Domain Bacteria Woese et al. 1990
   Phylum Chlamydiae Garrity and Holt 2001 see Phylum Chlamydiae Garrity and Holt 2012
     Class "Chlamydiae" Cavalier-Smith, 2002 see Class Chlamydiae Cavalier-Smith 2002
       Order Chlamydiales Storz and Page 1971 (Approved Lists 1980)
         Family Waddliaceae Rurangirwa et al. 1999
           1 Genus Waddlia Rurangirwa et al. 1999