procaryotes Domain Archaea Woese et al. 1990 stat. inval. see Domain Archaea Woese et al. 2024 Phylum Crenarchaeota Garrity and Holt 2002 stat. inval. see Phylum Thermoproteota Garrity and Holt 2021 Class Thermoprotei Reysenbach 2001 nom. inval. see Class Thermoprotei Reysenbach 2002 Order Thermoproteales Zillig and Stetter 1982 Family Thermoproteaceae Zillig and Stetter 1982 1 Genus Thermoproteus Zillig and Stetter 1982 2 Genus Caldivirga Itoh et al. 1999 3 Genus Pyrobaculum Huber et al. 1988 4 Genus Thermocladium Itoh et al. 1998