prokaryotes - bacteria see Domain Bacteria Woese et al. 1990 stat. inval.
   Domain "Bacteria" Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum "Chlamydiae" Garrity and Holt 2012 stat. inval. [monotypic] see Phylum Chlamydiota Garrity and Holt 2021
       Class Chlamydiae Cavalier-Smith 2002 nom. rej. [monotypic]
         Order Chlamydiales Storz and Page 1971 (Approved Lists 1980)
           Family Parachlamydiaceae Everett et al. 1999
             1 Genus Neochlamydia Horn et al. 2001 nom. inval., sedis mutabilis
             2 Genus Parachlamydia Everett et al. 1999, sedis mutabilis