Name: Caldicellulosiruptor lactoaceticus Mladenovska et al. 1997

Category: Species

Proposed as: sp. nov.

Etymology: lac.to.a.ce’ti.cus. N.L. neut. adj. lacticum, lactic; from L. neut. n. lac (gen. lactis), milk; N.L. masc. adj. aceticus, acetic; from L. neut. n. acetum, vinegar; N.L. masc. adj. lactoaceticus, referring to production of lactic and acetic acids as major fermentation products

Pronunciation, gender: … lak-to-a-KE-ti-kus, masculine

Type strain: 6A; ATCC TSD-470; DSM 9545

Conduct genome-based taxonomy at

16S rRNA gene: X82842 Analyse FASTA

Effective publication: Mladenovska Z, Mathrani IM, Ahring BK. Isolation and characterization of Caldicellulosiruptor lactoaceticus sp. nov., an extremely thermophilic, cellulolytic, anaerobic bacterium. Arch. Microbiol. 1995; 163:223-230.

IJSEM list: Anonymous. Validation list no. 63. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1997; 47:1274.

Nomenclatural status: validly published under the ICNP

Taxonomic status: synonym

Correct name: Caldicellulosiruptor acetigenus (Nielsen et al. 1994) Onyenwoke et al. 2006

Risk group: 1

• Synonyms:

  • Name	Kind
    Caldicellulosiruptor kristjanssonii Bredholt et al. 1999	heterotypic synonym, validly published under the ICNP
    "Anaerocellum acetigenus subsp. kristjanssonii" (Bredholt et al. 1999) Bing 2024	heterotypic synonym, not validly published, distinct rank
    "Anaerocellum acetigenus" (Nielsen et al. 1994) Bing 2024	heterotypic synonym, not validly published
    Thermoanaerobium acetigenum Nielsen et al. 1994	heterotypic synonym, validly published under the ICNP
    "Anaerocellum acetigenus subsp. lactoaceticus" (Mladenovska et al. 1997) Bing 2024	homotypic synonym, not validly published, distinct rank
    Caldicellulosiruptor acetigenus (Nielsen et al. 1994) Onyenwoke et al. 2006	heterotypic synonym, validly published under the ICNP

• Notes:
  • ⏲ According to Habib et al. (2021), this species is a later heterotypic synonym of Thermoanaerobium acetigenum Nielsen et al. 1994. Publication: Habib N, Rao MPN, Xiao M, Jan SA, Li WJ. Genome-based reclassification of Caldicellulosiruptor lactoaceticus and Caldicellulosiruptor kristjanssonii as later heterotypic synonyms of Caldicellulosiruptor acetigenus. Int J Syst Evol Microbiol 2021; 71:4927. 🇨🇳
  • ⏲ According to Habib et al. (2021), this species is a later heterotypic synonym of Caldicellulosiruptor acetigenus (Nielsen et al. 1994) Onyenwoke et al. 2006. Publication: Habib N, Rao MPN, Xiao M, Jan SA, Li WJ. Genome-based reclassification of Caldicellulosiruptor lactoaceticus and Caldicellulosiruptor kristjanssonii as later heterotypic synonyms of Caldicellulosiruptor acetigenus. Int J Syst Evol Microbiol 2021; 71:4927. 🇨🇳
  • ⏲ According to Habib et al. (2021), this species is a later heterotypic synonym of "Anaerocellum acetigenus" (Nielsen et al. 1994) Bing 2024. Publication: Habib N, Rao MPN, Xiao M, Jan SA, Li WJ. Genome-based reclassification of Caldicellulosiruptor lactoaceticus and Caldicellulosiruptor kristjanssonii as later heterotypic synonyms of Caldicellulosiruptor acetigenus. Int J Syst Evol Microbiol 2021; 71:4927. 🇨🇳
  • 🏢 Synonymy of this taxon was mentioned in an IJSEM list. Publication: Oren A, Garrity GM. Notification list. Notification that new names and new combinations have appeared in volume 71, part 8 of the IJSEM. Int J Syst Evol Microbiol 2021; 71:5057.
  • ❗ Caldicellulosiruptor lactoaceticus 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 Caldicellulosiruptor.
  • 😷 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 5 times in PubMed until 2025-06-04.

Parent taxon: Caldicellulosiruptor Rainey et al. 1995

Assigned by: Mladenovska Z, Mathrani IM, Ahring BK. Isolation and characterization of Caldicellulosiruptor lactoaceticus sp. nov., an extremely thermophilic, cellulolytic, anaerobic bacterium. Arch. Microbiol. 1995; 163:223-230.

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Record number: 774344