Species Clostridium nexile

Name: Clostridium nexile Holdeman and Moore 1974 (Approved Lists 1980)

Category: Species

Proposed as: sp. nov.

Etymology: ne’xi.le. L. neut. adj. nexile, tied or bound together, referring to its chain formation

Pronunciation, gender: NE-ksi-le, neuter

Type strain: ATCC 27757; DSM 1787; JCM 31500; VPI C48-37

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: X73443 Analyse FASTA

Effective publication: Holdeman LV, Moore WEC. New genus, Coprococcus, twelve new species, and emended descriptions of four previously described species of bacteria from human feces. International Journal of Systematic Bacteriology 1974; 24:260-277.

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: synonym (and not recommended for medical use)

Correct name: Faecalimonas nexilis (Holdeman and Moore 1974) Yamamoto et al. 2026

Risk group: 1

Synonyms:

Name	Kind
Faecalimonas nexilis (Holdeman and Moore 1974) Yamamoto et al. 2026	homotypic synonym, validly published under the ICNP
"Tyzzerella nexilis" (Holdeman and Moore 1974) Yutin and Galperin 2013	homotypic synonym, not validly published

Notes:
- ❗ Clostridium nexile is the correct name instead if this species is regarded as a separate species (i.e., if its nomenclatural type is not assigned to another species whose name is validly published, legitimate and not rejected and has priority) within a separate genus Clostridium.
- 😷 The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 1, note = "Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No". — The risk group for Swiss Confederation has been imported on 2024-02-01. The full classification is: risk group = 1. — The risk group for Germany has been imported on 2023-10-29. The full classification is: risk group = 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.
- 🎓 Name mentioned 18 times in PubMed until 2025-06-04.
- 🙅 This name is on the List of Recommended Names for bacteria of medical importance (LoRN) as a synonym of the name to be applied to this species. The name is on LoRN because of the recorded risk group of the genus.
- 🧍 According to Ludwig et al. (2021), this "species may be reclassified with the Lachnospiraceae as a new genus together with Coprococcus comes". Publication: Ludwig W, Viver T, Westram R, Francisco Gago J, Bustos-Caparros E, Knittel K, Amann R, Rossello-Mora R. Release LTP_12_2020, featuring a new ARB alignment and improved 16S rRNA tree for prokaryotic type strains. Syst Appl Microbiol 2021; 44:126218. 🇪🇸

Parent taxon: Clostridium Prazmowski 1880 (Approved Lists 1980)

Assigned by: Holdeman LV, Moore WEC. New genus, Coprococcus, twelve new species, and emended descriptions of four previously described species of bacteria from human feces. International Journal of Systematic Bacteriology 1974; 24:260-277.

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Record number: 774934

This LPSN page was printed on 2026-01-16 12:34:48

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Species Clostridium nexile