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 Posibacteria Cavalier-Smith 2002 [paraphyletic?]
       Subdivision Actinobacteria Cavalier-Smith 2002 [paraphyletic?] see Phylum Actinobacteria Garrity and Holt 2001
         Class Arthrobacteria Cavalier-Smith 2002 nom. rej. [paraphyletic?] see Class Actinobacteria Stackebrandt et al. 1997 nom. illeg.
           Order Actinomycetalesᵀ Buchanan 1917 (Approved Lists 1980)