life see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Prokarya see Domain Bacteria Woese et al. 1990
     Kingdom Bacteria (Cohn 1870) Cavalier-Smith 1983 - bacteria see Kingdom Bacteria Cavalier-Smith 2002
       Subkingdom Eubacteria Cavalier-Smith 1981 see Domain Bacteria Woese et al. 1990
         Division Firmicutes corrig. Gibbons and Murray 1978 (Approved Lists 1980) - gram-positive bacteria see Phylum Firmicutes corrig. Gibbons and Murray 1978 (Approved Lists 1980)
           Phylum Endospora see Phylum Firmicutes corrig. Gibbons and Murray 1978 (Approved Lists 1980)
             Family Peptococcaceae Rogosa 1971 (Approved Lists 1980)
               1 Genus Peptococcus Kluyver and van Niel 1936 (Approved Lists 1980)
               2 Genus Peptostreptococcus Kluyver and van Niel 1936 (Approved Lists 1980)
               3 Genus Ruminococcus Sijpesteijn 1948 (Approved Lists 1980)