Species ***Streptomyces* *nigrescens***

Name: Streptomyces nigrescens (Sveshnikova 1957) Pridham et al. 1958 (Approved Lists 1980)

Category: Species

Proposed as: comb. nov.

Basonym: "Actinomyces nigrescens" Sveshnikova 1957

Etymology: ni.gres’cens. L. masc. part. adj. nigrescens, becoming black

Pronunciation (Latin), gender: strep-TO-my-kes ni-GRES-kens, masculine

Type strain: ATCC 23941; CBS 925.68; CGMCC 4.1410; DSM 40276; IFO 12894; INA 1800/54; ISP 5276; JCM 4401; JCM 4410; LMG 19332; NBRC 12894; NCIB 9856; NCIMB 9856; NRRL B-12176; NRRL ISP-5276; RIA 1194; VKM Ac-1705

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AB184225 Analyse FASTA

Effective publication: Pridham TG, Hesseltine CW, Benedict RG. A guide for the classification of streptomycetes according to selected groups; placement of strains in morphological sections. Appl Microbiol 1958; 6:52-79.

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 (and explicitly recommended for medical use)

Risk group: 1

Synonyms:

Name	Kind
Streptomyces ruanii Kumar and Goodfellow 2008	homotypic synonym, validly published under the ICNP, illegitimate name
"Actinomyces nigrescens" Sveshnikova 1957	homotypic synonym, not validly published, basonym of name in Approved Lists
Streptomyces libani Baldacci and Grein 1966 (Approved Lists 1980)	heterotypic synonym, validly published under the ICNP

Emendations:
- Komaki and Tamura 2020 Komaki H, Tamura T. Reclassification of Streptomyces hygroscopicus subsp. glebosus and Streptomyces libani subsp. rufus as later heterotypic synonyms of Streptomyces platensis. Int J Syst Evol Microbiol 2020; 70:4398-4405. 🇯🇵 Oren A, Garrity GM. Notification list. Notification that new names and new combinations have appeared in volume 70, part 7 of the IJSEM. Int J Syst Evol Microbiol 2020; 70:5187-5189.

Notes:
- ⏰ According to Shu et al. (2025), this species is an earlier heterotypic synonym of Streptomyces libani Baldacci and Grein 1966 (Approved Lists 1980). Publication: Shu W, Ruckert-Reed C, Gromyko O, Tistechok S, Kalinowski J, Luzhetskyy A, Wittmann C. Description of Streptomyces explomaris sp. nov., isolated from the coastal soil rhizosphere of Juniperus excelsa and reclassification of Streptomyces libani as a later heterotypic synonym of Streptomyces nigrescens. Int J Syst Evol Microbiol 2025; 75:6711. 🇩🇪
- 🏢 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 75, part 5 of the IJSEM. Int J Syst Evol Microbiol 2025; 75:6824.
- 😷 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 2026-08-13. 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 18 times 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 genus.

Parent taxon: Streptomyces Waksman and Henrici 1943 (Approved Lists 1980)

Assigned by: Pridham TG, Hesseltine CW, Benedict RG. A guide for the classification of streptomycetes according to selected groups; placement of strains in morphological sections. Appl Microbiol 1958; 6:52-79.

Linking: To permanently link to this page, use https://doi.org/10.83108/rn.781879Link copied to clipboard

Record number: 781879

This LPSN page was printed on 2026-08-20 00:24:44

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Species Streptomyces nigrescens

Species ***Streptomyces* *nigrescens***