IRMNG Taxon list
- Geogemma indica Kashefi, Holmes & Lovley, 2006
- Geogemma pacifica Kashefi, Holmes & Lovley, 2006
- Hyperthermus butylicus Zillig, Holz & Wunderl, 1991
- Pyrodictium abyssi Pley, Schipka, Gambacorta, Jannasch, Fricke, Rachel & Stetter, 1991
- Pyrodictium brockii Stetter, Konig & Stackebrandt, 1984
- Pyrodictium occultum Stetter, Konig & Stackebrandt, 1984
- Pyrolobus fumarii Blochl, Rachel, Burggraf, Hafenbradl, Jannasch & Stetter, 1997
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