Name: Alcaligenes defragrans Foss et al. 1998

Category: Species

Proposed as: sp. nov.

Etymology: de.fra’grans. L. prep. de, away; L. pres. part. fragrans, emitting a smell, sweet-smelling, fragrant; L. masc. part. adj. defragrans, annihilating fragrance, referring to the capicity to degrade monoterpenes

Pronunciation (Latin), gender: … de-FRA-grans, masculine

Type strain: 54Pin; CCUG 39790; CIP 105602; DSM 12141; LMG 18538

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AJ005447 Analyse FASTA

Effective publication: Foss S, Heyen U, Harder J. Alcaligenes defragrans sp. nov., description of four strains isolated on alkenoic monoterpenes ((+)-menthene, alpha-pinene, 2-carene, and alpha-phellandrene) and nitrate. Syst Appl Microbiol 1998; 21:237-244. 🇩🇪

IJSEM list: Anonymous. Validation list no. 67. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1998; 48:1083-1084.

Nomenclatural status: validly published under the ICNP

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

Correct name: Castellaniella defragrans (Foss et al. 1998) Kämpfer et al. 2006

Risk group: 2

• Synonyms:

  • Name	Kind
    Castellaniella defragrans (Foss et al. 1998) Kämpfer et al. 2006	homotypic synonym, validly published under the ICNP

• Notes:
  • ❗ Alcaligenes defragrans 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 Alcaligenes.
  • 😷 The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 2, note = "Animal classification RG: 1 - Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No - Containment level: Containment Level 2". — The risk group for Swiss Confederation has been imported on 2024-02-01. The full classification is: risk group = 2. — The risk group for Germany has been imported on 2023-10-29. 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 11 times in PubMed until 2025-06-04.
  • 🙅 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 species itself.

Parent taxon: Alcaligenes Castellani and Chalmers 1919 (Approved Lists 1980)

Assigned by: Foss S, Heyen U, Harder J. Alcaligenes defragrans sp. nov., description of four strains isolated on alkenoic monoterpenes ((+)-menthene, alpha-pinene, 2-carene, and alpha-phellandrene) and nitrate. Syst Appl Microbiol 1998; 21:237-244. 🇩🇪

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Record number: 773006