Name: Coprococcus immobilis Huang et al. 2025

Category: Species

Proposed as: sp. nov.

Etymology: im.mo’bi.lis. L. masc. adj. immobilis, nonmotile, indicating the non-motility of the type strain

Pronunciation (Latin), gender: ko-pro-KOK-kus im-MO-bi-lis, masculine

Type strain: CGMCC 1.48217; HA0444; JCM 37951; KCTC 25745

Conduct genome-based taxonomy at

16S rRNA gene: LC886103 Analyse FASTA

Effective publication: Huang HJ, Liu C, Sun XW, Wei RQ, Liu LW, Chen HY, Abdugheni R, Wang CY, Wang XM, Jiang H, et al. The rheumatoid arthritis gut microbial biobank reveals core microbial species that associate and effect on host inflammation and autoimmune responses. Imeta 2024; 3:e242. 🇨🇳

IJSEM list: Oren A, Göker M. Validation list no. 223. List of new names and new combinations previously effectively, but not validly, published. Int J Syst Evol Microbiol 2025; 75:6699.

Nomenclatural status: validly published under the ICNP

Taxonomic status: synonym (and not recommended for medical use)

Correct name: Pseudocoprococcus immobilis (Huang et al. 2025) Yamamoto et al. 2026

• Synonyms:

  • Name	Kind
    Pseudocoprococcus immobilis (Huang et al. 2025) Yamamoto et al. 2026	homotypic synonym, validly published under the ICNP

• Notes:
  • ❗ Coprococcus immobilis 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 Coprococcus.
  • 🎓 Name mentioned 1 time in PubMed until 2026-06-04.
  • 🙅 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.
  • 🧍 The distinct name Coprococcus mobilis from the same publication has a similar spelling. Publication: Angell RC, Freund GE, Willett P. Automatic spelling correction using a trigram similarity measure. Information Processing and Management 1983; 19:255-261.

Parent taxon: Coprococcus Holdeman and Moore 1974 (Approved Lists 1980)

Assigned by: Huang HJ, Liu C, Sun XW, Wei RQ, Liu LW, Chen HY, Abdugheni R, Wang CY, Wang XM, Jiang H, et al. The rheumatoid arthritis gut microbial biobank reveals core microbial species that associate and effect on host inflammation and autoimmune responses. Imeta 2024; 3:e242. 🇨🇳

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Record number: 65772