Rubrolithibacter danxiaensis gen. nov., sp. nov. isolated from red sandy conglomerate in the Danxia Mountain.

A Gram-stain-negative, rod-shaped and non-motile bacterium, designated as strain SYSU DXS3258, was isolated from red sandy conglomerate sample collected from the Danxia Mountain in Guangdong Province, PR China. The bacterium was found to grow optimally at 28 °C, pH 7.0, and with 0-1% (w/v) NaCl. Phylogenetic analyses based on the 16S rRNA gene sequences placed strain SYSU DXS3258 within the family Sphingobacteriaceae. Strain SYSU DXS3258 showed the highest 16S rRNA gene sequence similarity to Pararcticibacter tournemirensis TF5-37.2-LB10 (95.5%), Paradesertivirga mongoliensis 1-32 (95.3%) and Desertivirga xinjiangensis 12157 (95.2%). Digital DNA-DNA hybridization, orthologous average nucleotide identity and average amino acid identity values between strain SYSU DXS3258 and the closest related members within the Sphingobacteriaceae were ≤ 13%, 70.3% and 69.9%, respectively. The genomic DNA G + C content was 38.8%. The major fatty acid was iso-C, C and C 2-OH. The predominant polar lipids were phosphatidylethanolamine, three glycolipids, one phospholipid and one unidentified polar lipid. The major respiratory quinone was Q-7. Based on phenotypic, phylogenetic, chemotaxonomic and genomic results, we propose that strain SYSU DXS3258 represents a novel species of a novel genus within the family Sphingobacteriaceae, for which the name Rubrolithibacter danxiaensis gen. nov., sp. nov. was proposed. The type strain is SYSU DXS3258 (= MCCC 1K09420 = KCTC 102322).