procaryotes
   Domain Archaea Woese et al. 1990 stat. inval. see Domain Archaea Woese et al. 2024
     Phylum Euryarchaeota Garrity and Holt 2002 stat. inval. see Kingdom Methanobacteriati (Garrity and Holt 2023) Oren and Göker 2024
       Class Thermoplasmata Reysenbach 2001 nom. inval. see Class Thermoplasmata Reysenbach 2002
         Order Thermoplasmatales Reysenbach 2001 nom. inval. see Order Thermoplasmatales Reysenbach 2002
           1 Family Thermoplasmataceae Reysenbach 2001 nom. inval. see Family Thermoplasmataceae Reysenbach 2002
           2 Family Picrophilaceae Schleper et al. 1996