gen. nov., sp. nov., a bacterium isolated from soil with the aid of culture supernatant containing resuscitation-promoting factor.

An orange-golden iridescent culture, designated A1X5R2, was isolated from a compost soil suspension which was amended with NCTC 2665 culture supernatant. The cells were non-motile, Gram-stain-negative, 0.4-0.5 µm wide and 0.7-1.4 µm long. The 16S rRNA-based phylogenetic and whole-genome analyses revealed that strain A1X5R2 forms a distinct lineage within the family and is closely related to members of the genus (, 93.04 % similarity, and , 92.77 %). The organism grew at 22-47 °C (optimal at 37 °C), salinity <3 % (optimal at 1.5 %) and at pH 7. The major respiratory quinone was ubiquinone-10, but a small quantity of ubiquinone-9 was also detected The major polyamine was homospermidine, but a small quantity of putrescine was also detected. The strain contained Cω7, C, C ω7 and C as the major fatty acids. The main polar lipids were phosphatidylethanolamine, phosphatidylglycerol, phosphatidylcholine, phosphatidylinositol, sphingoglycolipid, diphosphatidylglycerol, two unidentified phospholipids and three unidentified amino lipids. The DNA G+C content was 64.9 mol%. According to the results of phylogenetic and phylogenomic analyses, as well as its physiological characteristics, strain A2X5R2 represents the type species of a novel genus within the family . The name gen. nov., sp. nov. is proposed, with the type strain being A1X5R2 (=NCCB 100839=DSM 112829).