Kingdom Bacteria Cavalier-Smith 2002 stat. inval. [paraphyletic?] - bacteria see Domain Bacteria Woese et al. 1990 stat. inval.
   Subkingdom Negibacteria Cavalier-Smith 2002 stat. inval. [paraphyletic?] - negibacteria see Domain Bacteria Woese et al. 1990 stat. inval.
     Infrakingdom Glycobacteria Cavalier-Smith 2002 stat. inval. see Domain Bacteria Woese et al. 1990 stat. inval.
       Superdivision Exoflagellata Cavalier-Smith 2002
         Division Proteobacteria Cavalier-Smith 2002 stat. inval.
           Subdivision Rhodobacteria Cavalier-Smith 2002
             Class Alphabacteria Cavalier-Smith 2002 nom. rej.
               Order Rickettsialesᵀ Gieszczykiewicz 1939 (Approved Lists 1980)