Name: Flectobacillus major (Gromov 1963) Larkin et al. 1977 (Approved Lists 1980)

Category: Species

Proposed as: comb. nov.

Basonym: "Microcyclus major" Gromov 1963

Etymology: ma’jor. L. comp. masc. adj. major, larger (comp. of magnus) [probably better: maior]

Pronunciation (Latin), gender: … MA-jor, masculine

Type strain: ATCC 29496; DSM 103; LMG 13163; VKM B-859

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: M62787 Analyse FASTA

Effective publication: Larkin JM, Williams PM, Taylor R. Taxonomy of the genus Microcyclus Ørskov 1928: Reintroduction and emendation of the genus Spirosoma Migula 1894 and proposal of a new genus, Flectobacillus. International Journal of Systematic Bacteriology 1977; 27:147-156.

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

• Synonyms:

  • Name	Kind
    "Microcyclus major" Gromov 1963	homotypic synonym, not validly published, basonym of name in Approved Lists

• Emendations:
  • Hahnke et al. 2016 Hahnke RL, Meier-Kolthoff JP, Garcia-Lopez M, Mukherjee S, Huntemann M, Ivanova NN, Woyke T, Kyrpides NC, Klenk HP, Goker M. Genome-Based Taxonomic Classification of Bacteroidetes. Front Microbiol 2016; 7:2003. 🇩🇪 Oren A, Garrity GM. List of changes in taxonomic opinion no. 26. Notification of changes in taxonomic opinion previously published outside the IJSEM. Int J Syst Evol Microbiol 2017; 67:2081-2086.
    Notes:
    • 🧍 The genome of the type strain was sequenced as part of the GEBA (Genomic Encyclopedia of Bacteria and Archaea) project.

• Notes:
  • 🥇 Nomenclatural type of the genus Flectobacillus Larkin et al. 1977 (Approved Lists 1980). Publication: Larkin JM, Williams PM, Taylor R. Taxonomy of the genus Microcyclus Ørskov 1928: Reintroduction and emendation of the genus Spirosoma Migula 1894 and proposal of a new genus, Flectobacillus. International Journal of Systematic Bacteriology 1977; 27:147-156.
  • 😷 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. — 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 13 times in PubMed until 2025-06-04.

Parent taxon: Flectobacillus Larkin et al. 1977 (Approved Lists 1980)

Assigned by: Larkin JM, Williams PM, Taylor R. Taxonomy of the genus Microcyclus Ørskov 1928: Reintroduction and emendation of the genus Spirosoma Migula 1894 and proposal of a new genus, Flectobacillus. International Journal of Systematic Bacteriology 1977; 27:147-156.

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Record number: 776283