[living organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Prokaryota Margulis 1974 nom. nud.
     Kingdom Bacteria Cavalier-Smith 2002 stat. inval. - bacteria see Domain Bacteria Woese et al. 1990 stat. inval.
       Subkingdom Negibacteria Cavalier-Smith 2002 stat. inval. - negibacteria see Domain Bacteria Woese et al. 1990 stat. inval.
         Phylum Proteobacteria Garrity et al. 2005 stat. inval. see Phylum Pseudomonadota Garrity et al. 2021
           Class Alphaproteobacteria Garrity et al. 2006
             01 Genus Breoghania Gallego et al. 2011
             02 Order Caulobacterales Henrici and Johnson 1935 (Approved Lists 1980)
             03 Order Kiloniellales Wiese et al. 2009 see Order Rhodospirillales Pfennig and Trüper 1971 (Approved Lists 1980)
             04 Order Kordiimonadales Kwon et al. 2005
             05 Order Magnetococcales Bazylinski et al. 2013
             06 Order "Parvularculales" Garrity et al. 2003 nom. nud.
             07 Order Rhizobiales Kuykendall 2006 see Order Hyphomicrobiales Douglas 1957 (Approved Lists 1980)
             08 Order Rhodobacterales Garrity et al. 2006
             09 Order Rhodospirillales Pfennig and Trüper 1971 (Approved Lists 1980)
             10 Order Rickettsiales Gieszczykiewicz 1939 (Approved Lists 1980)
             11 Order Sneathiellales Kurahashi et al. 2008
             12 Order Sphingomonadales Yabuuchi and Kosako 2006