Lobus fulgidus is a sulfur-reducer that can sour oil wells.
Halobacteria are salt-loving microbes that give a pink tinge to salt water evaporation ponds, the Dead Sea and salted fish.
Pyrolobus fumarii led scientists to extend the upper temperature limit for life to 113 degrees Celsius (235.4 degrees Fahrenheit).
Pyrococcus furiosis is the source of an extra-stable enzyme that can endure many cycles in the process of PCR, the method behind gene sequencing and DNA fingerprinting.
Sulfolobus acidocaldarius is used to leach copper and iron from ore.