[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   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
         Order Syntrophobacterales Kuever et al. 2006
           Family Syntrophaceae Kuever et al. 2006
             Genus Syntrophus Mountfort et al. 1984
               1 Syntrophus buswellii Mountfort et al. 1984
               2 Syntrophus aciditrophicus Jackson et al. 2001 see Syntrophus aciditrophicus Jackson et al. 2015
               3 Syntrophus gentianae Wallrabenstein et al. 1996