A Gram-stain-positive, strictly aerobic, yellow colony-forming bacterium, designated strain 3-3T, was isolated from forest soil of Bac Kan Province in Vietnam. Cells were non-motile rods without gliding motility, showing oxidase- and catalase-positive reactions. Growth was observed at 20–37 °C (optimum, 28 °C) and pH 5.5–9.5 (optimum, pH 7.5). The major cellular fatty acids were iso-C15 : 0, iso-C15 : 1 G and summed feature 3 (comprising C16 : 1ω6c and/or C16 : 1ω7c). Strain 3-3T contained phosphatidylethanoamine, three unidentified aminolipids and three unidentified lipids. The G+C content of the genomic DNA was 49.5 mol% and the only isoprenoid quinone detected was menaquinone 7 (MK-7). Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain 3-3T formed a tight phylogenetic lineage with Flavihumibacter petaseus T41T with a bootstrap value of 100 %. Strain 3-3T was related most closely to F. petaseus T41T with 97.3 % 16S rRNA gene sequence similarity and the level of DNA–DNA relatedness between the two was 9.4±1.2 %. Based on phenotypic, chemotaxonomic and molecular features, strain 3-3T represents a novel species of the genus Flavihumibacter, for which the name Flavihumibacter solisilvae sp. nov. is proposed. The type strain is 3-3T ( = KACC 17917T = JCM 19891T).
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