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