[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
         Order Syntrophobacterales Kuever et al. 2006
           Family Syntrophaceae Kuever et al. 2006
             1 Genus Syntrophus Mountfort et al. 1984
             2 Genus Desulfobacca Oude Elferink et al. 1999
             3 Genus Desulfomonile DeWeerd et al. 1991
             4 Genus Smithella Liu et al. 1999