Name: Azotobacter macrocytogenes Jensen 1955 (Approved Lists 1980)

Category: Species

Proposed as: sp. nov.

Etymology: ma.cro.cy.to’ge.nes. Gr. masc. adj. makros, length, large; Gr. neut. n. kytos, hollow, vessel, jar and, in biology, a cell; Gr. suff. -genes, producing; from Gr. ind. v. gennaô, to produce; N.L. masc. part. adj. macrocytogenes, large cell producing

Pronunciation (Latin), gender: … ma-kro-ky-TO-ge-nes, masculine

Type strain: ATCC 12335; CIP 103928; DSM 721; LMG 1266; NCAIM B.01790; NCIB 8700; NCIMB 8700; O of Jensen; WR 111

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: EF100146 Analyse FASTA

Effective publication: Jensen HL. Azotobacter macrocytogenes n. sp., a nitrogen-fixing bacterium resistant to acid reaction. Acta Agriculturae Scandinavica 1955; 5:280-294.

IJSEM list: Skerman VBD, McGowan V, Sneath PHA. Approved lists of bacterial names. Int J Syst Bacteriol 1980; 30:225-420.

Nomenclatural status: validly published under the ICNP

Taxonomic status: synonym

Correct name: Azomonas macrocytogenes (Jensen 1955) New and Tchan 1982

Risk group: 1

• Synonyms:

  • Name	Kind
    Azomonas macrocytogenes (Jensen 1955) New and Tchan 1982	homotypic synonym, validly published under the ICNP
    Azomonotrichon macrocytogenes (Jensen 1955) Thompson and Skerman 1981	homotypic synonym, validly published under the ICNP

• Notes:
  • ❗ Azotobacter macrocytogenes 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 Azotobacter.
  • 😷 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.
  • 🎓 Name mentioned 1 time in PubMed until 2025-06-04.

Parent taxon: Azotobacter Beijerinck 1901 (Approved Lists 1980)

Assigned by: Jensen HL. Azotobacter macrocytogenes n. sp., a nitrogen-fixing bacterium resistant to acid reaction. Acta Agriculturae Scandinavica 1955; 5:280-294.

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Record number: 773605