Name: Microcyclus aquaticus Ørskov 1928 (Approved Lists 1980)

Category: Species

Proposed as: sp. nov.

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

Effective 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.

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, illegitimate name

Taxonomic status: synonym

Correct name: Ancylobacter aquaticus (Ørskov 1928) Raj 1983

Risk group: 1

• Synonyms:

  • Name	Kind
    Ancylobacter aquaticus (Ørskov 1928) Raj 1983	homotypic synonym, validly published under the ICNP

• Notes:
  • 🥇 Nomenclatural type of the genus Microcyclus Ørskov 1928 (Approved Lists 1980). 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.
  • 😷 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 11 times in PubMed until 2025-06-04.
  • 🧍 Microcyclus aquaticus is illegitimate because of precedence of the fungal genus Microcyclus Saccardo 1904 [Rule 51b (4)]. 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.

Parent taxon: Microcyclus Ørskov 1928 (Approved Lists 1980)

Assigned by: Oerskov J. Beschreibung eines neuen Mikroben, Microcyclus aquaticus, mit eigentümlicher Morphologie. Zentralblatt fur Bakteriologie, Parasitenkunde, Infektionskrankheiten und Hygiene. Abteilung I. 1928; 107:180-184.

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Record number: 778137