Kingdom Bacteria Cavalier-Smith 2002 stat. inval. [paraphyletic?] - bacteria see Domain Bacteria Woese et al. 1990 stat. inval.
   Subkingdom Unibacteria Cavalier-Smith 2002 [paraphyletic?] see Domain Bacteria Woese et al. 1990 stat. inval.
     Division Archaebacteria Cavalier-Smith 2002 see Domain Archaea Woese et al. 1990 stat. inval.
       1 Subdivision Euryarchaeota Cavalier-Smith 2002 see Phylum Euryarchaeota Garrity and Holt 2002 stat. inval.
       2 Subdivision Crenarchaeota Cavalier-Smith 2002 [monotypic] see Phylum Crenarchaeota Garrity and Holt 2002 stat. inval.
       3 Order Candidatus Korarchaeota Cavalier-Smith 2002, incertae sedis see Phylum Korarchaeota Ludwig and Klenk 2001 nom. pro-inval.