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. 1990 [paraphyletic?]
             Superphylum Terrabacteria Battistuzzi et al. 2004
               Phylum Firmicutes corrig. Gibbons and Murray 1978 (Approved Lists 1980)
                 Class Clostridia Rainey 2010
                   Order Clostridialesᵀ Prévot 1953 (Approved Lists 1980)
                     Genus Anaerobium Patil et al. 2015, incertae sedis
                     Family Proteinivoraceae Kevbrin et al. 2014 [monotypic]
                     01 Genus Anaerobranca Engle et al. 1995, incertae sedis
                     02 Genus Anaerovirgula Pikuta et al. 2006, incertae sedis [monotypic]
                     03 Genus Blautia Liu et al. 2008, incertae sedis
                     04 Genus Carboxydocella Sokolova et al. 2002, incertae sedis
                     05 Genus Dethiosulfatibacter Takii et al. 2007, incertae sedis [monotypic]
                     06.1 Genus Flavonifractor Carlier et al. 2010, incertae sedis [monotypic]
                     06.2 Genus Intestinimonas Kläring et al. 2013, incertae sedis [monotypic]
                     06.3 Genus Pseudoflavonifractor Carlier et al. 2010, incertae sedis
                     07 Genus Howardella Cook et al. 2007, incertae sedis [monotypic]
                     08 Genus Natranaerovirga Sorokin et al. 2012, incertae sedis
                     09 Genus Proteiniborus Niu et al. 2008, incertae sedis [monotypic]
                     10 Genus Proteocatella Pikuta et al. 2009, incertae sedis
                     11 Genus Thermaerobacter Takai et al. 1999, incertae sedis
                     12.1 Genus Acidaminobacter Stams and Hansen 1985, incertae sedis [monotypic]
                     12.2 Genus Guggenheimella Wyss et al. 2005, incertae sedis [monotypic]
                     12.3 Genus Soehngenia Parshina et al. 2003, incertae sedis [monotypic]
                     13.1 Genus Anaerovorax Matthies et al. 2000, incertae sedis [monotypic]
                     13.2 Genus Mogibacterium Nakazawa et al. 2000, incertae sedis
                     14 Genus Sulfobacillus Golovacheva and Karavaiko 1991, incertae sedis
                     15.1 Genus Acetoanaerobium Sleat et al. 1985, incertae sedis [monotypic]
                     15.2 Genus Symbiobacterium Ohno et al. 2000, incertae sedis [monotypic]
                     16 Family "Catabacteriaceae" (sic) Lau et al. 2007 nom. inval. [monotypic]
                     17 Family Caldicoprobacteraceae Yokoyama et al. 2010 [monotypic]
                     18 Family Christensenellaceae Morotomi et al. 2012 [monotypic]
                     19.1 Family Clostridiaceaeᵀ Pribram 1933 (Approved Lists 1980)
                     19.2 Family Gracilibacteraceae Lee et al. 2010 [monotypic]
                     20 Family Defluviitaleaceae Jabari et al. 2012 [monotypic]
                     21.1 Family Lachnospiraceae Rainey 2010
                     21.2 Family Ruminococcaceae Rainey 2010
                     22.1 Family Peptostreptococcaceae Ezaki 2010
                     22.2.1 Genus Fusibacter Ravot et al. 1999, incertae sedis
                     22.2.2 Genus Sedimentibacter Breitenstein et al. 2002, incertae sedis
                     22.2.3 Genus Sporanaerobacter Hernandez-Eugenio et al. 2002, incertae sedis [monotypic]
                     22.2.4 Genus Tissierella Collins and Shah 1986, incertae sedis
                     22.2.5 Family Peptoniphilaceae Johnson et al. 2014
                     23 Family Eubacteriaceae Ludwig et al. 2010
                     24 Family Peptococcaceae Rogosa 1971 (Approved Lists 1980)
                     25 Family Heliobacteriaceae Madigan and Asao 2010
                     26 Family Syntrophomonadaceae Zhao et al. 1993