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A novel Gram-staining-negative, spiral-shaped bacterium, designated strain 64-1T, was isolated from oil reservoir water collected from Liaohe oilfield, north-eastern China. Growth occurred at 15–55 °C and pH 6.0–10.0. The sole respiratory quinone was Q-10. The predominant cellular fatty acids were summed feature 8 (C18 : 1 ω7c /C18 : 1 ω6c), C16 : 0 and C19 : 0 cyclo ω8c. The polar lipids consisted of phosphatidylethanolamine (PE), phosphatidylglycerol (PG), phosphatidylcholine (PC), an unidentified aminophospholipid (UAPL), an unidentified aminolipid (UAL) and two unidentified polar lipids (UPL). The genomic DNA G+C content of strain 64-1T was 64.5 mol%. Strain 64-1T shared the highest 16S rRNA gene sequence similarities with Phaeospirillum chandramohanii JA145T (92.0 %) and Telmatospirillum siberiense 26-4b1T (91.8 %). In the phylogenetic trees, the strain constituted a sub-cluster within the family Rhodospirillaceae . Based on the results of morphological, physiological, biochemical and phylogenetic analysis, strain 64-1T represents a new species of a novel genus within the family Rhodospirillaceae , for which the name Oleiliquidispirillum nitrogeniifigens gen. nov., sp. nov. is proposed. The type strain is 64-1T (=CGMCC 1.16798T=LMG 31399T).
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