procaryotes
   Domain Bacteria Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum Proteobacteria Garrity and Holt 2001 nom. nud. see Phylum Proteobacteria Garrity et al. 2005 stat. inval.
       Class "Gammaproteobacteria" "Garrity and Holt 2001" nom. nud. see Class Gammaproteobacteria Garrity et al. 2005
         Order "Legionellales" "Garrity and Holt 2001" nom. nud. see Order Legionellales Garrity et al. 2005
           1 Family Legionellaceae Brenner et al. 1979 (Approved Lists 1980) [monotypic]
           2 Family "Coxiellaceae" "Garrity and Holt 2001" nom. nud. see Family Coxiellaceae Garrity et al. 2005