prokaryotes - bacteria see Domain Bacteria Woese et al. 1990 stat. inval.
   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
       1 Class "Methanomicrobia" Garrity et al. 2005 nom. inval.
       2 Class Archaeoglobi Garrity and Holt 2002 [monotypic]
       3 Class Halobacteria Grant et al. 2002
       4 Class Methanobacteria Boone 2002 [monotypic]
       5 Class Methanococci Boone 2002 [monotypic]
       6 Class Methanopyri Garrity and Holt 2002 [monotypic]
       7 Class Thermococci Zillig and Reysenbach 2002 [monotypic]
       8 Class Thermoplasmata Reysenbach 2002 [monotypic]