[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990
     Phylum "Proteobacteria" Garrity et al. 2005 see Superphylum Proteobacteria Craig et al. 2010
       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