prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   Domain "Bacteria" Woese et al. 1990
     Phylum "Firmicutes" corrig. Gibbons and Murray 1978 (Approved Lists 1980)
       Class Clostridia Rainey 2010
         Order Clostridiales Prévot 1953 (Approved Lists 1980)
           01 Family "Catabacteriaceae" (sic) Lau et al. 2007 nom. inval. [monotypic]
           02 Family Caldicoprobacteraceae Yokoyama et al. 2010 [monotypic]
           03 Family Clostridiaceae Pribram 1933 (Approved Lists 1980)
           04 Family Defluviitaleaceae Jabari et al. 2012 [monotypic]
           05 Family Eubacteriaceae Ludwig et al. 2010
           06 Family Gracilibacteraceae Lee et al. 2010 [monotypic]
           07 Family Heliobacteriaceae Madigan and Asao 2010
           08 Family Lachnospiraceae Rainey 2010
           09 Family Peptococcaceae Rogosa 1971 (Approved Lists 1980)
           10 Family Peptostreptococcaceae Ezaki 2010
           11 Family Proteinivoraceae Kevbrin et al. 2014 [monotypic]
           12 Family Ruminococcaceae Rainey 2010
           13 Family Syntrophomonadaceae Zhao et al. 1993
           14 Genus Acetoanaerobium Sleat et al. 1985, incertae sedis
           15 Genus Acidaminobacter Stams and Hansen 1985, incertae sedis
           16 Genus Anaerobium Patil et al. 2015, incertae sedis
           17 Genus Anaerobranca Engle et al. 1995, incertae sedis
           18 Genus Anaerococcus Ezaki et al. 2001, incertae sedis
           19 Genus Anaerovirgula Pikuta et al. 2006, incertae sedis
           20 Genus Anaerovorax Matthies et al. 2000, incertae sedis
           21 Genus Blautia Liu et al. 2008, incertae sedis
           22 Genus Carboxydocella Sokolova et al. 2002, incertae sedis
           23 Genus Dethiosulfatibacter Takii et al. 2007, incertae sedis
           24 Genus Finegoldia Murdoch and Shah 2000, incertae sedis
           25 Genus Flavonifractor Carlier et al. 2010, incertae sedis
           26 Genus Fusibacter Ravot et al. 1999, incertae sedis
           27 Genus Gallicola Ezaki et al. 2001, incertae sedis
           28 Genus Guggenheimella Wyss et al. 2005, incertae sedis
           29 Genus Helcococcus Collins et al. 1993, incertae sedis
           30 Genus Howardella Cook et al. 2007, incertae sedis
           31 Genus Intestinimonas Kläring et al. 2013, incertae sedis
           32 Genus Mogibacterium Nakazawa et al. 2000, incertae sedis
           33 Genus Murdochiella Ulger-Toprak et al. 2010, incertae sedis
           34 Genus Natranaerovirga Sorokin et al. 2012, incertae sedis
           35 Genus Parvimonas Tindall and Euzéby 2006, incertae sedis
           36 Genus Peptoniphilus Ezaki et al. 2001, incertae sedis
           37 Genus Proteiniborus Niu et al. 2008, incertae sedis
           38 Genus Proteocatella Pikuta et al. 2009, incertae sedis
           39 Genus Pseudoflavonifractor Carlier et al. 2010, incertae sedis
           40 Genus Sedimentibacter Breitenstein et al. 2002, incertae sedis
           41 Genus Soehngenia Parshina et al. 2003, incertae sedis
           42 Genus Sporanaerobacter Hernandez-Eugenio et al. 2002, incertae sedis
           43 Genus Sulfobacillus Golovacheva and Karavaiko 1991, incertae sedis
           44 Genus Symbiobacterium Ohno et al. 2000, incertae sedis
           45 Genus Thermaerobacter Takai et al. 1999, incertae sedis
           46 Genus Tissierella Collins and Shah 1986, incertae sedis