Name: Thermus scotoductus Kristjansson et al. 1994

Category: Species

Proposed as: sp. nov.

Etymology: sco.to.duc’tus. Gr. masc. n. skotos, darkness; L. masc. n. ductus, Roman water duct; N.L. masc. n. scotoductus, intended to mean living in pipes and producing a dark pigment

Pronunciation, gender: sko-to-DUK-tus, masculine

Type strain: ATCC 51532; DSM 8553; JCM 11601; Strain SE-1

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AF032127 Analyse FASTA

Effective publication: Kristjansson JK, Hjorleifsdottir S, Marteinsson VT, Alfredsson GA. Thermus scotoductus, sp. nov., a pigment-producing thermophilic bacterium from hot tap water in Iceland and including Thermus sp. X-1. Syst. Appl. Microbiol. 1994; 17:44-50.

IJSEM list: Anonymous. Validation list no. 53. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1995; 45:418-419.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

Risk group: 1

• Notes:
  • 🧬 The phylogenomic assignment score of this taxon is 0.21032 (N = 2).
  • 😷 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 64 times in PubMed until 2025-06-04.
  • 🧍 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.
  • 🧍 Validation repeated in List No 53, IJSB 45:418. Publication: Anonymous. Validation list no. 53. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1995; 45:418-419.
  • 🧍 The date of valid publication of this name is in fact that of the first citation in a Validation List (List no. 50, published 1 July 1994) [2]. Publication: Euzeby JP, Kudo T. Corrigenda to the validation lists. Int J Syst Evol Microbiol 2001; 51:1933-1938.
  • 🧍 The species Thermus scotoductus (effective publication: Kristjansson et al. 1994, type strain: strain SE-1 = DSM 8553 = ATCC 51532) appears also on the Validation List no. 53 [1]. The date of valid publication of this name is in fact that of the first citation in a Validation List (List no. 50, published 1 July 1994) [2]. Publication: Anonymous. Validation list no. 53. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1995; 45:418-419.

Parent taxon: Thermus Brock and Freeze 1969 (Approved Lists 1980)

Assigned by: Kristjansson JK, Hjorleifsdottir S, Marteinsson VT, Alfredsson GA. Thermus scotoductus, sp. nov., a pigment-producing thermophilic bacterium from hot tap water in Iceland and including Thermus sp. X-1. Syst. Appl. Microbiol. 1994; 17:44-50.

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Record number: 782667