Name: Megasphaera Rogosa 1971 (Approved Lists 1980)

Category: Genus

Proposed as: gen. nov.

Etymology: Me.ga.sphae’ra. Gr. masc. adj. megas, big; Gr. fem. n. sphaîra, a sphere; N.L. fem. n. Megasphaera, big sphere

Gender, pronunciation (Latin): feminine (stem: Megasphaer-), me-ga-SP^HA͡E-ra

Type species: Megasphaera elsdenii (Gutiérrez et al. 1959) Rogosa 1971 (Approved Lists 1980)

Conduct genome-based taxonomy of genus at TYGS

16S rRNA gene: Analyse FASTA

Effective publication: Rogosa M. Transfer of Peptostreptococcus elsdenii Gutierrez et al. to a new genus, Megasphaera [M. elsdenii (Gutierrez et al) comb. nov.]. International Journal of Systematic Bacteriology 1971; 21:187-189.

IJSEM list: Skerman VBD, McGowan V, Sneath PHA. Approved lists of bacterial names. Int J Syst Bacteriol 1980; 30:225-420.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

Risk group: 2

• Synonyms:

  • Name	Kind
    "Caecibacter" Ricaboni et al. 2017	heterotypic synonym, not validly published
    "Colibacter" Mailhe et al. 2017	heterotypic synonym, not validly published
    Anaeroglobus Carlier et al. 2002	heterotypic synonym, validly published under the ICNP

• Emendations:
  • Marchandin et al. 2003 Marchandin H, Jumas-Bilak E, Gay B, Teyssier C, Jean-Pierre H, de Buochberg MS, Carriere C, Carlier JP. Phylogenetic analysis of some Sporomusa sub-branch members isolated from human clinical specimens: description of Megasphaera micronuciformis sp. nov. Int J Syst Evol Microbiol 2003; 53:547-553. 🇫🇷 Euzeby JP. Notification list. Notification that new names and new combinations have appeared in volume 53, part 2 of the IJSEM. Int J Syst Evol Microbiol 2003; 53:939-940.
    Notes:
    • ⊕ Emendation accompanied by the proposal of 1 new species in the genus.
    • 🧍 In the Tables of Contents (IJSEM, 2003, 53, part 2, page I) and in the file "Author Index" (IJSEM, 2003, 53, part 2, page V), the author's name M. Siméon de Buochberg is erroneously cited as M.S. de Buochberg.

• Notes:
  • 🥇 Nomenclatural type of the family Megasphaeraceae Chuvochina et al. 2024. Publication: Chuvochina M, Mussig AJ, Chaumeil PA, Skarshewski A, Rinke C, Parks DH, Hugenholtz P. Proposal of names for 329 higher rank taxa defined in the Genome Taxonomy Database under two prokaryotic codes. FEMS Microbiol Lett 2023; 0:0. 🇦🇺
  • 🧕 Boone et al. (2001) assigned this genus to the family "Acidaminococcaceae". Publication: 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. 🇺🇸
  • 🧕 Chuvochina et al. (2023) assigned this genus to the family Megasphaeraceae Chuvochina et al. 2024. Publication: Chuvochina M, Mussig AJ, Chaumeil PA, Skarshewski A, Rinke C, Parks DH, Hugenholtz P. Proposal of names for 329 higher rank taxa defined in the Genome Taxonomy Database under two prokaryotic codes. FEMS Microbiol Lett 2023; 0:0. 🇦🇺
  • 🧕 Marchandin et al. (2010) assigned this genus to the order Selenomonadales Marchandin et al. 2010. 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 species of this genus has alternatively been placed in the genus Peptostreptococcus Kluyver and van Niel 1936 (Approved Lists 1980). Publication: Gutierrez J, Davis RE, Lindahl IL, Warwick EJ. Bacterial changes in the rumen during the onset of feed-lot bloat of cattle and characteristics of Peptostreptococcus elsdenii n. sp. Appl Microbiol 1959; 7:16-22.
  • 🙄 This taxon name is occasionally misprinted (or affected by an OCR error) in some sources as: "Hegasphaera"; "Mcgasphaera"; "Medgasphaera"; "Megapsphaera"; "Megaspaera"; "Megaspahaera"; "Megaspheara"; "Megasphera"; "Megsphaera".
  • 🎰 The BRCs most frequently used for deposits in this group are: DSM: 16; ATCC: 5; JCM: 4; CCUG: 4; CIP: 3; CSUR: 2; VTT: 2; LMG: 2; MCC: 1; KCTC: 1.
  • 😷 The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 2, note = "Animal classification RG: 1 - Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No - Containment level: Containment Level 2". — If in doubt, use the risk group given in the regulations for your country and, if these are not available, use the risk group given in the catalogue of the culture collection from which you have obtained or intend to obtain the strain.
  • 🧍 Pittman et al. (1991) suggested the abbreviation "MGSF" 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: 16
Number of child taxa with a validly published name, including synonyms: 18
Total number of child taxa: 19

• Child taxa:

  • Name	Nomenclatural status	Taxonomic status
    Megasphaera butyrica Hitch et al. 2022	validly published under the ICNP	synonym
    Megasphaera cerevisiae Engelmann and Weiss 1986	validly published under the ICNP	correct name
    Megasphaera coli Heng et al. 2025	validly published under the ICNP	correct name
    Megasphaera elsdenii (Gutiérrez et al. 1959) Rogosa 1971 (Approved Lists 1980)	validly published under the ICNP	correct name
    Megasphaera geminata (Carlier et al. 2002) Heng et al. 2025	validly published under the ICNP	correct name
    Megasphaera hexanoica Jeon et al. 2017	validly published under the ICNP	correct name
    Megasphaera hominis Liu et al. 2022	validly published under the ICNP	correct name
    Megasphaera hutchinsoni Srinivasan et al. 2021	validly published under the ICNP	correct name
    Megasphaera indica Lanjekar et al. 2014	validly published under the ICNP	correct name
    Megasphaera intestinihominis Hitch et al. 2025	validly published under the ICNP	synonym
    Megasphaera jansseni Heng et al. 2025	validly published under the ICNP	correct name
    Megasphaera lornae Srinivasan et al. 2021	validly published under the ICNP	correct name
    Megasphaera massiliensis Padmanabhan et al. 2016	validly published under the ICNP	correct name
    Megasphaera micronuciformis Marchandin et al. 2003	validly published under the ICNP	correct name
    Megasphaera paucivorans Juvonen and Suihko 2006	validly published under the ICNP	correct name
    Megasphaera stantonii Maki and Looft 2018	validly published under the ICNP	correct name
    Megasphaera sueciensis Juvonen and Suihko 2006	validly published under the ICNP	correct name
    Megasphaera vaginalis Srinivasan et al. 2021	validly published under the ICNP	correct name
    "Megasphaera vaginalis" Bordigoni et al. 2020	not validly published	preferred name

Parent taxon: Veillonellaceae Rogosa 1971 (Approved Lists 1980)

Assigned by: Campbell C, Adeolu M, Gupta RS. Genome-based taxonomic framework for the class Negativicutes: division of the class Negativicutes into the orders Selenomonadales emend., Acidaminococcales ord. nov. and Veillonellales ord. nov. Int J Syst Evol Microbiol 2015; 65:3203-3215. 🇨🇦

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Record number: 516031