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 Mollicutes Edward and Freundt 1967 (Approved Lists 1980)
         Order Entomoplasmatales Tully et al. 1993 see Order Mycoplasmatales Freundt 1955 (Approved Lists 1980)
           Family Spiroplasmataceae (ex Skripal' 1974) Skripal' 1983 [monotypic]
             1 Genus Spiroplasma Saglio et al. 1973 (Approved Lists 1980)