Tags: Archaea.
Strain 121 (Geogemma barossii) is a single-celled microbe of the domain Archaea. First discovered 200 miles (320 km) off Puget Sound in a hydrothermal vent it is a hyperthermophile able to survive and reproduce at 121 °C (250 °F) hence its name. It was (at the time of discovery) the only known form of life that can tolerate such high temperatures.