[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   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 Chlamydiaceae Rake 1957 (Approved Lists 1980)
             Genus Chlamydophila Everett et al. 1999
               Chlamydophila psittaci (Lillie 1930) Everett et al. 1999