Procaryotic Genera
   Domain "Bacteria" Woese et al. 1990
     Phylum Firmicutes corrig. Gibbons and Murray 1978 (Approved Lists 1980)
       Class Mollicutes Edward and Freundt 1967 (Approved Lists 1980)
         Order Entomoplasmatales Tully et al. 1993
           Family Spiroplasmataceae (ex Skripal' 1974) Skripal' 1983 [monotypic]
             Genus Spiroplasma Saglio et al. 1973 (Approved Lists 1980)