Name: Aquaspirillum polymorphum (Williams and Rittenberg 1957) Hylemon et al. 1973 (Approved Lists 1980)

Category: Species

Proposed as: comb. nov.

Basonym: "Spirillum polymorphum" Williams and Rittenberg 1957

Etymology: po.ly.mor’phum. N.L. neut. adj. polymorphum, having many shapes, polymorphous; from Gr. masc. adj. polymorphos

Gender: neuter

Type strain: ATCC 11332; CCUG 49450; CIP 63.15; DSM 9160; IFO 13961; JCM 21224; LMG 4392; NBRC 13961

See detailed strain information at

16S rRNA gene: FJ562215 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: correct name

Risk group: 1

• Synonyms:

  • Name	Kind
    "Spirillum polymorphum" Williams and Rittenberg 1957	homotypic synonym, not validly published, basonym of name in Approved Lists

• Notes:
  • 😷 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". — 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 0 times in PubMed until 2024-03-27.
  • 🧍 According to Ludwig et al. (2021), this "species affiliates with the Rhodospirillaceae and may be reclassified as Magnetospirillum". Publication: Ludwig W, Viver T, Westram R, Francisco Gago J, Bustos-Caparros E, Knittel K, Amann R, Rossello-Mora R. Release LTP_12_2020, featuring a new ARB alignment and improved 16S rRNA tree for prokaryotic type strains. Syst Appl Microbiol 2021; 44:126218.
  • 🧍 Yarza et al. (2013) expected for accession AB680539, originating from the alleged type-strain deposit NBRC 13961, an affiliation with Neisseriaceae (Betaproteobacteria) but observed an affiliation with a deep branch in Alphaproteobacteria and 98% similarity against Magnetospirillum gryphiswaldense. Publication: Yarza P, Sproer C, Swiderski J, Mrotzek N, Spring S, Tindall BJ, Gronow S, Pukall R, Klenk HP, Lang E, et al. Sequencing orphan species initiative (SOS): Filling the gaps in the 16S rRNA gene sequence database for all species with validly published names. Syst Appl Microbiol 2013; 36:69-73.
  • 🧍 The 16S rRNA gene sequence of the type strain shows an unexpected affiliation with a deep branch in Alphaproteobacteria (98% similarity against Magnetospirillum gryphiswaldense). Publication: Yarza P, Sproer C, Swiderski J, Mrotzek N, Spring S, Tindall BJ, Gronow S, Pukall R, Klenk HP, Lang E, et al. Sequencing orphan species initiative (SOS): Filling the gaps in the 16S rRNA gene sequence database for all species with validly published names. Syst Appl Microbiol 2013; 36:69-73.

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: 773335