[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 hackeliae Brenner et al. 1985