procaryotes
   Domain Bacteria Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum Firmicutes (Gibbons and Murray 1978) Garrity and Holt 2001 stat. inval. see Phylum Bacillota Gibbons and Murray 2021
       Class "Clostridia" "Garrity and Holt 2001" nom. nud. see Class Clostridia Rainey 2010
         Order Clostridiales Prévot 1953 (Approved Lists 1980) see Order Eubacteriales Buchanan 1917 (Approved Lists 1980)
           Family Clostridiaceae Pribram 1933 (Approved Lists 1980)
             01 Genus Clostridium Prazmowski 1880 (Approved Lists 1980)
             02 Genus Acetivibrio Patel et al. 1980
             03 Genus Acidaminobacter Stams and Hansen 1985
             04 Genus Anaerobacter Duda et al. 1996 see Genus Clostridium Prazmowski 1880 (Approved Lists 1980)
             05 Genus Caloramator Collins et al. 1994
             06 Genus Natronincola corrig. Zhilina et al. 1999
             07 Genus Oxobacter Collins et al. 1994
             08 Genus Sarcina Goodsir 1842 (Approved Lists 1980)
             09 Genus Sporobacter Grech-Mora et al. 1996
             10 Genus Thermobrachium Engle et al. 1996
             11 Genus Tindallia Kevbrin et al. 1999