Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 2024
             Kingdom Bacillatiᵀ (Gibbons and Murray 1978) Oren and Göker 2024
               Phylum Bacillotaᵀ Gibbons and Murray 2021
                 Class Syntrophomonadia Chuvochina et al. 2024
                   Order Syntrophomonadalesᵀ Chuvochina et al. 2024
                     Family Syntrophomonadaceaeᵀ Zhao et al. 1993
                       01 Genus Anaerobranca Engle et al. 1995
                       02 Genus Dethiobacter Sorokin et al. 2008 [monotypic]
                       03 Genus Pelospora Matthies et al. 2000 [monotypic]
                       04 Genus Syntrophomonasᵀ McInerney et al. 1982
                       05 Genus Syntrophospora Zhao et al. 1990
                       06 Genus Thermohydrogenium Zacharova et al. 1996 [monotypic]
                       07 Genus Thermosyntropha Svetlitshnyi et al. 1996 [monotypic]
                       08 Genus "Natronoanaerobium" Humayoun et al. 2003 nom. inval.
                       09 Genus "Candidatus Contubernalis" Zhilina et al. 2020
                       10 Genus "Candidatus Syntrophocurvum" Sorokin et al. 2020
                       11 Genus "Candidatus Syntrophofaba" Sorokin et al. 2020
                       12 Genus "Candidatus Syntrophonatronum" Sorokin et al. 2020
                       13 Genus "Candidatus Thermosyntrophomonas" Cheng et al. 2025 nom. pro-inval.