prokaryotes - bacteria see Domain Bacteria Woese et al. 1990 stat. inval.
   Domain "Bacteria" Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum "Proteobacteria" Garrity et al. 2005 stat. inval. see Phylum Pseudomonadota Garrity et al. 2021
       Class Alphaproteobacteria Garrity et al. 2006
         Order Rhizobiales Kuykendall 2006 see Order Hyphomicrobiales Douglas 1957 (Approved Lists 1980)
           Family Rhizobiaceae Conn 1938 (Approved Lists 1980)
             01 Genus Agrobacterium Conn 1942 (Approved Lists 1980) nom. cons.
             02 Genus Allorhizobium de Lajudie et al. 1998
             03 Genus Carbophilus Meyer et al. 1994
             04 Genus Chelatobacter Auling et al. 1993 see Genus Aminobacter Urakami et al. 1992
             05 Genus Ciceribacter Kathiravan et al. 2013
             06 Genus Ensifer Casida 1982
             07 Genus Kaistia Im et al. 2005
             08 Genus Methylobrevis Poroshina et al. 2015
             09 Genus Neorhizobium Mousavi et al. 2015
             10 Genus Rhizobium Frank 1889 (Approved Lists 1980) nom. cons.
             11 Genus Shinella An et al. 2006
             12 Genus Sinorhizobium Chen et al. 1988 see Genus Ensifer Casida 1982