Name: Epsilonproteobacteria Garrity et al. 2006

Category: Class

Proposed as: class. nov.

Etymology: Ep.si.lon.pro.te.o.bac.te’ri.a. Gr. neut. n. epsilon, name of the fifth letter of Greek alphabet (indeclinable); Gr. masc. n. Prôteus, Greek god of the sea, capable of assuming many different shapes; N.L. neut. pl. n. bacteria, plural of bacterium; N.L. neut. pl. n. Epsilonproteobacteria, a class of bacteria included in the phylum Proteobacteria and having 16S rRNA gene sequences related to those of the members of the order Campylobacterales (not formed from a genus name)

Pronunciation (Latin), gender: ep-si-lon-pro-te-o-bak-TE-ri-a, neuter

Type genus: Campylobacter Sebald and Véron 1963 (Approved Lists 1980)

Effective publication: Garrity GM, Bell JA, Lilburn T. Class V. Epsilonproteobacteria class. nov. In: Brenner DJ, Krieg NR, Staley JT, Garrity GM (eds), Bergey's Manual of Systematic Bacteriology, 2nd edn, vol. 2 (The Proteobacteria), part C (The Alpha-, Beta-, Delta-, and Epsilonproteobacteria), Springer, New York, 2005, p. 1145. 🇺🇸

IJSEM list: Euzeby JP. Validation list no. 107. List of new names and new combinations previously effectively, but not validly, published. Int J Syst Evol Microbiol 2006; 56:1-6.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

• Synonyms:

  • Name	Kind
    "Nautiliia" Cavalier-Smith 2020	heterotypic synonym, not validly published
    "Campylobacteria" Waite et al. 2017	homotypic synonym, not validly published

• Notes:
  • 🧕 Brenner et al. (2005) assigned this class to the phylum "Proteobacteria" Garrity et al. 2005. Publication: Garrity GM, Bell JA, Lilburn T. Class III. Gammaproteobacteria class. nov. In: Brenner DJ, Krieg NR, Staley JT, Garrity GM (eds), Bergey's Manual of Systematic Bacteriology, 2nd edn, vol. 2 (The Proteobacteria), part B (The Gammaproteobacteria), Springer, New York, 2005, p. 1. 🇺🇸
  • 🧕 Cavalier-Smith (2006) assigned this class to the subphylum "Thiobacteria" Cavalier-Smith 1998. Publication: Cavalier-Smith T. Rooting the tree of life by transition analyses. Biol Direct 2006; 1:19. 🇬🇧
  • 🚃 The type genus of this class has alternatively been placed in the class "Nautiliia" 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. 🇬🇧
  • 🙄 This taxon name is occasionally misprinted (or affected by an OCR error) in some sources as: "Episilonproteobacteria"; "Epsiwnproteobacteria"; "Espilonproteobacteria". — 🤨 This taxon name is occasionally used in singular form as: "Epsilonproteobacterium".
  • 🧔 This taxon was discussed in a meeting of a Taxonomic Subcommittee of the ICSP. Publication: On SLW. International Committee on Systematics of Prokaryotes (ICSP) Subcommittee on the Taxonomy of Campylobacter and related bacteria: minutes of the closed meetings, 17 January and 31 January 2024. Int J Syst Evol Microbiol 2025; 75:6618. 🇳🇿
  • 🎰 The BRCs most frequently used for deposits in this group are: LMG: 163; DSM: 162; CCUG: 143; ATCC: 90; CIP: 73; JCM: 69; NCTC: 66; CECT: 47; KCTC: 33; MCCC: 24.
  • 🧍 Irregularly formed name (not formed from the stem of the name of the nomenclatural type). Publication: Oren A, Arahal DR, Christensen H, Goker M, Manaia CM, Moore ERB. International Code of Nomenclature of Prokaryotes. Prokaryotic Code (2025 Revision). Int J Syst Evol Microbiol 2026; 76:6979. 🇮🇱
  • 🧍 Nomenclatural type changed from Campylobacterales Garrity et al. 2006 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. 🇮🇱
  • 🧍 This name was mentioned in a Request for an Opinion. Rule 8 of the 2022 revision of the ICNP does not require that the name of a class validly published before 1 January 2012 be formed from the stem of the name of the type genus of the type order of the class plus the ending ia. This class name is orthographically correct (nominative plural noun, not formed from the name of the nomenclatural type). Publication: Goker M. Solving the remaining problems with names of classes. Request for an Opinion. Int J Syst Evol Microbiol 2022; 72:5605. 🇩🇪

Subdivision:

Number of child taxa with a validly published and correct name: 2
Number of child taxa with a validly published name, including synonyms: 2
Total number of child taxa: 3

• Child taxa:

  • Name	Nomenclatural status	Taxonomic status
    Campylobacterales Garrity et al. 2006	validly published under the ICNP	correct name
    [Epsilonproteobacteria, not assigned to order]	artificial parent node of taxa incertae sedis
    Nautiliales Miroshnichenko et al. 2004	validly published under the ICNP	correct name

Parent taxon: Pseudomonadota Garrity et al. 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: 35