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

Gender: 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.
  • 🎓 Name mentioned 8 times in PubMed until 2024-03-27.

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