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)
       1 Order Mycoplasmatales Freundt 1955 (Approved Lists 1980)
       2 Order Entomoplasmatales Tully et al. 1993
       3 Order Acholeplasmatales Freundt et al. 1984
       4 Order Anaeroplasmatales Robinson and Freundt 1987