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 stat. inval.
     Kingdom Bacteria Cavalier-Smith 1998 nom. inval. [paraphyletic] - bacteria see Kingdom Bacteria Cavalier-Smith 2002 stat. inval.
       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 stat. inval.
           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 stat. inval.
               Infraphylum Endobacteria T. Cavalier-Smith 1998 see Phylum Firmicutes (Gibbons and Murray 1978) Garrity and Holt 2001 stat. inval.
                 Class Mollicutes Edward and Freundt 1967 (Approved Lists 1980)
                   Genus Mycoplasma Nowak 1929 (Approved Lists 1980) nom. cons.
                     Mycoplasma genitalium Tully et al. 1983