[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum "Proteobacteria" Garrity et al. 2005 stat. inval. see Phylum Pseudomonadota Garrity et al. 2021
       Class Gammaproteobacteria Garrity et al. 2005
         Order Legionellales Garrity et al. 2005
           Family Legionellaceae Brenner et al. 1979 (Approved Lists 1980)
             Genus Legionella Brenner et al. 1979 (Approved Lists 1980)
               [Legionella pneumophila] Brenner et al. 1979 (Approved Lists 1980)
                 1 Legionella pneumophila subsp. pneumophilaᵀ (Brenner et al. 1979) Brenner et al. 1989
                 2 Legionella pneumophila subsp. fraseri Brenner et al. 1989
                 3 Legionella pneumophila subsp. pascullei Brenner et al. 1989