Name: Negativicutes Marchandin et al. 2010

Category: Class

Proposed as: class. nov.

Etymology: Ne.ga.ti.vi’cu.tes. L. masc. adj. negativus, negative; L. gen. fem. n. cutis, skin (gen. cutis); L. fem. pl. n. cutes, skins; N.L. fem. pl. n. Negativicutes, division with cells bounded by skin with two concentric lipid bilayers, the cytoplasmic membrane and an outer membrane, to indicate Gram-negative type of cell wall in the Firmicutes division (phylum), not derived from a genus name

Pronunciation (Latin), gender: ne-ga-ti-WI-ku-tes, feminine

Type genus: Selenomonas von Prowazek 1913 (Approved Lists 1980)

Valid publication: Marchandin H, Teyssier C, Campos J, Jean-Pierre H, Roger F, Gay B, Carlier JP, Jumas-Bilak E. Negativicoccus succinicivorans gen. nov., sp. nov., isolated from human clinical samples, emended description of the family Veillonellaceae and description of Negativicutes classis nov., Selenomonadales ord. nov. and Acidaminococcaceae fam. nov. in the bacterial phylum Firmicutes. Int J Syst Evol Microbiol 2010; 60:1271-1279. 🇫🇷

IJSEM list: Euzeby JP. Notification list. Notification that new names and new combinations have appeared in volume 60, part 6 of the IJSEM. Int J Syst Evol Microbiol 2010; 60:1987-1988.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

• Synonyms:

  • Name	Kind
    "Selenobacteria" Cavalier-Smith 2006	heterotypic synonym, not validly published
    "Selenomonadia" Cavalier-Smith 2020	homotypic synonym, not validly published

• Notes:
  • 🧕 Marchandin et al. (2010) assigned this class to the phylum "Firmicutes" (Gibbons and Murray 1978) Garrity and Holt 2001. Publication: Marchandin H, Teyssier C, Campos J, Jean-Pierre H, Roger F, Gay B, Carlier JP, Jumas-Bilak E. Negativicoccus succinicivorans gen. nov., sp. nov., isolated from human clinical samples, emended description of the family Veillonellaceae and description of Negativicutes classis nov., Selenomonadales ord. nov. and Acidaminococcaceae fam. nov. in the bacterial phylum Firmicutes. Int J Syst Evol Microbiol 2010; 60:1271-1279. 🇫🇷
  • 🚃 The type genus of this class has alternatively been placed in the class Togobacteria 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. 🇬🇧
  • 🚃 The type genus of this class has alternatively been placed in the class "Halanaerobiia" 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: "Negatiyicutes".
  • 😢 The terminology used by the authors is in line with many other taxonomic studies and does not negatively affect their main results; some improvements may nevertheless be possible. Using the term "phylogenetic data" (or equivalent) for sequence data is not advocated. Whether taxa can have "members" is debatable. See the LPSN phylogeny page for details. Publication: Göker M. What can genome analysis offer for bacteria? In: Bridge P, Smith D, Stackebrandt E (eds), Trends in the systematics of bacteria and fungi, CAB International, Wallingford, 2021, p. 255-281. 🇬🇧
  • 🎰 The BRCs most frequently used for deposits in this group are: DSM: 121; ATCC: 69; JCM: 49; CCUG: 30; CIP: 25; CSUR: 16; NCTC: 14; KCTC: 13; LMG: 8; VTT: 4.
  • 🧍 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 Selenomonadales Marchandin et al. 2010 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: 3
Number of child taxa with a validly published name, including synonyms: 5
Total number of child taxa: 6

• Child taxa:

  • Name	Nomenclatural status	Taxonomic status
    Acidaminococcales Campbell et al. 2015	validly published under the ICNP	correct name
    Anaeromusales Chuvochina et al. 2024	validly published under the ICNP	synonym
    Propionisporales Chuvochina et al. 2024	validly published under the ICNP	synonym
    Selenomonadales Marchandin et al. 2010	validly published under the ICNP	correct name
    "Sporomusales" Cavalier-Smith 2006	not validly published	synonym
    Veillonellales Campbell et al. 2015	validly published under the ICNP	correct name

Parent taxon: Bacillota Gibbons and Murray 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: 56