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

Gender: 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

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.
  • 🎓 Name mentioned 2 times in PubMed until 2024-03-27.
  • 🧍 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