Name: Ancylobacter aquaticus (Ørskov 1928) Raj 1983

Category: Species

Proposed as: comb. nov.

Basonym: Microcyclus aquaticus Ørskov 1928 (Approved Lists 1980)

Etymology: a.qua’ti.cus. L. masc. adj. aquaticus, living, growing, or found in or by the water, aquatic

Pronunciation (Latin), gender: … a-KWA-ti-kus, masculine

Type strain: ATCC 25396; CCUG 1820; CCUG 30551; DSM 101; JCM 20518; LMG 4052; NBRC 102453; Ørskov; VKM B-1287

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: M62790 Analyse FASTA

Valid publication: Raj HD. Proposal of Ancylobacter gen. nov. as a substitute for the bacterial genus Microcyclus Ørskov 1928. Int. J. Syst. Bacteriol. 1983; 33:397-398.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

Risk group: 1

• Synonyms:

  • Name	Kind
    Microcyclus aquaticus Ørskov 1928 (Approved Lists 1980)	homotypic synonym, validly published under the ICNP, illegitimate name

• Emendations:
  • Hördt et al. 2020 Hordt A, Lopez MG, Meier-Kolthoff JP, Schleuning M, Weinhold LM, Tindall BJ, Gronow S, Kyrpides NC, Woyke T, Goker M. Analysis of 1,000+ Type-Strain Genomes Substantially Improves Taxonomic Classification of Alphaproteobacteria. Front Microbiol 2020; 11:468. 🇩🇪 Oren A, Garrity GM. List of changes in taxonomic opinion no. 32. Notification of changes in taxonomic opinion previously published outside the IJSEM. Int J Syst Evol Microbiol 2020; 70:4061-4090.

• Notes:
  • 🥇 Nomenclatural type of the genus Ancylobacter Raj 1983. Publication: Raj HD. Proposal of Ancylobacter gen. nov. as a substitute for the bacterial genus Microcyclus Ørskov 1928. Int. J. Syst. Bacteriol. 1983; 33:397-398.
  • 😷 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 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 28 times in PubMed until 2025-06-04.
  • 🧍 Replacement of the illegitimate name Microcyclus aquaticus Ørskov 1928 (Approved Lists 1980), which is illegitimate because of precedence of the fungal genus Microcyclus Saccardo 1904 [Rule 51b (4)]. Publication: Oerskov J. Beschreibung eines neuen Mikroben, Microcyclus aquaticus, mit eigentümlicher Morphologie. Zentralblatt fur Bakteriologie, Parasitenkunde, Infektionskrankheiten und Hygiene. Abteilung I 1928; 107:180-184.

Parent taxon: Ancylobacter Raj 1983

Assigned by: Raj HD. Proposal of Ancylobacter gen. nov. as a substitute for the bacterial genus Microcyclus Ørskov 1928. Int. J. Syst. Bacteriol. 1983; 33:397-398.

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Record number: 773268