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A Gram-negative, aerobic, short rod-shaped, non-motile, pale-yellow bacterial strain was isolated from biological soil crusts collected in the desert of Kubuqi, Inner Mongolia of China, designated MIMBbqt12(T). The G+C content of the genomic DNA of strain MIMBbqt12(T) was 49.5 mol%. Phylogenetic analysis using 16S rRNA gene sequences showed that strain MIMBbqt12(T) belongs to the genus Spirosoma with the highest sequence similarity of 93.5% to Spirosoma arcticum R2-35(T). The major fatty acids of strain MIMBbqt12(T) were C-16:0) iso-C-15:0, iso-C(17:0)3-OH, C-16:1 omega 5c and summed feature 3 (C-16:1 omega 6c and/or C-16:1 omega 7c). The results of phenotypic properties and phylogenetic distinctiveness supported that strain MIMBbqt12(T) represents a novel species of the genus Spirosoma, for which the name Spirosoma soli sp. nov. is proposed. The type strain is MIMBbqt12(T) (=MCCC 1K01308(T)=KCTC 42805(T)).