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 Clostridia Rainey 2010
                   Order "Candidatus Darwinibacterales" corrig. Puchol-Royo et al. 2025 nom. pro-inval.
                   01 Genus Helicovermis Miyazaki et al. 2024, incertae sedis
                   02 Genus "Ethanologenbacterium" Xing et al. 2004 nom. inval., incertae sedis
                   03 Genus "Candidatus Alkanivorans" Wu et al. 2022 nom. pro-inval., incertae sedis
                   04 Genus "Candidatus Alloclostridium" Glendinning et al. 2022, incertae sedis
                   05 Genus "Candidatus Aphodoplasma" Gilroy et al. 2022, incertae sedis
                   06 Genus "Candidatus Avimonoglobus" Gilroy et al. 2022, incertae sedis
                   07 Genus "Candidatus Caccopulliclostridium" Gilroy et al. 2022, incertae sedis
                   08 Genus "Candidatus Egerieisoma" Gilroy et al. 2022, incertae sedis
                   09 Genus "Candidatus Faecicola" Gilroy et al. 2022, incertae sedis
                   10 Genus "Candidatus Heteroclostridium" Glendinning et al. 2022, incertae sedis
                   11 Genus "Candidatus Limihabitans" Gilroy et al. 2022, incertae sedis
                   12 Genus "Candidatus Merdicola" Gilroy et al. 2022, incertae sedis
                   13 Genus "Candidatus Neoclostridium" Glendinning et al. 2022, incertae sedis
                   14 Genus "Candidatus Onthoplasma" Gilroy et al. 2022, incertae sedis
                   15 Genus "Candidatus Protoclostridium" Glendinning et al. 2022, incertae sedis
                   16 Genus "Candidatus Roslinia" Glendinning et al. 2022 nom. pro-illeg., incertae sedis
                   17 Genus "Candidatus Scatovivens" Gilroy et al. 2022, incertae sedis
                   18 Family "Candidatus Galloscillospiraceae" Gilroy et al. 2022, incertae sedis [monotypic]
                   20 Order Caldicellulosiruptorales Chuvochina et al. 2024 [monotypic]
                   21 Order Desulfitibacterales Chuvochina et al. 2024
                   22 Order Eubacteriales Buchanan 1917 (Approved Lists 1980)
                   23 Order Halanaerobiales corrig. Rainey and Zhilina 1995
                   24 Order Koleobacterales Sakamoto et al. 2021 [monotypic]
                   25 Order Natranaerobiales Mesbah et al. 2007
                   26 Order Peptostreptococcales Chuvochina et al. 2024
                   27 Order Thermoanaerobacterales Wiegel 2010
                   28 Order Thermosediminibacterales Zhang et al. 2019
                   29 Order Tissierellales Alauzet et al. 2020