General Information: Temp: Thermophile. Recent rDNA analysis and DNA-DNA hybridization studies using spore-forming thermophilic subsurface isolates from formation waters of oilfields in Russia, Kazakhstan and China provided enough evidence to define the phylogenetically distinct, physiologically and morphologically consistent taxon Geobacillus. Geobacillus species are chemo-organotrophic, obligately thermophilic, neutrophilic, motile, spore-forming, aerobic or facultatively anaerobic Gram-positive bacterium.