Name: Aquaspirillum gracile (Canale-Parola et al. 1966) Hylemon et al. 1973 (Approved Lists 1980)

Category: Species

Proposed as: comb. nov.

Basonym: "Spirillum gracile" Canale-Parola et al. 1966

Etymology: gra’ci.le. L. neut. adj. gracile, thin, slight, slender

Pronunciation (Latin), gender: … GRA-ki-le, neuter

Type strain: ATCC 19624; DSM 9158; IFO 14920; LMG 8201; NBRC 14920; VKM B-1405

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AF078753 Analyse FASTA

Effective publication: Hylemon PB, Wells Jr. JS, Krieg NR, Jannasch HW. The genus Spirillum: A taxonomic study. International Journal of Systematic Bacteriology 1973; 23:340-380.

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: synonym (and not recommended for medical use)

Correct name: Hylemonella gracilis (Canale-Parola et al. 1966) Spring et al. 2004

Risk group: 1

• Synonyms:

  • Name	Kind
    Hylemonella gracilis (Canale-Parola et al. 1966) Spring et al. 2004	homotypic synonym, validly published under the ICNP
    "Spirillum gracile" Canale-Parola et al. 1966	homotypic synonym, not validly published, basonym of name in Approved Lists

• Notes:
  • ❗ Aquaspirillum gracile 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 Aquaspirillum.
  • 😷 The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 1, note = "Spirillum gracile: 1 Animal classification RG: 1 - Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No - Containment level: Containment Level 1". — 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 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 2 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 risk group of the genus.
  • 🧍 Cited erroneously as synonym of Aquaspirillum serpens until April 1994 in DSMZ List. — Leibniz Institute DSMZ. Prokaryotic Nomenclature Up-to-date, 2018-12-11.

Parent taxon: Aquaspirillum Hylemon et al. 1973 (Approved Lists 1980)

Assigned by: Hylemon PB, Wells Jr. JS, Krieg NR, Jannasch HW. The genus Spirillum: A taxonomic study. International Journal of Systematic Bacteriology 1973; 23:340-380.

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Record number: 773328