Name: Beijerinckia derxii Tchan 1957 (Approved Lists 1980)

Category: Species

Proposed as: sp. nov.

Etymology: derx’i.i. N.L. gen. masc. n. derxii, of Derx, named after H.G. Derx, the Dutch microbiologist (1894-1953)

Gender: feminine

Type strain: ACM 1968; ATCC 49361; DSM 2328; LMG 3899; Q13 of Tchan; UQM 1968

See detailed strain information at

16S rRNA gene: AJ563933 Analyse FASTA

Effective publication: Tchan YT. Studies of nitrogen-fixing bacteria. VI. A new species of nitrogen-fixing bacteria. Proceedings of the Linnean Society New South Wales 1957; 82:314-316.

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: 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. — 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 4 times in PubMed until 2025-06-04.

Subdivision:

Number of child taxa with a validly published and correct name: 2
Number of child taxa with a validly published name, including synonyms: 2
Total number of child taxa: 2

• Child taxa:

  • Name	Nomenclatural status	Taxonomic status
    Beijerinckia derxii subsp. derxii (Tchan 1957) Thompson and Skerman 1981	validly published under the ICNP	correct name
    Beijerinckia derxii subsp. venezuelae Thompson and Skerman 1981	validly published under the ICNP	correct name

Parent taxon: Beijerinckia Derx 1950 (Approved Lists 1980)

Assigned by: Tchan YT. Studies of nitrogen-fixing bacteria. VI. A new species of nitrogen-fixing bacteria. Proceedings of the Linnean Society New South Wales 1957; 82:314-316.

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Record number: 783497