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 Thermofilaceae Burggraf et al. 1997 Genus Thermofilum Zillig and Gierl 1983