Name: Meiothermus timidus Pires et al. 2005

Category: Species

Proposed as: sp. nov.

Etymology: ti’mi.dus. L. masc. adj. timidus, timid, because only one strain was recovered from the hot spring at São Pedro do Sul after the isolation of so many organisms, over several years, from this site

Pronunciation (Latin), gender: me-io-T^HER-mus TI-mi-dus, masculine

Type strain: CIP 108604; DSM 17022; LMG 22897; NBRC 103207; SPS-243

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AJ871168 Analyse FASTA

Effective publication: Pires AL, Albuquerque L, Tiago I, Nobre MF, Empadinhas N, Verissimo A, da Costa MS. Meiothermus timidus sp. nov., a new slightly thermophilic yellow-pigmented species. FEMS Microbiol Lett 2005; 245:39-45. 🇵🇹

IJSEM list: Euzeby JP. Validation list no. 104. List of new names and new combinations previously effectively, but not validly, published. Int J Syst Evol Microbiol 2005; 55:1395-1397.

Nomenclatural status: validly published under the ICNP

Taxonomic status: synonym

Correct name: Calidithermus timidus (Pires et al. 2005) Raposo et al. 2019

Risk group: 1

• Synonyms:

  • Name	Kind
    Calidithermus timidus (Pires et al. 2005) Raposo et al. 2019	homotypic synonym, validly published under the ICNP

• Notes:
  • ❗ Meiothermus timidus 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 Meiothermus.
  • 😷 The risk group for Germany has been imported on 2026-08-13. 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 4 times in PubMed until 2026-06-11.
  • 🧍 The genome of the type strain was sequenced as part of the GEBA (Genomic Encyclopedia of Bacteria and Archaea) project. Publication: Garcia-Lopez M, Meier-Kolthoff JP, Tindall BJ, Gronow S, Woyke T, Kyrpides NC, Hahnke RL, Goker M. Analysis of 1,000 Type-Strain Genomes Improves Taxonomic Classification of Bacteroidetes. Front Microbiol 2019; 10:2083. 🇩🇪

Parent taxon: Meiothermus Nobre et al. 1996

Assigned by: Pires AL, Albuquerque L, Tiago I, Nobre MF, Empadinhas N, Verissimo A, da Costa MS. Meiothermus timidus sp. nov., a new slightly thermophilic yellow-pigmented species. FEMS Microbiol Lett 2005; 245:39-45. 🇵🇹

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Record number: 777755