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.
       Subdivision Euryarchaeota Cavalier-Smith 2002 see Phylum Euryarchaeota Garrity and Holt 2002 stat. inval.
         Superclass Neobacteria Cavalier-Smith 2002
           1 Class Methanothermea Cavalier-Smith 2002 nom. rej. [paraphyletic?] see Class Methanococci Boone 2002
           2 Class Archaeoglobea Cavalier-Smith 2002 nom. rej. [monotypic] see Class Archaeoglobi Garrity and Holt 2002
           3 Class Halomebacteria Cavalier-Smith 2002 nom. rej. see Class Halobacteria Grant et al. 2002