Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 1990 [paraphyletic?]
             Superphylum "Proteobacteria" Craig et al. 2010
               Phylum "Alphaproteobacteria" Garrity et al., 2006 [monotypic]
                 Class Alphaproteobacteriaᵀ Garrity et al. 2006
                   Order Rhizobiales Kuykendall 2006
                     Family Hyphomicrobiaceae Babudieri 1950 (Approved Lists 1980)
                       Genus Hyphomicrobiumᵀ Stutzer and Hartleb 1898 (Approved Lists 1980)
                         Hyphomicrobium facile corrig. Hirsch 1989
                           Hyphomicrobium facile subsp. ureaphilum corrig. Hirsch 1989