life see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Empire Prokaryota (Dougherty 1957) Allsopp 1969 [monotypic] see Domain Bacteria Woese et al. 1990 stat. inval.
     Kingdom Bacteria Cavalier-Smith 1998 nom. inval. [paraphyletic] - bacteria see Kingdom Bacteria Cavalier-Smith 2002 stat. inval.
       Subkingdom Negibacteria Cavalier-Smith 1987 nom. inval. [paraphyletic?] see Subkingdom Negibacteria Cavalier-Smith 2002 stat. inval.
         Infrakingdom Glycobacteria Cavalier-Smith 1998 nom. inval. [paraphyletic?] see Infrakingdom Glycobacteria Cavalier-Smith 2002 stat. inval.
           Superphylum Pimelobacteria (Cavalier-Smith 1992) Cavalier-Smith 1998 [paraphyletic?] see Domain Bacteria Woese et al. 1990 stat. inval.
             Phylum Proteobacteria Garrity and Holt 2001 nom. nud. see Phylum Proteobacteria Garrity et al. 2005 stat. inval.
               Subphylum Rhodobacteria Cavalier-Smith 1998 see Phylum Proteobacteria Garrity and Holt 2001 nom. nud.
                 Infraphylum Alphabacteria (Cavalier-Smith 1992) Cavalier-Smith 1998 see Class Alphaproteobacteria Garrity et al. 2006
                   1 Genus Rhodospirillum Molisch 1907 (Approved Lists 1980)
                   2 Genus Rickettsia da Rocha-Lima 1916 (Approved Lists 1980) nom. cons.
                   3 Genus Agrobacterium Conn 1942 (Approved Lists 1980) nom. cons.