Bacillus flexus is an aerobic, Gram-variable, rod-shaped, endospore-forming, oxidase-positive bacterium. The endospores are ellipsoidal, located in central/paracentral, unswollen sporangia. In laboratory conditions, it produces opaque, creamish, raised-margin colonies at 30 ± 2°C when incubated for 24–72 hrs. on tryptic soy agar. This bacterial species may be isolated from feces (poultry) and soil.
This species has been recently proposed to be transferred into the genus Priestia.[3] The correct nomenclature would then be Priestia flexa.
^Zhao, Jian; Lan, Xiaojun; Su, Jun; Sun, Lei; Rahman, Erkin (June 2008). "Isolation and identification of an alkaliphilic Bacillus flexus XJU-3 and analysis of its alkaline amylase". Wei Sheng Wu Xue Bao = Acta Microbiologica Sinica. 48 (6): 750–756. ISSN0001-6209. PMID18720839.
^Jebeli, Mohammad Ahmadi; Maleki, Afshin; Amoozegar, Mohammad Ali; Kalantar, Enayatollah; Izanloo, Hassan; Gharibi, Fardin (2017-02-01). "Bacillus flexus strain As-12, a new arsenic transformer bacterium isolated from contaminated water resources". Chemosphere. 169: 636–641. doi:10.1016/j.chemosphere.2016.11.129. ISSN0045-6535. PMID27912188.