Two novel bacterial strains, designated as SYSU D00823 T and SYSU D00873 T , were isolated from sandy soil of the Gurbantunggut Desert in Xinjiang, north-west China. SYSU D00823 T and SYSU D00873 T shared 99.0 % 16S rRNA gene sequence identity, and were both most closely related to Pedobacter xinjiangensis 12157 T with 96.1 % and 96.0 % similarities, respectively. Phylogenetic and phylogenomic analyses revealed that the two isolates and P. xinjiangensis 12157 T formed a separate distinct cluster in a stable subclade with the nearby species Pedobacter mongoliensis 1-32 T , as well as the genera Pararcticibacter and Arcticibacter . Furthermore, P. mongoliensis 1-32 T formed a separate deep-branching lineage and did not form a cluster with members of the genus Pedobacter . The average nucleotide identity and digital DNA–DNA hybridization values between SYSU D00823 T and SYSU D00873 T and related species were well below the thresholds for species delineation (<81.0 % and <24.0 %, respectively). The genomes of SYSU D00823 T and SYSU D00873 T were 6.19 and 6.43 Mbp in size with 40.4 % and 40.5 % DNA G+C contents, respectively. The predominant fatty acids (>10 %) of SYSU D00823 T and SYSU D00873 T were iso-C 15 : 0 , iso-C 17 : 0 3-OH and summed feature 3 (C 16 : 1 ω 7 c and/or C 16 : 1 ω 6 c ). Menaquinone-7 was the only respiratory quinone. The major polar lipids were phosphatidylethanolamine, glycosphingolipid, aminoglycolipid/glycolipid, aminophospholipid and three or four unidentified polar lipids. These data indicated that strains SYSU D00823 T and SYSU D00873 T should be assigned to two novel species of a new genus within the family Sphingobacteriaceae , for which the names Desertivirga arenae gen. nov., sp. nov. and Desertivirga brevis sp. nov. are proposed. The type strains are SYSU D00823 T (=CGMCC 1.18630 T =MCCC 1K04973 T =KCTC 82278 T ) and SYSU D00873 T (=CGMCC 1.18629 T =MCCC 1K04974 T =KCTC 82281 T ), respectively. Accordingly, the reclassification of P. xinjiangensis as Desertivirga xinjiangensis comb. nov., and P. mongoliensis as Paradesertivirga mongoliensis gen. nov., comb. nov. are also proposed.
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