Name: Ilyobacter delafieldii Janssen and Harfoot 1991

Category: Species

Proposed as: sp. nov.

Etymology: de.la.field’i.i. N.L. gen. masc. n. delafieldii, of Delafield, named after F.P. Delafield

Gender: masculine

Type strain: 10cr1; ATCC 49679; DSM 5704; LMG 16218

See detailed strain information at

16S rRNA gene: FR733681 Analyse FASTA

Effective publication: Janssen PH, Harfoot CG. Ilyobacter delafieldii sp. nov., a metabolically restricted anaerobic bacterium fermenting PHB. Arch. Microbiol. 1990; 154:253-259.

IJSEM list: Anonymous. Validation list no. 37. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1991; 41:331.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

Risk group: 1

• Notes:
  • 😷 The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 1, note = "Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No". — The risk group for Swiss Confederation has been imported on 2024-02-01. The full classification is: risk group = 1. — The risk group for Germany has been imported on 2023-10-29. The full classification is: risk group = 1.
  • 🎓 Name mentioned 3 times in PubMed until 2024-03-27.
  • 🧍 According to Ludwig et al. (2021), this "species affiliates away from the type species, and instead with one of the branches of the Clostridiaceae". Publication: Ludwig W, Viver T, Westram R, Francisco Gago J, Bustos-Caparros E, Knittel K, Amann R, Rossello-Mora R. Release LTP_12_2020, featuring a new ARB alignment and improved 16S rRNA tree for prokaryotic type strains. Syst Appl Microbiol 2021; 44:126218.
  • 🧍 Yarza et al. (2013) expected for accession FR733681, originating from the alleged type-strain deposit DSM 5704, an affiliation with Fusobacteriaceae (Fusobacteria) but observed an affiliation with Clostridiaceae (Firmicutes) and 98.8% similarity against Clostridium homopropionicum. Publication: Yarza P, Sproer C, Swiderski J, Mrotzek N, Spring S, Tindall BJ, Gronow S, Pukall R, Klenk HP, Lang E, et al. Sequencing orphan species initiative (SOS): Filling the gaps in the 16S rRNA gene sequence database for all species with validly published names. Syst Appl Microbiol 2013; 36:69-73.
  • 🧍 The 16S rRNA gene sequence of the type strain shows an unexpected affiliation with the family Clostridiaceae (98.8% similarity against Clostridium homopropionicum). Publication: Yarza P, Sproer C, Swiderski J, Mrotzek N, Spring S, Tindall BJ, Gronow S, Pukall R, Klenk HP, Lang E, et al. Sequencing orphan species initiative (SOS): Filling the gaps in the 16S rRNA gene sequence database for all species with validly published names. Syst Appl Microbiol 2013; 36:69-73.

Parent taxon: Ilyobacter Stieb and Schink 1985

Assigned by: Janssen PH, Harfoot CG. Ilyobacter delafieldii sp. nov., a metabolically restricted anaerobic bacterium fermenting PHB. Arch. Microbiol. 1990; 154:253-259.

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Record number: 777023