Oleiliquidispirillum nitrogeniifigens gen. nov., sp. nov., a new member of the family Rhodospirillaceae isolated from oil reservoir water.

A novel Gram-staining-negative, spiral-shaped bacterium, designated strain 64-1 ^T , 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 (C _18 : 1  ω 7 c /C _18 : 1  ω 6 c ), C _16 : 0 and C _19 : 0 cyclo ω 8 c . 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 64-1 ^T was 64.5 mol%. Strain 64-1 ^T shared the highest 16S rRNA gene sequence similarities with Phaeospirillum chandramohanii JA145 ^T (92.0 %) and Telmatospirillum siberiense 26-4b1 ^T (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 64-1 ^T 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 64-1 ^T (=CGMCC 1.16798 ^T =LMG 31399 ^T ).