Species Faecalicoccus pleomorphus

Name: Faecalicoccus pleomorphus (Barnes et al. 1979) De Maesschalck et al. 2014

Category, proposed as: species, comb. nov.

Basonym: Streptococcus pleomorphus Barnes et al. 1979 (Approved Lists 1980)

Etymology: ple.o.mor’phus. N.L. masc. adj. pleomorphus, pleomorphic; from Gr. masc. adj. pleôs, full; from Gr. fem. n. morphê, form, shape

Pronunciation (Latin), gender: fa͡e-ka-li-KOK-kus ple-o-MOR-p^hus, masculine

Type strain: ATCC 29734; CCUG 11733; DSM 20574; EBF 61/60B; JCM 10414; NCTC 11087

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: M23730 Analyse FASTA

Valid publication: De Maesschalck C, Van Immerseel F, Eeckhaut V, De Baere S, Cnockaert M, Croubels S, Haesebrouck F, Ducatelle R, Vandamme P. Faecalicoccus acidiformans gen. nov., sp. nov., isolated from the chicken caecum, and reclassification of Streptococcus pleomorphus (Barnes et al. 1977), Eubacterium biforme (Eggerth 1935) and Eubacterium cylindroides (Cato et al. 1974) as Faecalicoccus pleomorphus comb. nov., Holdemanella biformis gen. nov., comb. nov. and Faecalitalea cylindroides gen. nov., comb. nov., respectively, within the family Erysipelotrichaceae. Int J Syst Evol Microbiol 2014; 64:3877-3884. 🇧🇪

IJSEM list: Oren A, Garrity GM. Notification list. Notification that new names and new combinations have appeared in volume 64, part 11 of the IJSEM. Int J Syst Evol Microbiol 2015; 65:323-324.

Nomenclatural status: validly published under the ICNP

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

Risk group: 1

• Synonyms:

  • Name	Kind
    Streptococcus pleomorphus Barnes et al. 1979 (Approved Lists 1980)	homotypic synonym, validly published under the ICNP

• Notes:
  • 🧬 The phylogenomic assignment score of this taxon is 0.06285 (N = 24).
  • 😷 The risk group for Germany has been imported on 2026-08-13. 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 4 times in PubMed until 2026-06-11.
  • 🫡 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. This name is not taxonomically suspended any more in favour of Streptococcus pleomorphus Barnes et al. 1979 (Approved Lists 1980). Publication: Barnes EM, Impey CS, Stevens BJ, Peel JL. Streptococcus pleomorphus sp.nov.: an anaerobic streptococcus isolated mainly from the caeca of birds. J Gen Microbiol 1977; 102:45-53. Skerman VBD, McGowan V, Sneath PHA. Approved lists of bacterial names. Int J Syst Bacteriol 1980; 30:225-420.
  • 🧍 The genome of the type strain was sequenced as part of the GEBA (Genomic Encyclopedia of Bacteria and Archaea) project. Publication: Mukherjee S, Seshadri R, Varghese NJ, Eloe-Fadrosh EA, Meier-Kolthoff JP, Goker M, Coates RC, Hadjithomas M, Pavlopoulos GA, Paez-Espino D, et al. 1,003 reference genomes of bacterial and archaeal isolates expand coverage of the tree of life. Nat Biotechnol 2017; 35:676-683. 🇺🇸

Parent taxon: Faecalicoccus De Maesschalck et al. 2014

Assigned by: De Maesschalck C, Van Immerseel F, Eeckhaut V, De Baere S, Cnockaert M, Croubels S, Haesebrouck F, Ducatelle R, Vandamme P. Faecalicoccus acidiformans gen. nov., sp. nov., isolated from the chicken caecum, and reclassification of Streptococcus pleomorphus (Barnes et al. 1977), Eubacterium biforme (Eggerth 1935) and Eubacterium cylindroides (Cato et al. 1974) as Faecalicoccus pleomorphus comb. nov., Holdemanella biformis gen. nov., comb. nov. and Faecalitalea cylindroides gen. nov., comb. nov., respectively, within the family Erysipelotrichaceae. Int J Syst Evol Microbiol 2014; 64:3877-3884. 🇧🇪

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Record number: 792303