ ions were required for growth.Phylogenetic analysis based on 16S rRNA gene sequencing revealed that the isolate was a member of the genus Erythrobacter,which belongs to the family Erythrobacteraceae.Strain KA37T was most closely related to Erythrobacter gangjinensis K7-2T(96.9%sequence similarity),followed by Erythrobacter marinus HWDM-33T(96.8%),and others were below 96.6%.The major fatty acids were C17:1 ω6c,summed feature 3(comprising C16:1 ω7c and/or C16:1 ω6c)and summed feature 8(comprising C18:1 ω7c and/or C18:1 ω6c).Strain KA37T did not produce bacteriochlorophyll a.The predominant respiratory quinone was ubiquinone-10(Q-10).The polar lipids of strain KA37T were found to consist of sphingoglycolipid,phosphatidylglycerol,diphosphatidylglycerol,phosphatidylethanolamine,phosphatidylcholine,five unknown lipids and one unidentified phospholipid.According to its morphology,physiology,fatty acid composition and 16S rRNA sequence data,the novel strain most appropriately belongs to the genus Erythrobacter,but can readily be distinguished from Erythrobacter species with validly published name.The name Erythrobacter luteus sp.nov.is proposed for strain KA37T(=MCCC 1F01227T =KCTC42179T).