Sulfolobus solfataricus, isolated from hot springs in Solfatara, Italy (xml)
Halobacterium sp, viable environment consists of 4-5M NaCl (xml)
Pyrococcus abyssi, isolated from inside a vent at depth 3,500 metres in the southwest Pacific (xml)
Thermoplasma acidophilum, borrows many genes from Sulfolobus solfataricus (xml)