Name: Chlamydiia Horn 2016

Category: Class

Proposed as: class. nov.

Etymology: Chla.my’dii.a. N.L. fem. pl. n. Chlamydiales, type order of the class; N.L. neut. pl. n. Chlamydiia, the Chlamydiales class

Gender: neuter

Type genus: Chlamydia Jones et al. 1945 (Approved Lists 1980)

Effective publication: Horn M. Class I. Chlamydiia class. nov. In: Krieg NR, Staley JT, Brown DR, Hedlund BP, Paster BJ, Ward NL, Ludwig W, Whitman WB (eds), Bergey's Manual of Systematic Bacteriology, 2nd Edn, Vol. 4, Springer, New York, 2010, p. 844.

IJSEM list: Oren A, Garrity GM. Validation list no. 170. List of new names and new combinations previously effectively, but not validly, published. Int J Syst Evol Microbiol 2016; 66:2463-2466.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

• Synonyms:

  • Name	Kind
    Chlamydiae Cavalier-Smith 2002	homotypic synonym, validly published under the ICNP, rejected name

• Emendations:
  • Gupta et al. 2015 Gupta RS, Naushad S, Chokshi C, Griffiths E, Adeolu M. A phylogenomic and molecular markers based analysis of the phylum Chlamydiae: proposal to divide the class Chlamydiia into two orders, Chlamydiales and Parachlamydiales ord. nov., and emended description of the class Chlamydiia. Antonie Van Leeuwenhoek 2015; 108:765-781. Oren A, Garrity GM. Validation list no. 170. List of new names and new combinations previously effectively, but not validly, published. Int J Syst Evol Microbiol 2016; 66:2463-2466.
    Notes:
    • Emendation accompanied by the inclusion of 2 orders in the class.
    • The emendation has triggered the validation, hence the anomaly of the years.

• Notes:
  • Cavalier-Smith and Chao (2020) assigned this class to the infraphylum "Chlamydiia" Cavalier-Smith 2020. Publication: Cavalier-Smith T, Chao EE. Multidomain ribosomal protein trees and the planctobacterial origin of neomura (eukaryotes, archaebacteria). Protoplasma 2020; 257:621-753.
  • Gupta et al. (2015) assigned this class to the phylum "Chlamydiae" Garrity and Holt 2001. Publication: Gupta RS, Naushad S, Chokshi C, Griffiths E, Adeolu M. A phylogenomic and molecular markers based analysis of the phylum Chlamydiae: proposal to divide the class Chlamydiia into two orders, Chlamydiales and Parachlamydiales ord. nov., and emended description of the class Chlamydiia. Antonie Van Leeuwenhoek 2015; 108:765-781.
  • Gupta et al. (2015) assigned the order Parachlamydiales Gupta et al. 2016 to this class. Publication: Gupta RS, Naushad S, Chokshi C, Griffiths E, Adeolu M. A phylogenomic and molecular markers based analysis of the phylum Chlamydiae: proposal to divide the class Chlamydiia into two orders, Chlamydiales and Parachlamydiales ord. nov., and emended description of the class Chlamydiia. Antonie Van Leeuwenhoek 2015; 108:765-781.
  • Krieg et al. (2010) assigned the genus Chlamydia Jones et al. 1945 (Approved Lists 1980) to this class. Publication: Horn M. Class I. Chlamydiia class. nov. In: Krieg NR, Staley JT, Brown DR, Hedlund BP, Paster BJ, Ward NL, Ludwig W, Whitman WB (eds), Bergey's Manual of Systematic Bacteriology, 2nd Edn, Vol. 4, Springer, New York, 2010, p. 844.
  • The type genus of this class has alternatively been placed in the class Chlamydiae Cavalier-Smith 2002. Publication: Cavalier-Smith T. The neomuran origin of archaebacteria, the negibacterial root of the universal tree and bacterial megaclassification. Int J Syst Evol Microbiol 2002; 52:7-76.
  • This taxon was discussed in a meeting of a Taxonomic Subcommittee of the ICSP. Publication: Borel N, Greub G. International Committee on Systematics of Prokaryotes (ICSP) Subcommittee on the taxonomy of Chlamydiae. Minutes of the closed meeting, 5 July 2018, Woudschoten, Zeist, The Netherlands. Int J Syst Evol Microbiol 2019; 69:2606-2608.
  • This taxon was discussed in a meeting of a Taxonomic Subcommittee of the ICSP. Publication: Borel N, Horn M, Greub G. International Committee on Systematics of Prokaryotes (ICSP) Subcommittee on the taxonomy of Chlamydiae. Minutes of the closed meeting, 20 March 2019, Seattle, WA, USA. Int J Syst Evol Microbiol 2019; 69:3654-3656.
  • This taxon was discussed in a meeting of a Taxonomic Subcommittee of the ICSP. Publication: Borel N, Greub G. International Committee on Systematics of Prokaryotes Subcommittee on the taxonomy of Chlamydiae: Minutes of the closed meeting, March 20, Meeting of the Chlamydia Research Society, Omaha, NE, USA. International Journal of Systematic and Evolutionary Microbiology 2023; 73:0.
  • This taxon was discussed in a meeting of a Taxonomic Subcommittee of the ICSP. Publication: Borel N, Greub G, For The Icsp Subcommittee On The Taxonomy Of Chlamydiae. International Committee on Systematics of Prokaryotes Subcommittee on the taxonomy of Chlamydiae: Minutes of the closed meeting, March 20, Meeting of the Chlamydia Research Society, Omaha, NE, USA. Int J Syst Evol Microbiol 2023; 73:6004.
  • The BRCs most frequently used for deposits in this group are: DSM: 23; ATCC: 22.
  • Nomenclatural type changed from Chlamydiales Storz and Page 1971 (Approved Lists 1980) based on new Rule 22. Publication: Oren A. Emendation of Rules 8, 15, 22, 25a, 30(3)(b), 30(4), 34a, and Appendix 7 of the International Code of Nomenclature of Prokaryotes. Int J Syst Evol Microbiol 2023; 73:6070.
  • This name was mentioned in a Request for an Opinion. Publication: Oren A, Parte A, Garrity GM. Implementation of Rule 8 of the International Code of Nomenclature of Prokaryotes for the renaming of classes. Request for an Opinion. Int J Syst Evol Microbiol 2016; 66:4296-4298.

Subdivision:

Number of child taxa with a validly published and correct name: 1
Number of child taxa with a validly published name, including synonyms: 1
Total number of child taxa: 1

• Child taxa:

  • Name	Nomenclatural status	Taxonomic status
    Chlamydiales Storz and Page 1971 (Approved Lists 1980)	validly published under the ICNP	correct name

Parent taxon: Chlamydiota Garrity and Holt 2021

Assigned by: Oren A, Garrity GM. Valid publication of the names of forty-two phyla of prokaryotes. Int J Syst Evol Microbiol 2021; 71:5056.

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Record number: 20