Acidocaldarius

Acidocaldarius is a genus of thermotolerant, acidophilic bacteria that belongs to the family Acidocaldariaceae. These microorganisms are notable for their ability to survive and thrive in highly acidic environments, typically found in areas with high temperatures and sulfur-rich substrates.

Species within this genus are typically rod-shaped and Gram-positive, and can be found in various natural habitats, including hot springs, geothermal areas, and acidic environments such as the Rio Tinto in Spain. They are able to tolerate unusually low pH levels, often as low as 2, and temperatures between 45 and 80°C.

Acidocaldarius species are chemoorganotrophic bacteria, meaning they obtain energy from the breakdown of organic compounds. They play a crucial role in the ecosystems in which they reside, serving as decomposers and aiding in the breakdown of organic matter. These bacteria have also been of interest in industrial applications due to their ability to produce high temperatures-resistant enzymes.

A total of four species have been identified within the Acidocaldarius genus, all of which are thermophilic and acidophilic. The first species discovered was A. hospitalis, which was isolated from a hot spring in Los Lagos Region, Chile. Additional species, such as A. hospitalis variance, A. manehulti, and A. iodeshipypes, have been described and characterized in subsequent years.