prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   Domain "Bacteria" Woese et al. 1990
     Phylum "Chlamydiae" Garrity and Holt 2012 [monotypic]
       Class Chlamydiae Cavalier-Smith 2002 [monotypic]
         Order Chlamydiales Storz and Page 1971 (Approved Lists 1980)
           1 Family Chlamydiaceae Rake 1957 (Approved Lists 1980)
           2 Family Parachlamydiaceae Everett et al. 1999
           3 Family Simkaniaceae Everett et al. 1999 [monotypic]
           4 Family Waddliaceae Rurangirwa et al. 1999 [monotypic]