Genus Flavonifractor

Classification:

Bacteria Bacillati Bacillota Clostridia Eubacteriales Oscillospiraceae Flavonifractor

Name: Flavonifractor Carlier et al. 2010

Category, proposed as: genus, gen. nov.

Etymology: Fla.vo.ni.frac’tor. N.L. neut. n. flavonum, flavone; L. masc. n. fractor, breaker; N.L. masc. n. Flavonifractor, flavone-breaker

Gender, pronunciation (Latin): masculine (stem: Flavonifractor-), fla-wo-ni-FRAK-tor

Type species: Flavonifractor plautii (Séguin 1928) Carlier et al. 2010

Conduct genome-based taxonomy of genus at TYGS

16S rRNA gene: Analyse FASTA

Valid publication: Carlier JP, Bedora-Faure M, K'ouas G, Alauzet C, Mory F. Proposal to unify Clostridium orbiscindens Winter et al. 1991 and Eubacterium plautii (Seguin 1928) Hofstad and Aasjord 1982, with description of Flavonifractor plautii gen. nov., comb. nov., and reassignment of Bacteroides capillosus to Pseudoflavonifractor capillosus gen. nov., comb. nov. Int J Syst Evol Microbiol 2010; 60:585-590. 🇫🇷

IJSEM list: Euzeby JP. Notification list. Notification that new names and new combinations have appeared in volume 60, part 3 of the IJSEM. Int J Syst Evol Microbiol 2010; 60:1253-1255.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

Risk group: 1

Notes:
- 🧕 Kläring et al. (2013) assigned this genus to the order Clostridiales Prévot 1953 (Approved Lists 1980). Publication: Klaring K, Hanske L, Bui N, Charrier C, Blaut M, Haller D, Plugge CM, Clavel T. Intestinimonas butyriciproducens gen. nov., sp. nov., a butyrate-producing bacterium from the mouse intestine. Int J Syst Evol Microbiol 2013; 63:4606-4612. 🇩🇪
- 🚋 The type species of this genus has alternatively been placed in the genus Clostridium Prazmowski 1880 (Approved Lists 1980). Publication: Winter J, Popoff MR, Grimont P, Bokkenheuser VD. Clostridium orbiscindens sp. nov., a human intestinal bacterium capable of cleaving the flavonoid C-ring. Int J Syst Bacteriol 1991; 41:355-357.
- 🚋 The type species of this genus has alternatively been placed in the genus Eubacterium Prévot 1938 (Approved Lists 1980). Publication: Hofstad T, Aasjord P. Eubacterium plautii (Séguin 1928) comb. nov. Int. J. Syst. Bacteriol. 1982; 32:346-349.
- 🚋 The type species of this genus has alternatively been placed in the genus Fusobacterium Knorr 1922 (Approved Lists 1980). Publication: Séguin P. Culture du Fusobacterium plauti forme mobile du bacille fusiforme. Comptes Rendus des Séances de la Société de Biologie (Paris) 1928; 99:439-442.
- 🙄 This taxon name is occasionally misprinted (or affected by an OCR error) in some sources as: "Flavonifracto".
- 🎰 The BRCs most frequently used for deposits in this group are: DSM: 2; LMG: 1; KCTC: 1; ATCC: 1; CGMCC: 1; CCUG: 1.
- 😷 The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 1, note = "Animal classification RG: 1 - Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No - Containment level: Containment Level 1". — 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.

Subdivision:

Number of child taxa with a validly published and correct name: 3
Number of child taxa with a validly published name, including synonyms: 3
Total number of child taxa: 10

Child taxa:

Name	Nomenclatural status	Taxonomic status
"Candidatus Flavonifractor avicola" Gilroy et al. 2021	not validly published	pro-correct name
"Candidatus Flavonifractor avistercoris" Gilroy et al. 2021	not validly published	pro-correct name
Flavonifractor hominis Hitch et al. 2025	validly published under the ICNP	correct name
"Candidatus Flavonifractor intestinigallinarum" Gilroy et al. 2021	not validly published	pro-correct name
"Candidatus Flavonifractor intestinipullorum" Gilroy et al. 2021	not validly published	pro-correct name
"Candidatus Flavonifractor merdavium" Gilroy et al. 2021	not validly published	pro-correct name
"Candidatus Flavonifractor merdigallinarum" Gilroy et al. 2021	not validly published	pro-correct name
"Candidatus Flavonifractor merdipullorum" Gilroy et al. 2021	not validly published	pro-correct name
Flavonifractor plautii (Séguin 1928) Carlier et al. 2010	validly published under the ICNP	correct name
Flavonifractor porci Niu et al. 2025	validly published under the ICNP	correct name

Parent taxon: Oscillospiraceae Peshkoff 1940 (Approved Lists 1980)

Assigned by: Tindall BJ. The names Hungateiclostridium Zhang et al. 2018, Hungateiclostridium thermocellum (Viljoen et al. 1926) Zhang et al. 2018, Hungateiclostridium cellulolyticum (Patel et al. 1980) Zhang et al. 2018, Hungateiclostridium aldrichii (Yang et al. 1990) Zhang et al. 2018, Hungateiclostridium alkalicellulosi (Zhilina et al. 2006) Zhang et al. 2018, Hungateiclostridium clariflavum (Shiratori et al. 2009) Zhang et al. 2018, Hungateiclostridium straminisolvens (Kato et al. 2004) Zhang et al. 2018 and Hungateiclostridium saccincola (Koeck et al. 2016) Zhang et al. 2018 contravene Rule 51b of the International Code of Nomenclature of Prokaryotes and require replacement names in the genus Acetivibrio Patel et al. 1980. Int J Syst Evol Microbiol 2019; 69:3927-3932. 🇩🇪

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Record number: 517953

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