A Gram-negative, rod-shaped, aerobic, non-motile, bacterium (YG-17(T)) was isolated from eutrophic Taihu lake sediment. Colonies grown on YG agar plates were circular, convex, and yellow-colored. On the basis of 16S rRNA gene sequence similarity, strain YG-17(T) was shown to be closely related to Novosphingobium aromaticivorum (97.9%), followed by Novosphingobium stygium (97.5%), Novosphingobium subterranea (96.9%) and Novosphingobium taihuense (96.7%). The DNA-DNA relatedness values of strain YG-17(T) to the most phylogenetically related species N. aromaticivorum and N. stygium were 14% and 21%, respectively. The G+C content of the genomic DNA was 63.2 mol%. The major respiratory quinone was ubiquinone-10 and major fatty acids were C(18:1 ω7c), C(17:1 ω6c) and C(14:0)2-OH. Sphingoglycolipids were present, and spermidine was detected as the major polyamine. According to comparative physiological and chemotaxonomic analysis, strain YG-17(T) is proposed to be a novel species of the genus Novosphingobium, with the name of Novosphingobium sediminis sp. nov. The type strain is YG-17(T) (NBRC 106119(T)= CGMCC 1.9114(T)).
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