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 Rhizobiaceaeᵀ Conn 1938 (Approved Lists 1980)
                       Genus Methylobrevis Poroshina et al. 2015
                       0 [Tribe Rhizobieae Prévot 1948 (Approved Lists 1980)] see Family Rhizobiaceae Conn 1938 (Approved Lists 1980)
                       1.1 Genus Rhizobiumᵀ Frank 1889 (Approved Lists 1980)
                       1.1.0 [Genus Agrobacterium Conn 1942 (Approved Lists 1980)] see Genus Rhizobium Frank 1889 (Approved Lists 1980)
                       1.1.0 [Genus Allorhizobium de Lajudie et al. 1998] see Genus Rhizobium Frank 1889 (Approved Lists 1980)
                       1.2 Genus Neorhizobium Mousavi et al. 2015
                       2 Genus Sinorhizobium Chen et al. 1988 [monotypic]
                       3 Genus Carbophilus Meyer et al. 1994 [monotypic]
                       4.1 Genus Ensifer Casida 1982
                       4.2 Genus Ciceribacter Kathiravan et al. 2013 [monotypic]
                       5 Genus Kaistia Im et al. 2005
                       6 Genus Shinella An et al. 2006
                       n [Genus Chelatobacter Auling et al. 1993] see Genus Aminobacter Urakami et al. 1992