Name: Francisellaceae Sjöstedt 2005

Category: Family

Proposed as: fam. nov.

Etymology: Fran.ci.sel.la’ce.ae. N.L. fem. dim. n. Francisella, type genus of the family; L. fem. pl. n. suff. -aceae, ending to denote a family; N.L. fem. pl. n. Francisellaceae, the Francisella family

Pronunciation (Latin), gender: fran-ki-sel-LA-ke-a͡e, feminine

Type genus: Francisella Dorofeev 1947 (Approved Lists 1980)

Effective publication: Sjöstedt AB. Family III. Francisellaceae fam. nov. In: Brenner DJ, Krieg NR, Staley JT, Garrity GM (eds), Bergey's Manual of Systematic Bacteriology, 2nd edn, vol. 2 (The Proteobacteria), part B (The Gammaproteobacteria), Springer, New York, 2005, p. 199-200. 🇺🇸

IJSEM list: Euzeby JP. Validation list no. 106. List of new names and new combinations previously effectively, but not validly, published. Int J Syst Evol Microbiol 2005; 55:2235-2238.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

• Emendations:
  • Boscaro et al. 2012 Boscaro V, Vannini C, Fokin SI, Verni F, Petroni G. Characterization of "Candidatus Nebulobacter yamunensis" from the cytoplasm of Euplotes aediculatus (Ciliophora, Spirotrichea) and emended description of the family Francisellaceae. Syst Appl Microbiol 2012; 35:432-440. 🇮🇹 Euzeby JP. List of changes in taxonomic opinion no. 17. Notification of changes in taxonomic opinion previously published outside the IJSEM. Int J Syst Evol Microbiol 2013; 63:8-9.
    Notes:
    • ⊕ Emendation accompanied by the inclusion of 2 genera in the family.
  • Larson et al. 2016 Larson MA, Nalbantoglu U, Sayood K, Zentz EB, Cer RZ, Iwen PC, Francesconi SC, Bishop-Lilly KA, Mokashi VP, Sjostedt A, et al. Reclassification of Wolbachia persica as Francisella persica comb. nov. and emended description of the family Francisellaceae. Int J Syst Evol Microbiol 2016; 66:1200-1205. 🇺🇸 Oren A, Garrity GM. Notification list. Notification that new names and new combinations have appeared in volume 66, part 3 of the IJSEM. Int J Syst Evol Microbiol 2016; 66:2126-2128.

• Notes:
  • 🧕 Boscaro et al. (2012) assigned this family to the order Thiotrichales Garrity et al. 2005. Publication: Boscaro V, Vannini C, Fokin SI, Verni F, Petroni G. Characterization of "Candidatus Nebulobacter yamunensis" from the cytoplasm of Euplotes aediculatus (Ciliophora, Spirotrichea) and emended description of the family Francisellaceae. Syst Appl Microbiol 2012; 35:432-440. 🇮🇹
  • 🧕 Brenner et al. (2005) assigned this family to the order Thiotrichales Garrity et al. 2005. Publication: Garrity GM, Bell JA, Lilburn T. Order V. Thiotrichales ord. nov. In: Brenner DJ, Krieg NR, Staley JT, Garrity GM (eds), Bergey's Manual of Systematic Bacteriology, 2nd edn, vol. 2 (The Proteobacteria), part B (The Gammaproteobacteria), Springer, New York, 2005, p. 131. 🇺🇸
  • 🧕 Chuvochina et al. (2023) assigned this family to the order Francisellales Chuvochina et al. 2024. Publication: Chuvochina M, Mussig AJ, Chaumeil PA, Skarshewski A, Rinke C, Parks DH, Hugenholtz P. Proposal of names for 329 higher rank taxa defined in the Genome Taxonomy Database under two prokaryotic codes. FEMS Microbiol Lett 2023; 0:0. 🇦🇺
  • 🧒 Boscaro et al. (2012) assigned the genus "Candidatus Nebulobacter" Boscaro et al. 2012 to this family. Publication: Boscaro V, Vannini C, Fokin SI, Verni F, Petroni G. Characterization of "Candidatus Nebulobacter yamunensis" from the cytoplasm of Euplotes aediculatus (Ciliophora, Spirotrichea) and emended description of the family Francisellaceae. Syst Appl Microbiol 2012; 35:432-440. 🇮🇹
  • 🧒 Liu et al. (2017) assigned the genus Cysteiniphilum Liu et al. 2017 to this family. Publication: Liu L, Salam N, Jiao JY, E SM, Chen C, Fang BZ, Xiao M, Li M, Li WJ, Qu PH. Cysteiniphilum litorale gen. nov., sp. nov., isolated from coastal seawater. Int J Syst Evol Microbiol 2017; 67:2178-2183. 🇨🇳
  • 🎰 The BRCs most frequently used for deposits in this group are: DSM: 15; ATCC: 9; CCUG: 7; SYSU: 5; LMG: 4; KCTC: 3; NRRL: 2; NCTC: 2; CGMCC: 2; CIP: 2.

Subdivision:

Number of child taxa with a validly published and correct name: 3
Number of child taxa with a validly published name, including synonyms: 3
Total number of child taxa: 6

• Child taxa:

  • Name	Nomenclatural status	Taxonomic status
    Allofrancisella Qu et al. 2016	validly published under the ICNP	correct name
    Francisella Dorofeev 1947 (Approved Lists 1980)	validly published under the ICNP	correct name
    "Candidatus Nebulibacter" corrig. Boscaro et al. 2012	not validly published	pro-correct name
    "Candidatus Nebulobacter" Boscaro et al. 2012	inaccurate spelling	misspelling
    "Parafrancisella" Öhrman et al. 2021	not validly published	preferred name
    Pseudofrancisella Zheng et al. 2019	validly published under the ICNP	correct name

Parent taxon: Beggiatoales Buchanan 1957 (Approved Lists 1980)

Assigned by: Freese HM, Meier-Kolthoff JP, Sarda Carbasse J, Afolayan AO, Goker M. TYGS and LPSN in 2025: a Global Core Biodata Resource for genome-based classification and nomenclature of prokaryotes within DSMZ Digital Diversity. Nucleic Acids Res 2026; 54:D884-D891. 🇩🇪

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Record number: 536