Name: Thiobacillus caldus Hallberg and Lindström 1995

Category: Species

Proposed as: sp. nov.

Etymology: cal’dus. L. masc. adj. caldus, warm, hot, intended to mean liking warmth

Pronunciation, gender: KAL-dus, masculine

Type strain: ATCC 51756; DSM 8584; KU

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: MN218417 Analyse FASTA

Effective publication: Hallberg KB, Lindstrom EB. Characterization of Thiobacillus caldus sp. nov., a moderately thermophilic acidophile. Microbiology 1994; 140:3451-3456.

IJSEM list: Anonymous. Validation list no. 54. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1995; 45:619-620.

Nomenclatural status: validly published under the ICNP

Taxonomic status: synonym

Correct name: Acidithiobacillus caldus (Hallberg and Lindström 1995) Kelly and Wood 2000

Risk group: 1

• Synonyms:

  • Name	Kind
    Acidithiobacillus caldus (Hallberg and Lindström 1995) Kelly and Wood 2000	homotypic synonym, validly published under the ICNP
    "Fervidacidithiobacillus caldus" (Hallberg and Lindström 1995) Moya-Beltrán et al. 2021	homotypic synonym, not validly published

• Notes:
  • 📧 The e-mail address of the corresponding author given in the effective publication is not functional any more.
  • ❗ Thiobacillus caldus 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 = "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 8 times in PubMed until 2025-06-04.

Parent taxon: Thiobacillus Beijerinck 1904 (Approved Lists 1980)

Assigned by: Hallberg KB, Lindstrom EB. Characterization of Thiobacillus caldus sp. nov., a moderately thermophilic acidophile. Microbiology 1994; 140:3451-3456.

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Record number: 782707