Kingdom Bacteria Cavalier-Smith 2002 - bacteria see Domain Bacteria Woese et al. 1990
   Subkingdom Unibacteria Cavalier-Smith 2002 see Domain Bacteria Woese et al. 1990
     Division Archaebacteria Cavalier-Smith 2002 see Domain Archaea Woese et al. 1990
       1 Subdivision Euryarchaeota Cavalier-Smith 2002 see Phylum Euryarchaeota Garrity and Holt 2001
       2 Subdivision Crenarchaeota Cavalier-Smith 2002 see Phylum Crenarchaeota Garrity and Holt 2001
       3 Candidate order Korarchaeota Cavalier-Smith 2002, incertae sedis see Phylum Korarchaeota Ludwig and Klenk 2001