Name: Peptoniphilus faecalis Ryu et al. 2021

Category: Species

Proposed as: sp. nov.

Etymology: fae.ca’lis. N.L. masc. adj. faecalis, derived from faeces

Pronunciation (Latin), gender: pep-to-NI-p^hi-lus fa͡e-KA-lis, masculine

Type strain: AGMB00490; KCTC 15944; NBRC 114159

Conduct genome-based taxonomy at

16S rRNA gene: MT396160 Analyse FASTA

Valid publication: Ryu SW, Kim JS, Oh BS, Yu SY, Lee JS, Park SH, Kang SW, Lee J, Lee MK, Rhee MS, et al. Peptoniphilus faecalis sp. nov., isolated from swine faeces. Int J Syst Evol Microbiol 2021; 71:4836. 🇰🇷

IJSEM list: Oren A, Garrity GM. Notification list. Notification that new names and new combinations have appeared in volume 71, part 6 of the IJSEM. Int J Syst Evol Microbiol 2021; 71:4956.

Nomenclatural status: validly published under the ICNP

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

Risk group: 1

• Synonyms:

  • Name	Kind
    Peptoniphilus porci Wylensek et al. 2021	heterotypic synonym, validly published under the ICNP

• Notes:
  • ⏰ According to Malhotra et al. (2024), this species is an earlier heterotypic synonym of Peptoniphilus porci Wylensek et al. 2021. Publication: Malhotra M, Bello S, Gupta RS. Phylogenomic and molecular markers based studies on clarifying the evolutionary relationships among Peptoniphilus species. Identification of several Genus-Level clades of Peptoniphilus species and transfer of some Peptoniphilus species to the genus Aedoeadaptatus. Syst Appl Microbiol 2024; 47:126499. 🇨🇦
  • 🏢 Synonymy of this taxon was mentioned in an IJSEM list. Publication: Oren A, Göker M. List of changes in taxonomic opinion no. 40. Notification of changes in taxonomic opinion previously published outside the IJSEM. Int J Syst Evol Microbiol 2024; 74:6482.
  • 🏢 Synonymy of this taxon was mentioned in an IJSEM list. Publication: Oren A, Göker M. List of changes in taxonomic opinion no. 41. Notification of changes in taxonomic opinion previously published outside the IJSEM. Int J Syst Evol Microbiol 2025; 75:6561.
  • 😷 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 1 time 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.

Parent taxon: Peptoniphilus Ezaki et al. 2001

Assigned by: Ryu SW, Kim JS, Oh BS, Yu SY, Lee JS, Park SH, Kang SW, Lee J, Lee MK, Rhee MS, et al. Peptoniphilus faecalis sp. nov., isolated from swine faeces. Int J Syst Evol Microbiol 2021; 71:4836. 🇰🇷

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Record number: 8973