[living organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Prokaryota
     Kingdom Bacteria Cavalier-Smith 2002 - bacteria see Domain Bacteria Woese et al. 1990
       Subkingdom Negibacteria Cavalier-Smith 2002 - negibacteria see Domain Bacteria Woese et al. 1990
         Phylum Proteobacteria Garrity et al. 2005 see Superphylum Proteobacteria Craig et al. 2010
           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
             04 Order Kordiimonadales Kwon et al. 2005
             05 Order Magnetococcales Bazylinski et al. 2013
             06 Order "Parvularculales"
             07 Order Rhizobiales Kuykendall 2006
             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