Name: Azotobacter nigricans subsp. nigricans (Krassilnikov 1949) Thompson and Skerman 1981

Category: Subspecies

Proposed as: subsp. nov. (rule 40d)

Basonym: Azotobacter nigricans Krassilnikov 1949 (Approved Lists 1980)

Etymology: ni’gri.cans. L. masc. part. adj. nigricans, blackish

Gender: masculine

Type strain: ACM 1967; ATCC 35009; DSM 2288; LMG 2816; UQM 1967

See detailed strain information at

Effective publication: Thompson JP, Skerman VBD. Azotobacteraceae: the taxonomy and ecology of the aerobic nitrogen-fixing bacteria. Academic Press, London, 1980.

IJSEM list: Anonymous. Validation list no. 6. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1981; 31:215-218.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

Risk group: 1

• Notes:
  • 📠 This subspecies was automatically created by the valid publication of Azotobacter nigricans subsp. achromogenes Thompson and Skerman 1981 according to rule 40d. Publication: Thompson JP, Skerman VBD. Azotobacteraceae: the taxonomy and ecology of the aerobic nitrogen-fixing bacteria. Academic Press, London, 1980.
  • 😷 The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 1, note = "Animal classification RG: 1 - Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No - Containment level: Containment Level 1". — 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. — 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.
  • 🧍 The original authorship, Krasil'nikov 1949, was corrected according to the new Rule 40d. Publication: Garrity GM, Labeda DP, Oren A. Judicial Commission of the International Committee on Systematics of Prokaryotes. XIIth International (IUMS) Congress of Bacteriology and Applied Microbiology. Minutes of the meetings, 3, 4 and 6 August 2008, Istanbul, Turkey. Int. J. Syst. Evol. Microbiol. 2011; 61:2775-2780.

Parent taxon: Azotobacter nigricans Krassilnikov 1949 (Approved Lists 1980)

Assigned by: Thompson JP, Skerman VBD. Azotobacteraceae: the taxonomy and ecology of the aerobic nitrogen-fixing bacteria. Academic Press, London, 1980.

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Record number: 773608