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?]
             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)
                     Family Clostridiaceaeᵀ Pribram 1933 (Approved Lists 1980)
                       Genus Asaccharospora Gerritsen et al. 2014
                       Genus Caldisalinibacter Ben Hania et al. 2015
                       Genus Crassaminicella Lakhal et al. 2015
                       Genus Hydrogenispora Liu et al. 2014 [monotypic]
                       Genus Keratinibaculum Huang et al. 2015
                       Genus Proteiniclasticum Zhang et al. 2010
                       Genus Saccharofermentans Chen et al. 2010
                       Genus Salimesophilobacter Zhang et al. 2013
                       Genus Sporosalibacterium Rezgui et al. 2011
                       01.1 Genus Clostridiumᵀ Prazmowski 1880 (Approved Lists 1980)
                       01.2 Genus Oceanirhabdus Pi et al. 2013 [monotypic]
                       01.3 Genus Hungatella Kaur et al. 2014
                       01.4 Genus Intestinibacter Gerritsen et al. 2014 [monotypic]
                       01.5 Candidatus "Arthromitus" Snel et al. 1995
                       02 Genus Alkaliphilus Takai et al. 2001
                       03 Genus Anaerobacter Duda et al. 1996 [monotypic]
                       04 Genus Anaerosalibacter Rezgui et al. 2012 [monotypic]
                       05 Genus Anaerosporobacter Jeong et al. 2007 [monotypic]
                       06 Genus Anoxynatronum Garnova et al. 2003 [monotypic]
                       07 Genus Brassicibacter Fang et al. 2012 [monotypic]
                       08 Genus Butyricicoccus Eeckhaut et al. 2008 [monotypic]
                       09 Genus Caloramator Collins et al. 1994
                       10 Genus Caloranaerobacter Wery et al. 2001 [monotypic]
                       11 Genus Caminicella Alain et al. 2002 [monotypic]
                       12 Genus Cellulosibacter Watthanalamloet et al. 2012 [monotypic]
                       13 Genus Clostridiisalibacter Liebgott et al. 2008 [monotypic]
                       14 Genus Fervidicella Ogg and Patel 2010 [monotypic]
                       15 Genus Fonticella Fraj et al. 2013 [monotypic]
                       16 Genus Geosporobacter Klouche et al. 2007 [monotypic]
                       17 Genus Lactonifactor Clavel et al. 2007 [monotypic]
                       18 Genus Lutispora Shiratori et al. 2008 [monotypic]
                       19 Genus Natronincola corrig. Zhilina et al. 1999
                       20 Genus Oxobacter Collins et al. 1994 [monotypic]
                       21 Genus Sarcina Goodsir 1842 (Approved Lists 1980)
                       22 Genus Tepidimicrobium Slobodkin et al. 2006 [monotypic]
                       23 Genus Thermobrachium Engle et al. 1996 [monotypic]
                       24 Genus Thermohalobacter Cayol et al. 2000 [monotypic]
                       25 Genus Thermotalea Ogg and Patel 2009 [monotypic]
                       26 Genus Tindallia Kevbrin et al. 1999