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)
                         01 Hyphomicrobium aestuarii Hirsch 1989
                         02 Hyphomicrobium chloromethanicum McDonald et al. 2001
                         03 Hyphomicrobium coagulans (ex Takada 1975) Hirsch 1989
                         04 Hyphomicrobium denitrificans Urakami et al. 1995
                         05 Hyphomicrobium facile corrig. Hirsch 1989
                         06 Hyphomicrobium hollandicum Hirsch 1989
                         07 Hyphomicrobium methylovorum Izumi et al. 1983
                         08 Hyphomicrobium sulfonivorans Borodina et al. 2002
                         09 Hyphomicrobium vulgareᵀ Stutzer and Hartleb 1898 (Approved Lists 1980)
                         10 Hyphomicrobium zavarzinii Hirsch 1989