Name: Gracilinema caldarium (Pohlschröder et al. 1995) Brune et al. 2022

Category: Species

Proposed as: comb. nov.

Basonym: Spirochaeta caldarium Pohlschröder et al. 1995

Etymology: cal.da’ri.um. L. neut. adj. caldarium, pertaining to warm water, intended to mean inhabiting warm water

Gender: neuter

Type strain: ATCC 51460; DSM 7334; H1

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: EU580141 Analyse FASTA

Valid publication: Brune A, Song Y, Oren A, Paster BJ. A new family for 'termite gut treponemes': description of Breznakiellaceae fam. nov., Gracilinema caldarium gen. nov., comb. nov., Leadbettera azotonutricia gen. nov., comb. nov., Helmutkoenigia isoptericolens gen. nov., comb. nov., and Zuelzera stenostrepta gen. nov., comb. nov., and proposal of Rectinemataceae fam. nov. Int J Syst Evol Microbiol 2022; 72:5439.

IJSEM list: Oren A, Garrity GM. Notification list. Notification that new names and new combinations have appeared in volume 72, part 5 of the IJSEM. Int J Syst Evol Microbiol 2022; 72:5476.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

• Synonyms:

  • Name	Kind
    Treponema caldarium corrig. (Pohlschröder et al. 1995) Abt et al. 2013	homotypic synonym, validly published under the ICNP
    Spirochaeta caldarium Pohlschröder et al. 1995	homotypic synonym, inaccurate spelling
    Treponema caldaria (Pohlschröder et al. 1995) Abt et al. 2013	homotypic synonym, inaccurate spelling
    Spirochaeta caldaria corrig. Pohlschröder et al. 1995	homotypic synonym, validly published under the ICNP

• Notes:
  • 🥇 Nomenclatural type of the genus Gracilinema Brune et al. 2022. Publication: Brune A, Song Y, Oren A, Paster BJ. A new family for 'termite gut treponemes': description of Breznakiellaceae fam. nov., Gracilinema caldarium gen. nov., comb. nov., Leadbettera azotonutricia gen. nov., comb. nov., Helmutkoenigia isoptericolens gen. nov., comb. nov., and Zuelzera stenostrepta gen. nov., comb. nov., and proposal of Rectinemataceae fam. nov. Int J Syst Evol Microbiol 2022; 72:5439.
  • 😢 The terminology used by the authors is in line with many other taxonomic studies and does not negatively affect their main results; some improvements may nevertheless be possible. The phrase "validly described" is misleading. Whether taxa can have "members" is debatable. See the LPSN phylogeny page for details. Publication: Göker M. What can genome analysis offer for bacteria? In: Bridge P, Smith D, Stackebrandt E (eds), Trends in the systematics of bacteria and fungi, CAB International, Wallingford, 2021, p. 255-281.
  • 🎓 Name mentioned 1 time in PubMed until 2024-03-27.
  • 🧍 As of 2022-08-12 this emendation was not yet included in an IJSEM List of Changes in Taxonomic Opinion.

Parent taxon: Gracilinema Brune et al. 2022

Assigned by: Brune A, Song Y, Oren A, Paster BJ. A new family for 'termite gut treponemes': description of Breznakiellaceae fam. nov., Gracilinema caldarium gen. nov., comb. nov., Leadbettera azotonutricia gen. nov., comb. nov., Helmutkoenigia isoptericolens gen. nov., comb. nov., and Zuelzera stenostrepta gen. nov., comb. nov., and proposal of Rectinemataceae fam. nov. Int J Syst Evol Microbiol 2022; 72:5439.

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Record number: 28800