Name: Methanococcoides Sowers and Ferry 1985

Category: Genus

Proposed as: gen. nov.

Etymology: Me.tha.no.cocc.o.i’des. N.L. masc. n. Methanococcus, a bacterial genus name; L. adj. suff. -oides, ressembling, similar; from Gr. neut. adj. suff. -eides, resembling, similar; from Gr. neut. n. eîdos, that which is seen, form, shape, figure; N.L. neut. n. Methanococcoides, organism similar to Methanococcus

Gender, pronunciation: neuter (stem: Methanococcoid-), me-t^ha-no-kokk-o-I-des

Type species: Methanococcoides methylutens Sowers and Ferry 1985

Conduct genome-based taxonomy of genus at TYGS

16S rRNA gene: Analyse FASTA

Effective publication: Sowers KR, Ferry JG. Isolation and Characterization of a Methylotrophic Marine Methanogen, Methanococcoides methylutens gen. nov., sp. nov. Appl Environ Microbiol 1983; 45:684-690. 🇺🇸

IJSEM list: Anonymous. Validation list no. 17. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1985; 35:223-225.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

• Emendations:
  • L'Haridon et al. 2014 L'Haridon S, Chalopin M, Colombo D, Toffin L. Methanococcoides vulcani sp. nov., a marine methylotrophic methanogen that uses betaine, choline and N,N-dimethylethanolamine for methanogenesis, isolated from a mud volcano, and emended description of the genus Methanococcoides. Int J Syst Evol Microbiol 2014; 64:1978-1983. 🇫🇷 Oren A, Garrity GM. Notification list. Notification that new names and new combinations have appeared in volume 64, part 6 of the IJSEM. Int J Syst Evol Microbiol 2014; 64:2930-2931.
    Notes:
    • ⊕ Emendation accompanied by the proposal of 1 new species in the genus.

• Notes:
  • 🙄 This taxon name is occasionally misprinted (or affected by an OCR error) in some sources as: "Methanococcoidea"; "Methaococcoides".
  • 🖹 Minimal standards for the description of new taxa in this group were published in 2023. Publication: Prakash O, Dodsworth JA, Dong X, Ferry JG, L'Haridon S, Imachi H, Kamagata Y, Rhee SK, Sagar I, Shcherbakova V, et al. Proposed minimal standards for description of methanogenic archaea. Int J Syst Evol Microbiol 2023; 73:5500. 🇮🇳
  • 💁 Taxonomists who have recently focused on this group are the corresponding authors of Li et al. (2025). Editors in search of reviewers are advised to consider additional criteria such as whether a taxon is covered by one of the ICSP subcommittees.
  • 🎰 The BRCs most frequently used for deposits in this group are: DSM: 4; OCM: 3; NBRC: 2; JCM: 2; CGMCC: 2; ATCC: 1; MCCC: 1; KCTC: 1.
  • 🧍 Pittman et al. (1991) suggested the abbreviation "MECC" for this genus name but this does not appear to be of practical relevance any longer. Publication: Pittman KF, Walczak CA, Lock CM. Codes and abbreviations for approved of effectively published names of genera of bacteria published from January 1980 to December 1990. Int J Syst Bacteriol 1991; 41:571-579.

Subdivision:

Number of child taxa with a validly published and correct name: 6
Number of child taxa with a validly published name, including synonyms: 6
Total number of child taxa: 8

• Child taxa:

  • Name	Nomenclatural status	Taxonomic status
    Methanococcoides alaskense Singh et al. 2005	validly published under the ICNP	correct name
    Methanococcoides burtonii Franzmann et al. 1993	validly published under the ICNP	correct name
    Methanococcoides cohabitans Li et al. 2025	validly published under the ICNP	correct name
    "Methanococcoides euhalobius" Obraztsova et al. 1987	not validly published	preferred name
    Methanococcoides methylutens Sowers and Ferry 1985	validly published under the ICNP	correct name
    Methanococcoides orientis Liang et al. 2022	validly published under the ICNP	correct name
    "Methanococcoides seepicolus" Li et al. 2021	not validly published	preferred name
    Methanococcoides vulcani L'Haridon et al. 2014	validly published under the ICNP	correct name

Parent taxon: Methanosarcinaceae Balch and Wolfe 1981

Assigned by: Garrity GM, Holt JG. The Road Map to the Manual. In: Boone DR, Castenholz RW, Garrity GM (eds), Bergey's Manual of Systematic Bacteriology, second edition, vol. 1 (The Archaea and the deeply branching and phototrophic Bacteria), Springer-Verlag, New York, 2001, p. 119-166. 🇺🇸

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Record number: 517067