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
                     Genus Syntrophusᵀ Mountfort et al. 1984
                       1 Syntrophus aciditrophicus Jackson et al. 2015
                       2 Syntrophus buswelliiᵀ Mountfort et al. 1984
                       3 Syntrophus gentianae Wallrabenstein et al. 1996