Name: Cytophaga aquatilis Strohl and Tait 1978 (Approved Lists 1980)

Category: Species

Proposed as: sp. nov.

Etymology: a.qua’ti.lis. L. fem. adj. aquatilis, living, growing, or found in water, aquatic

Pronunciation, gender: a-KWA-ti-lis, feminine

Type strain: ATCC 29551; CCUG 35201; CIP 104741; DSM 2063; IFO 14958; JCM 20519; LMG 8385; NBRC 14958; NRRL B-14732

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: M58764 Analyse FASTA

Effective publication: Strohl WR, Tait LR. Cytophaga aquatilis sp. nov., a facultative anaerobe isolated from the gills of freshwater fish. International Journal of Systematic Bacteriology 1978; 28:293-303.

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: Flavobacterium hydatis Bernardet et al. 1996

Risk group: 2

• Synonyms:

  • Name	Kind
    Flavobacterium hydatis Bernardet et al. 1996	homotypic synonym, validly published under the ICNP

• Notes:
  • ❗ Cytophaga aquatilis 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 Cytophaga.
  • 😷 The risk group for Swiss Confederation has been imported on 2024-02-01. The full classification is: risk group = 2, note = "PV". — The risk group for Germany has been imported on 2023-10-29. The full classification is: risk group = 1, note = "t2". — 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 species itself.

Parent taxon: Cytophaga Winogradsky 1929 (Approved Lists 1980)

Assigned by: Strohl WR, Tait LR. Cytophaga aquatilis sp. nov., a facultative anaerobe isolated from the gills of freshwater fish. International Journal of Systematic Bacteriology 1978; 28:293-303.

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Record number: 775385