Species ***Streptomyces* *hygroscopicus***

Classification:

Bacteria Bacillati Actinomycetota Actinomycetes Kitasatosporales Streptomycetaceae Streptomyces Streptomyces hygroscopicus

Name: Streptomyces hygroscopicus (Jensen 1931) Yüntsen et al. 1956 (Approved Lists 1980)

Category, proposed as: species, comb. nov.

Basonym: "Actinomyces hygroscopicus" Jensen 1931

Etymology: hy.gro.sco’pi.cus. Gr. masc. adj. hygros, moist; Gr. masc./fem. n. skopos, one that watches, watcher; N.L. masc. adj. hygroscopicus, detecting moisture, covered with moisture, hygroscopic

Pronunciation (Latin), gender: strep-TO-my-kes hy-gro-SKO-pi-kus, masculine

Type strain: ATCC 27438; BCRC 11611; CBS 773.72; CCRC 11611; CECT 3136; CECT 3139; CIP 106840; DSM 40578; DSM 41148; IFO 13472; JCM 4772; LMG 19335; NBRC 13472; NRRL 2387; NRRL ISP-5578; RIA 1433; VKM Ac-831

Conduct genome-based taxonomy at

16S rRNA gene: AB184428 Analyse FASTA

Effective publication: Waksman SA, Henrici AT. Family III. Streptomycetaceae Waksman and Henrici. In: Breed RS, Murray EGD, Hitchens AP (eds), Bergey's Manual of Determinative Bacteriology, 6th ed., The Williams & Wilkins Co, Baltimore, 1948, p. 929-980.

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
"Actinomyces hygroscopicus" Jensen 1931	homotypic synonym, not validly published, basonym of name in Approved Lists
Streptomyces endus Anderson and Gottlieb 1952 (Approved Lists 1980)	heterotypic synonym, validly published under the ICNP

Emendations:
- Labeda and Lyons 1991 Labeda DP, Lyons AJ. The Streptomyces violaceusniger cluster is heterogeneous in DNA relatedness among strains: emendation of the descriptions of S. violaceusniger and Streptomyces hygroscopicus. Int. J. Syst. Bacteriol. 1991; 41:398-401. 🇺🇸
  Notes:
  - 🧍 This emendation was not found in the expected IJSEM notification list.
- Komaki et al. 2022 Komaki H, Igarashi Y, Tamura T. Taxonomic Positions of a Nyuzenamide-Producer and Its Closely Related Strains. Microorganisms 2022; 10:0. 🇯🇵 Oren A, Göker M. List of changes in taxonomic opinion no. 37. Notification of changes in taxonomic opinion previously published outside the IJSEM. Int J Syst Evol Microbiol 2023; 73:5696.
  Notes:
  - 🫂 Emendation accompanied by 3 proposals regarding the synonymy of the species.

Notes:
- ⏰ According to Komaki et al. (2017), this species is an earlier heterotypic synonym of Streptomyces endus Anderson and Gottlieb 1952 (Approved Lists 1980). Publication: Komaki H, Ichikawa N, Oguchi A, Hamada M, Tamura T, Fujita N, Suzuki KI. Genome analysis-based reclassification of Streptomyces endus and Streptomyces sporocinereus as later heterotypic synonyms of Streptomyces hygroscopicus subsp. hygroscopicus. Int J Syst Evol Microbiol 2017; 67:343-345. 🇯🇵
- ⏰ According to Komaki et al. (2017), this species is an earlier heterotypic synonym of Streptomyces sporocinereus (ex Krassilnikov 1970) Preobrazhenskaya 1986. Publication: Komaki H, Ichikawa N, Oguchi A, Hamada M, Tamura T, Fujita N, Suzuki KI. Genome analysis-based reclassification of Streptomyces endus and Streptomyces sporocinereus as later heterotypic synonyms of Streptomyces hygroscopicus subsp. hygroscopicus. Int J Syst Evol Microbiol 2017; 67:343-345. 🇯🇵
- ⏰ According to Komaki et al. (2022), this species is an earlier heterotypic synonym of Streptomyces endus Anderson and Gottlieb 1952 (Approved Lists 1980). Publication: Komaki H, Igarashi Y, Tamura T. Taxonomic Positions of a Nyuzenamide-Producer and Its Closely Related Strains. Microorganisms 2022; 10:0. 🇯🇵
- ⏰ According to Komaki et al. (2022), this species is not an earlier heterotypic synonym of Streptomyces demainii Goodfellow et al. 2008. Publication: Komaki H, Igarashi Y, Tamura T. Taxonomic Positions of a Nyuzenamide-Producer and Its Closely Related Strains. Microorganisms 2022; 10:0. 🇯🇵
- ⏰ According to Komaki et al. (2022), this species is not an earlier heterotypic synonym of Streptomyces sporocinereus (ex Krassilnikov 1970) Preobrazhenskaya 1986. Publication: Komaki H, Igarashi Y, Tamura T. Taxonomic Positions of a Nyuzenamide-Producer and Its Closely Related Strains. Microorganisms 2022; 10:0. 🇯🇵
- 🏢 Synonymy of this taxon was mentioned in an IJSEM list. Publication: Oren A, Garrity GM. Validation list no. 207. List of new names and new combinations previously effectively, but not validly, published. Int J Syst Evol Microbiol 2022; 72:5517.
- 🏢 Synonymy of this taxon was mentioned in an IJSEM list. Publication: Oren A, Göker M. List of changes in taxonomic opinion no. 40. Notification of changes in taxonomic opinion previously published outside the IJSEM. Int J Syst Evol Microbiol 2024; 74:6482.
- 😩 Deposits incorrectly indicated in some sources as representing the type strain of this taxon: ATCC 43692; DSM 41460; INMI 32; JCM 9093; NBRC 100766; NRRL B-16376; VKM Ac-312.
- 😷 The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 1, note = "Animal classification RG: 1 - Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No - Containment level: Containment Level 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 636 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.
- 🧍 The original authorship, (Jensen 1931) Waksman and Henrici, was corrected according to the new Rule 40d. Publication: Garrity GM, Labeda DP, Oren A. Judicial Commission of the International Committee on Systematics of Prokaryotes. XIIth International (IUMS) Congress of Bacteriology and Applied Microbiology. Minutes of the meetings, 3, 4 and 6 August 2008, Istanbul, Turkey. Int. J. Syst. Evol. Microbiol. 2011; 61:2775-2780. 🇺🇸

Subdivision:

Number of child taxa with a validly published and correct name: 2
Number of child taxa with a validly published name, including synonyms: 6
Total number of child taxa: 11

Child taxa:

Name	Nomenclatural status	Taxonomic status
"Streptomyces hygroscopicus subsp. aabomyceticus" Seino et al. 1970	not validly published	preferred name
Streptomyces hygroscopicus subsp. angustmyceticus Yüntsen et al. 1956 (Approved Lists 1980)	validly published under the ICNP	synonym
"Streptomyces hygroscopicus subsp. aureolacrimosus" Takiguchi et al. 1980	not validly published	preferred name
Streptomyces hygroscopicus subsp. decoyicus Vavra et al. 1959 (Approved Lists 1980)	validly published under the ICNP	synonym
"Streptomyces hygroscopicus subsp. duamyceticus" Shin et al. 2008	not validly published	preferred name
"Streptomyces hygroscopicus var. enhygrus" Johnson and Dietz 1971	not validly published	preferred name
Streptomyces hygroscopicus subsp. glebosus Ohmori et al. 1962 (Approved Lists 1980)	validly published under the ICNP	synonym
Streptomyces hygroscopicus subsp. hygroscopicus (Jensen 1931) Yüntsen et al. 1956 (Approved Lists 1980)	validly published under the ICNP	correct name
Streptomyces hygroscopicus subsp. ossamyceticus Schmitz et al. 1965 (Approved Lists 1980)	validly published under the ICNP	synonym
Streptomyces hygroscopicus subsp. sporocinereus (Preobrazhenskaya 1986 ex Krassilnikov 1970) Komaki et al. 2022	validly published under the ICNP	correct name
"Streptomyces hygroscopicus subsp. yakushimaensis" Hatanaka et al. 1988	not validly published	preferred name

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

Assigned by: Waksman SA, Henrici AT. Family III. Streptomycetaceae Waksman and Henrici. In: Breed RS, Murray EGD, Hitchens AP (eds), Bergey's Manual of Determinative Bacteriology, 6th ed., The Williams & Wilkins Co, Baltimore, 1948, p. 929-980.

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Record number: 781756

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