prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   Domain "Bacteria" Woese et al. 1990
     Phylum "Tenericutes" Murray 1984 [monotypic] see Phylum Firmicutes corrig. Gibbons and Murray 1978 (Approved Lists 1980)
       Class Mollicutes Edward and Freundt 1967 (Approved Lists 1980)
         Order Mycoplasmatales Freundt 1955 (Approved Lists 1980) [monotypic]
           Family Mycoplasmataceae Freundt 1955 (Approved Lists 1980)
             Genus Ureaplasma Shepard et al. 1974 (Approved Lists 1980)