Name: Epsilobacteria Cavalier-Smith 2002

Category: Class

Proposed as: class. nov.

Etymology: Gr. neut. n. epsilon, the letter e (indeclinable); N.L. neut. pl. n. bacteria, plural of bacterium; N.L. neut. pl. n. Epsilobacteria, name proposed to formalize the customary designation of most members of the class as ε-proteobacteria (not formed from a genus name)

Gender: neuter

Type order: Aquificales Reysenbach 2002

Valid 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.

IJSEM list: Anonymous. Notification list. Notification that new names and new combinations have appeared in volume 52, part 1 of the IJSEM. Int J Syst Evol Microbiol 2002; 52:293-295.

Nomenclatural status: validly published under the ICNP, rejected name

Taxonomic status: synonym

Correct name: Aquificia corrig. Reysenbach 2002

• Synonyms:

  • Name	Kind
    Aquificae Reysenbach 2002	homotypic synonym, inaccurate spelling
    Thermosulfidibacteria Chuvochina et al. 2024	heterotypic synonym, validly published under the ICNP
    Desulfurobacteriia Chuvochina et al. 2024	heterotypic synonym, validly published under the ICNP
    Aquificia corrig. Reysenbach 2002	homotypic synonym, validly published under the ICNP
    "Aquificia" Cavalier-Smith 2020	homotypic synonym, not validly published

• Notes:
  • 🧕 Cavalier-Smith (2002) assigned this class to the subdivision "Thiobacteria" 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.
  • 🧕 Cavalier-Smith (2002) assigned this class to the subphylum "Thiobacteria" Cavalier-Smith 1998. 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.
  • 🧒 Cavalier-Smith (2002) assigned the genus Aquifex Huber and Stetter 1992 to this class. 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.
  • 🧒 Cavalier-Smith (2002) assigned the genus Hydrogenobacter Kawasumi et al. 1984 to this class. 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.
  • 🧒 Cavalier-Smith (2002) assigned the genus Helicobacter Goodwin et al. 1989 to this class. 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.
  • 🛺 The type order of this class has been placed in the class Aquificia corrig. Reysenbach 2002. Publication: Reysenbach A-L. Order I. Aquificales ord. nov. In: Boone DR, Castenholz RW, Garrity GM (eds), Bergey's Manual of Systematic Bacteriology, 2nd edn, vol. 1 (The Archaea and the Deeply Branching and Phototrophic Bacteria), Springer, New York, 2001, p. 359-367.
  • 🙄 This taxon name is occasionally misprinted (or affected by an OCR error) in some sources as: "Epislonbacteria".
  • 🧍 The type order "Aquificales" Reysenbach 2001 does not appear on the Approved Lists of Bacterial Names, and was not validly published when Cavalier-Smith proposed the class Epsilobacteria (January 14, 2002). The order Aquificales Reysenbach 2002 (previously known as "Aquificales" Reysenbach 2001) was validly published in the May 2002 issue of the IJSEM (Validation List no. 85). Consequently, Epsilobacteria Cavalier-Smith 2002 is illegitimate. Validation List no. 85 in IJSEM Online. Publication: Skerman VBD, McGowan V, Sneath PHA. Approved lists of bacterial names. Int J Syst Bacteriol 1980; 30:225-420.
  • 🧍 This name was mentioned in a Request for an Opinion, which discussed its formation. Publication: Goker M. Solving the remaining problems with names of classes. Request for an Opinion. Int J Syst Evol Microbiol 2022; 72:5605.
  • 🧍 Irregularly formed name (not formed from the stem of the name of the nomenclatural type). Name of the type order "Aquificales" Reysenbach 2001 is not validly published. Rejected Name (Judicial Commission, Opinion 79 suppl.; IJSEM 64: 3599–3602). Publication: Tindall BJ. Names at the rank of class, subclass and order, their typification and current status: Supplementary information to Opinion 79. Judicial Commission of the International Committee on Systematics of Prokaryotes. Int J Syst Evol Microbiol 2014; 64:3599-3602.

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Record number: 34