sp. nov., isolated from corridor air.

A Gram-stain-positive, facultatively anaerobic, non-motile, endospore-forming and rod-shaped bacterium, occurring singly or in pairs, designated TB2019, was isolated from environmental monitoring samples of corridor air collected at the Tianjin Institute for Drug Control, Tianjin Province (PR China). The isolate was able to grow at 15-40 °C (optimum growth at 37 °C), pH 6.0-8.0 (pH 7.0) and in the presence of 0-2% (w/v) NaCl (0% NaCl). Comparison of 16S rRNA gene sequences indicated that TB2019 was most closely related to CGMCC 1.11012 (98.63%), Q4-3 (98.19%), DSM 13188 (97.55%), P26E (97.33%) and DSM 15391 (97.19%). The digital DNA-DNA hybridization and the average nucleotide identity values between TB2019 and the five type strains mentioned above ranged from 20.7 to 25.0% and 75.2 to 81.3%, respectively, and the genomic DNA G+C content was 49.52 mol%. The diagnostic cell-wall sugar was ribose, and the diagnostic amino acid was -diaminopimelic acid. The polar lipids of TB2019 included diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, three unidentified aminophospholipids and one unidentified phospholipid. MK-7 was the predominant menaquinone, and anteiso-C (30.6%) was the major fatty acid. Based on the polyphasic taxonomic data, strain TB2019 represents a novel species of the genus , for which the name sp. nov. is proposed. The type strain is TB2019 (=CICC 25065=JCM 34610).