[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   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 Deltaproteobacteria Kuever et al. 2006
         1 Order Desulfurellales Kuever et al. 2006
         2 Order Desulfovibrionales Kuever et al. 2006
         3 Order Desulfobacterales Kuever et al. 2006
         4 Order Desulfarculales corrig. Kuever et al. 2006
         5 Order Desulfuromonadales corrig. Kuever et al. 2006
         6 Order Syntrophobacterales Kuever et al. 2006
         7 Order Bdellovibrionales Garrity et al. 2006
         8 Order Myxococcales Tchan et al. 1948 (Approved Lists 1980)