Parachlamydia Everett et al. 1999 Parachlamydia acanthamoebae Everett et al. 1999 emend. García-López et al. 2019 Universal Root Woese et al. 1990 Bacteria (None 2015) Woese et al. 1990 Chlamydiota corrig. Garrity and Holt 2021 Chlamydiae (sic) Garrity and Holt 2021 non Chlamydiae Cavalier-Smith 2002 Chlamydiia (Cavalier-Smith 2002) Horn 2016 emend. Gupta et al. 2015 Parachlamydiales Gupta et al. 2016 Parachlamydiaceae Everett et al. 1999 Parachlamydia Everett et al. 1999 Parachlamydiaceae Everett et al. 1999 Neochlamydia Horn et al. 2001 Protochlamydia Horn 2010 Mesochlamydia Corsaro et al. 2013 Metachlamydia Corsaro et al. 2010 Parachlamydia acanthamoebae Everett et al. 1999 emend. García-López et al. 2019 Everett K.D.E. Bush R.M. Andersen A.A. Emended description of the order Chlamydiales, proposal of Parachlamydiaceae fam. nov. and Simkaniaceae fam. nov., each containing one monotypic genus, revised taxonomy of the family Chlamydiaceae, including a new genus and five new species, and standards for the identification of organisms. 1999 49 2 415 440 International Journal of Systematic Bacteriology Int J Syst Bacteriol 0020-7713 10.1099/00207713-49-2-415 10319462