Name: "Candidatus Paracaedibacter" Horn et al. 1999

Category: Genus

Proposed as: Candidatus

Etymology: Pa.ra.cae.di.bac’ter. N.L. masc. n. bacter, rod; N.L. masc. n. Paracaedibacter, a Candidatus genus name

Gender, pronunciation (Latin): masculine (stem: Paracaedibacter-), pa-ra-ka͡e-di-BAK-ter

Type species: "Candidatus Paracaedibacter acanthamoebae" Horn et al. 1999

16S rRNA gene: Analyse FASTA

Effective publication: Horn M, Fritsche TR, Gautom RK, Schleifer KH, Wagner M. Novel bacterial endosymbionts of Acanthamoeba spp. related to the Paramecium caudatum symbiont Caedibacter caryophilus. Environ Microbiol 1999; 1:357-367. 🇩🇪

IJSEM list: Oren A, Garrity GM, Parker CT, Chuvochina M, Trujillo ME. Candidatus list no. 1. Lists of names of prokaryotic Candidatus taxa. Int J Syst Evol Microbiol 2020; 70:3956-4042.

Nomenclatural status: not validly published

Nomenclatural pro-status: pro-validly published under the ICNP

Taxonomic status: pro-correct name

• Emendations:
  • Castelli and Petroni 2025 Castelli M, Petroni G. An Evolutionary-Focused Review of the Holosporales (Alphaproteobacteria): Diversity, Host Interactions, and Taxonomic Re-ranking as Holosporineae Subord. Nov. Microb Ecol 2025; 88:15. 🇮🇹

• Notes:
  • 🥇 Nomenclatural type of the family "Candidatus Paracaedibacteraceae" Hess et al. 2016. Publication: Hess S, Suthaus A, Melkonian M. "Candidatus Finniella" (Rickettsiales, Alphaproteobacteria), Novel Endosymbionts of Viridiraptorid Amoeboflagellates (Cercozoa, Rhizaria). Appl Environ Microbiol 2016; 82:659-670. 🇩🇪
  • 🥇 Nomenclatural type of the order "Candidatus Paracaedibacterales" Chuvochina et al. 2023. 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. 🇦🇺
  • 🧕 Brenner et al. (2005) assigned this genus to the family Holosporaceae Görtz and Schmidt 2006. Publication: Görtz HD, Schmidt HJ. Family III. Holosporaceae 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 C (The Alpha-, Beta-, Delta-, and Epsilonproteobacteria), Springer, New York, 2005, p. 146-149. 🇺🇸
  • 🧕 Chuvochina et al. (2023) assigned this genus to the order "Candidatus Paracaedibacterales" Chuvochina et al. 2023. 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. 🇦🇺
  • 🧕 Horn et al. (1999) assigned this genus to the class "Alphaproteobacteria". Publication: Horn M, Fritsche TR, Gautom RK, Schleifer KH, Wagner M. Novel bacterial endosymbionts of Acanthamoeba spp. related to the Paramecium caudatum symbiont Caedibacter caryophilus. Environ Microbiol 1999; 1:357-367. 🇩🇪
  • 🚋 The type species of this genus has alternatively been placed in the genus "Candidatus Odyssella" Birtles et al. 2000. Publication: Castelli M, Petroni G. An Evolutionary-Focused Review of the Holosporales (Alphaproteobacteria): Diversity, Host Interactions, and Taxonomic Re-ranking as Holosporineae Subord. Nov. Microb Ecol 2025; 88:15. 🇮🇹
  • 🙄 This taxon name is occasionally misprinted (or affected by an OCR error) in some sources as: "Paracaedibacte".
  • 📧 The e-mail address of the corresponding author given in the effective publication is not functional any more.

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
    "Candidatus Paracaedibacter acanthamoebae" Horn et al. 1999	not validly published	pro-correct name
    "Candidatus Paracaedibacter symbiosus" Horn et al. 1999	not validly published	pro-correct name

Parent taxon: "Candidatus Paracaedibacteraceae" Hess et al. 2016

Assigned by: Hess S, Suthaus A, Melkonian M. "Candidatus Finniella" (Rickettsiales, Alphaproteobacteria), Novel Endosymbionts of Viridiraptorid Amoeboflagellates (Cercozoa, Rhizaria). Appl Environ Microbiol 2016; 82:659-670. 🇩🇪

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Record number: 18340