Name: Proteus inconstans (Ornstein 1920) Shaw and Clarke 1955 (Approved Lists 1980)

Category: Species

Proposed as: comb. nov.

Basonym: "Bacillus inconstans" Ornstein 1920

Etymology: in.con.stans. L. adj. inconstans, changeable, inconstant, capricious

Gender: masculine

Type strain: ATCC 9886; CCUG 6325; CIP 82.90; DSM 30120; JCM 1673; NCTC 10286

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AJ301684 Analyse FASTA

Effective publication: Shaw C, Clarke PH. Biochemical classification of Proteus and Providence cultures. J Gen Microbiol 1955; 13:155-161.

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: Providencia alcalifaciens (de Salles Gomes 1944) Ewing 1962 (Approved Lists 1980)

Risk group: 2

• Synonyms:

  • Name	Kind
    "Bacillus inconstans" Ornstein 1920	homotypic synonym, not validly published, basonym of name in Approved Lists
    "Eberthella alcalifaciens" de Salles Gomes 1944	homotypic synonym, not validly published, basonym of name in Approved Lists
    Providencia alcalifaciens (de Salles Gomes 1944) Ewing 1962 (Approved Lists 1980)	homotypic synonym, validly published under the ICNP

• Notes:
  • ❗ Proteus inconstans 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 Proteus.
  • 😷 The risk group for Belgium has been imported on 2024-02-05. The full classification is: risk group = 2, note = "human pathogen". — The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 2, note = "Animal classification RG: 1 - Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No - Containment level: Containment Level 2". — The risk group for Swiss Confederation has been imported on 2024-02-01. The full classification is: risk group = 2. — The risk group for Germany has been imported on 2023-10-29. The full classification is: risk group = 2, note = "ht".
  • 🎓 Name mentioned 20 times in PubMed until 2024-03-28.
  • 🧍 On the Approved Lists of Bacterial Names and on the Approved Lists of Bacterial Names (Amended Edition) this nomenclatural name is incorrectly cited as Proteus inconstans (Orstein [sic] 1920) Shaw and Clarke 1955. — 🧍 On the Approved Lists of Bacterial Names incorrectly cited as Proteus inconstans (Orstein [sic] 1920) Shaw and Clarke 1955; name not in current usage; regarded as synonym of Providencia alcalifaciens, P. rustigianii or P. stuartii. Publication: Skerman VBD, McGowan V, Sneath PHA. Approved lists of bacterial names. Int J Syst Bacteriol 1980; 30:225-420.
  • 🧍 The name Proteus inconstans is not in current usage. According to Brenner et al. [1] and to Hickman-Brenner et al. [2], (i) the strains gas -, inositol + of Proteus inconstans should be regarded as synonym of Providencia stuartii (Buttiaux et al. 1954) Ewing 1962; (ii) the strains gas +, inositol -, adonitol + should be regarded as synonym of Providencia alcalifaciens (de Salles Gomes 1944) Ewing 1962; and (iii) the strains glucose +, inositol -, adonitol - should be regarded as synonym of Providencia rustigianii Hickman-Brenner et al. 1983. Publication: Hickman-Brenner FW, Farmer JJ, Steigerwalt AG, Brenner DJ. Providencia rustigianii: a new species in the family Enterobacteriaceae formerly known as Providencia alcalifaciens biogroup 3. J Clin Microbiol 1983; 17:1057-1060.

Parent taxon: Proteus Hauser 1885 (Approved Lists 1980)

Assigned by: Shaw C, Clarke PH. Biochemical classification of Proteus and Providence cultures. J Gen Microbiol 1955; 13:155-161.

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Record number: 779873