Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 1990 [paraphyletic?]
             Phylum "Deltaproteobacteria" Kuever et al., 2006 [polyphyletic]
               Class Deltaproteobacteriaᵀ Kuever et al. 2006
                 Order Syntrophobacterales Kuever et al. 2006
                   Family Syntrophaceae Kuever et al. 2006
                     1.1 Genus Syntrophusᵀ Mountfort et al. 1984
                     1.2 Genus Smithella Liu et al. 1999 [monotypic]
                     2.1 Genus Desulfobacca Oude Elferink et al. 1999 [monotypic]
                     2.2 Genus Desulfomonile DeWeerd et al. 1991