Name: Caldicellulosiruptor bescii Yang et al. 2010

Category: Species

Proposed as: sp. nov.

Etymology: besc’i.i. N.L. gen. neut. n. bescii, of BESC, the BioEnergy Science Center of the US Department of Energy located in Oak Ridge, TN, USA.

Gender: masculine

Type strain: ATCC BAA-1888; DSM 6725

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: CP001393 Analyse FASTA

Valid publication: Yang SJ, Kataeva I, Wiegel J, Yin Y, Dam P, Xu Y, Westpheling J, Adams MW. Classification of 'Anaerocellum thermophilum' strain DSM 6725 as Caldicellulosiruptor bescii sp. nov. Int J Syst Evol Microbiol 2010; 60:2011-2015.

IJSEM list: Euzeby JP. Notification list. Notification that new names and new combinations have appeared in volume 60, part 9 of the IJSEM. Int J Syst Evol Microbiol 2010; 60:2695-2696.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

Risk group: 1

• Notes:
  • 🧬 The phylogenomic assignment score of this taxon is 0.30219 (N = 4).
  • 😷 The risk group for Germany has been imported on 2023-10-29. The full classification is: risk group = 1.
  • 🎓 Name mentioned 124 times in PubMed until 2024-03-27.
  • 🧍 Strain Z- 1320 of "Anaerocellum thermophilum" Svetlichnyi et al. 1990, was deposited in the DSMZ as DSM 6725. The organism was classified as a new genus "Anaerocellum" primarily based on growth physiology, cell wall type and morphology. The results of recent physiological studies and of phylogenetic and genome sequence analyses of the strain DSM 6725 show that its properties differ from those originally described for strain Z-1320. Moreover, the 16S rRNA sequence of strain DSM 6725 falls within the Caldicellulosiruptor clade. Yang et al. therefore reclassify "Anaerocellum thermophilum" as Caldicellulosiruptor bescii sp. nov. (type strain DSM 6725 = ATCC BAA-1888). Publication: Rainey FA, Donnison AM, Janssen PH, Saul D, Rodrigo A, Bergquist PL, Daniel RM, Stackebrandt E, Morgan HW. Description of Caldicellulosiruptor saccharolyticus gen. nov., sp. nov: an obligately anaerobic, extremely thermophilic, cellulolytic bacterium. FEMS Microbiol Lett 1994; 120:263-266.

Parent taxon: Caldicellulosiruptor Rainey et al. 1995

Assigned by: Yang SJ, Kataeva I, Wiegel J, Yin Y, Dam P, Xu Y, Westpheling J, Adams MW. Classification of 'Anaerocellum thermophilum' strain DSM 6725 as Caldicellulosiruptor bescii sp. nov. Int J Syst Evol Microbiol 2010; 60:2011-2015.

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Record number: 788733