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

Category: Species

Proposed as: comb. nov.

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

Etymology: ne’xi.lis. L. fem. adj. nexilis, tied or bound together, referring to its chain formation

Pronunciation (Latin), gender: … NE-ksi-lis, feminine

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

Valid publication: Yamamoto E, Hisatomi A, Miwa K, Sakurai N, Koizumi A, Ohkuma M, Tsuchihashi H, Sakamoto M. Proposal of two novel species, Allocoprococcus similis gen. nov., sp. nov. and Faecalimonas hominis sp. nov., isolated from human faeces and genome-based reorganization of the genus Coprococcus. Int J Syst Evol Microbiol 2026; 76:7011. 🇯🇵

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name (and explicitly recommended for medical use)

• Synonyms:

  • Name	Kind
    "Tyzzerella nexilis" (Holdeman and Moore 1974) Yutin and Galperin 2013	homotypic synonym, not validly published
    Clostridium nexile Holdeman and Moore 1974 (Approved Lists 1980)	homotypic synonym, validly published under the ICNP

• Notes:
  • 🧬 The phylogenomic assignment score of this taxon is 0.00980 (N = 61).
  • 🎓 Name mentioned 0 times in PubMed until 2026-01-09.
  • 🙆 This name is on the List of Recommended Names for bacteria of medical importance (LoRN) as the name to be applied to this species. The name is on LoRN because of the recorded risk group of the genus.

Parent taxon: Faecalimonas Sakamoto et al. 2017

Assigned by: Yamamoto E, Hisatomi A, Miwa K, Sakurai N, Koizumi A, Ohkuma M, Tsuchihashi H, Sakamoto M. Proposal of two novel species, Allocoprococcus similis gen. nov., sp. nov. and Faecalimonas hominis sp. nov., isolated from human faeces and genome-based reorganization of the genus Coprococcus. Int J Syst Evol Microbiol 2026; 76:7011. 🇯🇵

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Record number: 69698