life see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Empire Prokaryota (Dougherty 1957) Allsopp 1969 [monotypic] see Domain Bacteria Woese et al. 1990
     Kingdom Bacteria (Cohn 1870) Cavalier-Smith 1983 [paraphyletic] - bacteria see Kingdom Bacteria Cavalier-Smith 2002
       Subkingdom Unibacteria Cavalier-Smith 1998 [paraphyletic?] see Subkingdom Unibacteria Cavalier-Smith 2002
         Infrakingdom Posibacteria (Cavalier-Smith 1987) Cavalier-Smith 1998 [monotypic] see Domain Bacteria Woese et al. 1990
           Phylum Posibacteria Cavalier-Smith 1987 [paraphyletic?] see Phylum Posibacteria Cavalier-Smith 1987 ex Cavalier-Smith 2002
             Subphylum Teichobacteria Cavalier-Smith 1998 see Domain Bacteria Woese et al. 1990
               Infraphylum Endobacteria T. Cavalier-Smith 1998 see Phylum Firmicutes corrig. Gibbons and Murray 1978 (Approved Lists 1980)
                 1 Class Clostridea Cavalier-Smith 1982 see Class Clostridia Garrity et al. 2001 nom. ined.
                 2 Class Mollicutes Edward and Freundt 1967 (Approved Lists 1980)