[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 Deltaproteobacteria Kuever et al. 2006
             1 Genus Deferrisoma Slobodkina et al. 2012
             2 Order Bdellovibrionales Garrity et al. 2006
             3 Order Desulfarculales corrig. Kuever et al. 2006
             4 Order Desulfobacterales Kuever et al. 2006
             5 Order Desulfovibrionales Kuever et al. 2006
             6 Order Desulfurellales Kuever et al. 2006
             7 Order Desulfuromonadales corrig. Kuever et al. 2006
             8 Order Myxococcales Tchan et al. 1948 (Approved Lists 1980)
             9 Order Syntrophobacterales Kuever et al. 2006