Name: "Candidatus Borkfalkia ceftriaxoniphila" Hildebrand et al. 2020

Category: Species

Proposed as: Candidatus

Etymology: cef.tri.a.xo.ni’phi.la. N.L. neut. n. ceftriaxonum, ceftriaxone; N.L. masc. adj. suff. -philus, loving; from Gr. masc. adj. philos, on; N.L. fem. adj. ceftriaxoniphila, loving ceftriaxone

Pronunciation (Latin), gender: bork-FAL-ki-a kef-tri-a-xo-NI-p^hi-la, feminine

Nomenclatural type: HDS1380

Conduct genome-based taxonomy at

Effective publication: Hildebrand F, Pallen MJ, Bork P. Towards standardisation of naming novel prokaryotic taxa in the age of high-throughput microbiology. Gut 2020; 69:1358-1359. 🇬🇧

IJSEM list: Oren A, Garrity GM. Candidatus list no. 3. Lists of names of prokaryotic Candidatus taxa. Int J Syst Evol Microbiol 2022; 72:5186.

Nomenclatural status: not validly published

Nomenclatural pro-status: pro-validly published under the ICNP

Taxonomic status: pro-correct name

• Synonyms:

  • Name	Kind
    "Candidatus Borkfalki ceftriaxensis" Hildebrand et al. 2019	homotypic synonym, not pro-validly published

• Notes:
  • 🥇 Nomenclatural type of the genus "Candidatus Borkfalkia" Hildebrand et al. 2020. Publication: Hildebrand F, Pallen MJ, Bork P. Towards standardisation of naming novel prokaryotic taxa in the age of high-throughput microbiology. Gut 2020; 69:1358-1359. 🇬🇧
  • 🧍 See also Leung et al. (2024). Publication: Leung HKM, Lo EKK, Chen C, Zhang F, Felicianna, Ismaiah MJ, El-Nezami H. Probiotic Mixture Attenuates Colorectal Tumorigenesis in Murine AOM/DSS Model by Suppressing STAT3, Inducing Apoptotic p53 and Modulating Gut Microbiota. Probiotics Antimicrob Proteins 2025; 17:2227-2243. 🇭🇰
  • 🧍 This species was confirmed as the type species of its monotypic genus in Appendix 1 of Candidatus List No. 6.

Parent taxon: "Candidatus Borkfalkia" Hildebrand et al. 2020

Assigned by: Hildebrand F, Pallen MJ, Bork P. Towards standardisation of naming novel prokaryotic taxa in the age of high-throughput microbiology. Gut 2020; 69:1358-1359. 🇬🇧

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Record number: 28688