Name: Williamsia marianensis Pathom-aree et al. 2006

Category: Species

Proposed as: sp. nov.

Etymology: ma.ri.a.nen’sis. N.L. fem. adj. marianensis, of or pertaining to the Mariana Trench, the source of the type strain

Pronunciation, gender: ma-ri-a-NEN-sis, feminine

Type strain: DSM 44944; JCM 14345; MT8; NCIMB 14085

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: KF410357 Analyse FASTA

Valid publication: Pathom-Aree W, Nogi Y, Sutcliffe IC, Ward AC, Horikoshi K, Bull AT, Goodfellow M. Williamsia marianensis sp. nov., a novel actinomycete isolated from the Mariana Trench. Int J Syst Evol Microbiol 2006; 56:1123-1126. 🇬🇧

IJSEM list: Euzeby JP. Notification list. Notification that new names and new combinations have appeared in volume 56, part 5 of the IJSEM. Int J Syst Evol Microbiol 2006; 56:1719-1720.

Nomenclatural status: validly published under the ICNP

Taxonomic status: synonym (and not recommended for medical use)

Correct name: Williamsia muralis Kämpfer et al. 1999

Risk group: 1

• Synonyms:

  • Name	Kind
    Williamsia muralis Kämpfer et al. 1999	heterotypic synonym, validly published under the ICNP

• Notes:
  • ⏲ According to Kumar et al. (2024), this species is a later heterotypic synonym of Williamsia muralis Kämpfer et al. 1999. Publication: Kumar A, Sood U, Garg G, Lal R, Rawat CD. Genome-based reclassification of Williamsia marianensis as a later heterotypic synonym of Williamsia muralis. Int J Syst Evol Microbiol 2024; 74:6485. 🇮🇳
  • 🏢 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 8 of the IJSEM. Int J Syst Evol Microbiol 2024; 74:6534.
  • ❗ Williamsia marianensis 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 Williamsia.
  • 😷 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 3 times in PubMed until 2025-06-04.
  • 🙅 This name is on the List of Recommended Names for bacteria of medical importance (LoRN) as a synonym of the name to be applied to this species. The name is on LoRN because of the recorded pathogenicity of other species in the genus.

Parent taxon: Williamsia Kämpfer et al. 1999

Assigned by: Pathom-Aree W, Nogi Y, Sutcliffe IC, Ward AC, Horikoshi K, Bull AT, Goodfellow M. Williamsia marianensis sp. nov., a novel actinomycete isolated from the Mariana Trench. Int J Syst Evol Microbiol 2006; 56:1123-1126. 🇬🇧

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Record number: 783104