Name: "Caldatribacterium" Hedlund et al. 2026

Category: Genus

Proposed as: gen. nov.

Etymology: Cal.da.tri.bac.te’ri.um. L. adj. kal -di, hot; L. adj. ater -tra -trum, black; N.L. neut. n. bacterium, rod or staff; N.L. neut. n. Caldatribacterium, ‘black’ or ‘dark’ references both ‘microbial dark matter, ’ referring to the poor culturability of the genus and phylum, and the dark, anoxic environments where it is found

Gender, pronunciation (Latin): neuter (stem: Caldatribacteri-), kal-da-tri-bak-TE-ri-um

Conduct genome-based taxonomy of genus at TYGS

16S rRNA gene: Analyse FASTA

Original publication: Hedlund BP, Alvarado T, Sushenko NS, Murphy TR, Torres A, Blocker AM, Lai D, Mayali X, Seymour CO, Muok A, et al. Isolation of genome-predicted Caldatribacterium (Atribacterota) reveals pervasive microbial cultivation problem due to folate precipitation. Nat Commun 2026; 0:0. 🇺🇸

Nomenclatural status: not validly published

Taxonomic status: preferred name (not correct name)

• Notes:
  • 🥇 Nomenclatural type of the family "Caldatribacteriaceae" Hedlund et al. 2026. Publication: Hedlund BP, Alvarado T, Sushenko NS, Murphy TR, Torres A, Blocker AM, Lai D, Mayali X, Seymour CO, Muok A, et al. Isolation of genome-predicted Caldatribacterium (Atribacterota) reveals pervasive microbial cultivation problem due to folate precipitation. Nat Commun 2026; 0:0. 🇺🇸
  • 🙄 This taxon name is occasionally misprinted (or affected by an OCR error) in some sources as: "Caldiatribacterium". — 🤨 This taxon name is occasionally used in plural form as: "Caldatribacteria".
  • 😡 This taxon name is a homonym of "Candidatus Caldatribacterium" Dodsworth et al. 2013.

Subdivision:

Number of child taxa with a validly published and correct name: 0
Number of child taxa with a validly published name, including synonyms: 0
Total number of child taxa: 2

• Child taxa:

  • Name	Nomenclatural status	Taxonomic status
    "Caldatribacterium inferamans" Hedlund et al. 2026	not validly published	preferred name
    "Caldatribacterium saccharofermentans" Hedlund et al. 2026	not validly published	preferred name

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Record number: 73115