A bacterial strain isolated from an air sample, strain 5317J-$19^T$, was characterized. The isolate was an aerobic, motile, Gram-positive rod. The organism was able to grow between 4 and $35^{circ}C$ and between pH 6 and 9. The predominant fatty acids were anteiso-$C_{15:0}$ and iso-$C_{16:0}$. The major respiratory menaquinones were MK-12 and MK-11, and the minor ones were MK13, MK-10, and MK-9. Genomic DNA G+C content was 66 mol%. The diagnostic diamino acid of the peptidoglycan is presumably D-Orn. The peptidoglycan is supposed to be $B2{eta}$ type. The 16S rRNA gene sequence analysis indicated that this isolate belongs to the family Microbacteriaceae and had the highest sequence similarities with Salinibacterium xinjiangense $0543^T$ (97.6%), Salinibacterium amurskyense KMM $3673^T$ (97.2%), and Leifsonia bigeumensis MSL-$27^T$ (97.2%). Phylogenetic analysis and phenotypic characteristics support the proposal of a new genus and a novel species, with the name Homoserinimonas aerilata gen. nov., sp. nov. The type strain of Homoserinimonas aerilata is 5317J-$19^T$ (=KACC $15522^T$ =NBRC $108729^T$).