Name: Thiobacillus thiooxidans Waksman and Joffe 1922 (Approved Lists 1980)

Category: Species

Proposed as: sp. nov.

Etymology: thi.o.o.xi’dans. Gr. neut. n. theîon, sulfur; N.L. pres. part. oxidans, oxidizing; N.L. masc. part. adj. thiooxidans, oxidizing sulfur

Pronunciation, gender: t^hi-o-o-KSI-dans, masculine

Type strain: ATCC 19377; CIP 104597; DSM 14887; JCM 3867; NCIB 8343; NCIMB 8343

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: Y11596 Analyse FASTA

Effective publication: Waksman SA, Joffe JS. Microorganisms Concerned in the Oxidation of Sulfur in the Soil: II. Thiobacillus Thiooxidans, a New Sulfur-oxidizing Organism Isolated from the Soil. J Bacteriol 1922; 7:239-256.

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: Acidithiobacillus thiooxidans (Waksman and Joffe 1922) Kelly and Wood 2000

Risk group: 1

• Synonyms:

  • Name	Kind
    Thiobacillus concretivorus Parker 1945 (Approved Lists 1980)	heterotypic synonym, validly published under the ICNP
    Acidithiobacillus thiooxidans (Waksman and Joffe 1922) Kelly and Wood 2000	homotypic synonym, validly published under the ICNP
    Acidithiobacillus concretivorus (Parker 1945) Boden and Hutt 2021	heterotypic synonym, validly published under the ICNP

• Notes:
  • ⏰ According to Kelly and Wood (2000), this species is an earlier heterotypic synonym of Acidithiobacillus concretivorus (Parker 1945) Boden and Hutt 2021. Publication: Kelly DP, Wood AP. Reclassification of some species of Thiobacillus to the newly designated genera Acidithiobacillus gen. nov., Halothiobacillus gen. nov. and Thermithiobacillus gen. nov. Int J Syst Evol Microbiol 2000; 50:511-516.
  • ⏰ According to Kelly and Wood (2000), this species is an earlier heterotypic synonym of Thiobacillus concretivorus Parker 1945 (Approved Lists 1980). Publication: Kelly DP, Wood AP. Reclassification of some species of Thiobacillus to the newly designated genera Acidithiobacillus gen. nov., Halothiobacillus gen. nov. and Thermithiobacillus gen. nov. Int J Syst Evol Microbiol 2000; 50:511-516.
  • ❗ Thiobacillus thiooxidans 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 Thiobacillus.
  • 😷 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. — 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 135 times in PubMed until 2025-06-04.

Parent taxon: Thiobacillus Beijerinck 1904 (Approved Lists 1980)

Assigned by: Waksman SA, Joffe JS. Microorganisms Concerned in the Oxidation of Sulfur in the Soil: II. Thiobacillus Thiooxidans, a New Sulfur-oxidizing Organism Isolated from the Soil. J Bacteriol 1922; 7:239-256.

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Record number: 782721