[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   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 Mycoplasmatales Freundt 1955 (Approved Lists 1980)
           Family Mycoplasmataceae Freundt 1955 (Approved Lists 1980)
             Genus Ureaplasma Shepard et al. 1974 (Approved Lists 1980)
               1 Ureaplasma urealyticum Shepard et al. 1974 (Approved Lists 1980)
               2 Ureaplasma canigenitalium Harasawa et al. 1993
               3 Ureaplasma cati Harasawa et al. 1990
               4 Ureaplasma diversum Howard and Gourlay 1982
               5 Ureaplasma felinum Harasawa et al. 1990
               6 Ureaplasma gallorale Koshimizu et al. 1987
               7 Ureaplasma parvum Robertson et al. 2002