A Gram-stain-negative, non-spore-forming, aerobic, motile, ovoid or short rod shaped bacterium, designed strain B17T, was isolated from the culture broth of Picochlorum sp. 122. Phylogenetic analyses based on 16S rRNA gene sequences indicated that strain B17T forms a stable cluster with Oceanicolagranulosus MCCC 1A10589T (with the highest 16S rRNA gene similarity of 95.8 %) and Roseisalinusantarcticus DSM 11466T in the family Rhodobacteraceae. The only detected respiratory quinone was Q-10. The major cellular fatty acids were C18 : 1 ω7c/ω6c, C17 : 1iso I/anteiso B and C16 : 0. The major polar lipids were phosphatidylglycerol, diphosphatidylglycerol, an unidentified phospholipid and two unidentified lipids. The genome G+C content was 69 mol%. Characteristics, such as a long lag phase, being motile with single polar flagellum, no aminolipid content, and little or no C18 : 1ω7c11-methyl and C19 : 0cyclo ω8c content could significantly distinguish strain B17T from its closely related type strains. Therefore strain B17T is suggested to represent a new species in a new genus, for which Histidinibacterium lentulum gen. nov., sp. nov. is proposed. The type strain B17T (=MCCC 1K03225T=KCTC 52553T).
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