Species Metamycoplasma alkalescens

Name: Metamycoplasma alkalescens (Leach 1973) Gupta et al. 2018

Category, proposed as: species, comb. nov.

Basonym: Mycoplasma alkalescens Leach 1973 (Approved Lists 1980)

Etymology: al.ka.les’cens. N.L. v. alkalesco, to make alkaline, referring to the reaction produced in arginine-containing media; N.L. neut. part. adj. alkalescens, alkaline-making

Pronunciation (Latin), gender: me-ta-my-ko-PLAS-ma al-ka-LES-kens, neuter

Type strain: ATCC 29103; NCTC 10135; PG51

Conduct genome-based taxonomy at

16S rRNA gene: U44764 Analyse FASTA

Effective publication: Gupta RS, Sawnani S, Adeolu M, Alnajar S, Oren A. Phylogenetic framework for the phylum Tenericutes based on genome sequence data: proposal for the creation of a new order Mycoplasmoidales ord. nov., containing two new families Mycoplasmoidaceae fam. nov. and Metamycoplasmataceae fam. nov. harbouring Eperythrozoon, Ureaplasma and five novel genera. Antonie Van Leeuwenhoek 2018; 111:1583-1630. 🇨🇦

IJSEM list: Oren A, Garrity GM. Validation list no. 184. List of new names and new combinations previously effectively, but not validly, published. Int J Syst Evol Microbiol 2018; 68:3379-3393.

Nomenclatural status: validly published under the ICNP

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

Risk group: 2

• Synonyms:

  • Name	Kind
    Mycoplasma alkalescens Leach 1973 (Approved Lists 1980)	homotypic synonym, validly published under the ICNP

• Notes:
  • 😷 The risk group for Germany has been imported on 2026-08-13. 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 1 time in PubMed until 2026-06-11.
  • 🫡 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. This name is not taxonomically suspended any more in favour of Mycoplasma alkalescens Leach 1973 (Approved Lists 1980). Publication: Leach RH. Further studies on classification of bovine strains of mycoplasmatales, with proposals for new species, Acholeplasma modicum and Mycoplasma alkalescens. J Gen Microbiol 1973; 75:135-153. Skerman VBD, McGowan V, Sneath PHA. Approved lists of bacterial names. Int J Syst Bacteriol 1980; 30:225-420.

Parent taxon: Metamycoplasma Gupta et al. 2018

Assigned by: Gupta RS, Sawnani S, Adeolu M, Alnajar S, Oren A. Phylogenetic framework for the phylum Tenericutes based on genome sequence data: proposal for the creation of a new order Mycoplasmoidales ord. nov., containing two new families Mycoplasmoidaceae fam. nov. and Metamycoplasmataceae fam. nov. harbouring Eperythrozoon, Ureaplasma and five novel genera. Antonie Van Leeuwenhoek 2018; 111:1583-1630. 🇨🇦

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Record number: 798554