Thermoanaerobacter acetoethylicus
Thermoanaerobacter acetoethylicus, formerly called "Thermobacteroides acetoethylicus", is a species of thermophilic, nonspore-forming bacteria. "T. acetoethylicus" was first isolated from Octopus Spring in Yellowstone National Park. The bacteria produce ethanol and acetic acid as fermentation products, but do not produce lactic acid. The growth range of "T. ethanolicus" is 40-80°C and pH 5.5-8.5, with the optimum growth temperature around 65°C. The species was originally placed in its own new genus of "Thermobacteroides" in 1981. In 1993, based on further study, the species was moved into the genus "Thermoanaerobacter".