Name: Spiroplasma mirum Tully et al. 1982

Category: Species

Proposed as: sp. nov.

Etymology: mi’rum. L. neut. adj. mirum, astonishing, extraordinary

Pronunciation, gender: MI-rum, neuter

Type strain: ATCC 29335; CIP 103925; DSM 22553; SMCA

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: M24662 Analyse FASTA

Valid publication: Tully JG, Whitcomb RF, Rose DL, Bové JM. Spiroplasma mirum, a new species from the rabbit tick (Haemaphysalis leporipalustris). Int. J. Syst. Bacteriol. 1982; 32:92-100.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name (and explicitly recommended for medical use)

Risk group: 2

• Synonyms:

  • Name	Kind
    Spiroplasma atrichopogonis Koerber et al. 2005	heterotypic synonym, validly published under the ICNP

• Notes:
  • ⏰ According to Bhargava et al. (2024), this species is an earlier heterotypic synonym of Spiroplasma atrichopogonis Koerber et al. 2005. Publication: Bhargava V, Lahon D, Gupta S, Kaur J, Lata P. Genome-based reclassification of Spiroplasma atrichopogonis Koerber et al. 2005 as a later heterotypic synonym of Spiroplasma mirum Tully et al. 1982. International Journal of Systematic and Evolutionary Microbiology 2024; 74:0.
  • 🏢 Synonymy of this taxon was mentioned in an IJSEM list. Publication: Oren A, Göker M. Notification list. Notification that new names and new combinations have appeared in volume 74, part 11 of the IJSEM. Int J Syst Evol Microbiol 2025; 75:6619.
  • 😷 The risk group for Belgium has been imported on 2024-02-05. The full classification is: risk group = 1, note = "animal pathogen - biological class of risk animal: 2". — The risk group for Swiss Confederation has been imported on 2024-02-01. The full classification is: risk group = 2, note = "PV". — The risk group for Germany has been imported on 2023-10-29. The full classification is: risk group = 2, note = "t". — 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 34 times in PubMed until 2025-06-04.
  • 🙆 This name is on the List of Recommended Names for bacteria of medical importance (LoRN) as 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: Spiroplasma Saglio et al. 1973 (Approved Lists 1980)

Assigned by: Tully JG, Whitcomb RF, Rose DL, Bové JM. Spiroplasma mirum, a new species from the rabbit tick (Haemaphysalis leporipalustris). Int. J. Syst. Bacteriol. 1982; 32:92-100.

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Record number: 784948