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 Anaeroplasmatales Robinson and Freundt 1987
         ?Family "Erysipelotrichaceae" nom. inval. see Family Erysipelotrichaceae Verbarg et al. 2004
           Genus Holdemania Willems et al. 1997
           1 Genus Erysipelothrix Rosenbach 1909 (Approved Lists 1980)