Alicyclobacillus acidoterrestris

Alicyclobacillus acidoterrestris is a species of Gram positive, strictly aerobic, bacterium. The bacteria are acidophilic and produce endospores. It was first isolated from soil. The species was originally classified as "Bacillus acidoterrestris" in 1987, but further 16S rRNA studies found that the species belonged in the newly created genus "Alicyclobacillus". The species name is derived from the Latin "acidum" (acid) and "terrestris" (from the earth), referring to its acidophilic nature and that it was isolated from soil.
"A. acidoterrestris" was among the first three species reclassified from the genus "Bacillus" to the newly created "Alicyclobacillus" in 1992, along with "A. acidocaldarius" and "A. cycloheptanicus".
The optimum growth temperature for "A. acidoterrestris" is 42-53 °C, and can grow in the 35-55 °C range, and in pH 2.2-5.8.