Name: Holospora (ex Hafkine 1890) Gromov and Ossipov 1981

Category: Genus

Proposed as: gen. nov., nom. rev.

Etymology: Ho.lo’spo.ra. Gr. masc. adj. holos, whole, entire, complete in all its parts; Gr. fem. n. spora, seed (in biology, a spore); N.L. fem. n. Holospora, whole spore

Gender, pronunciation: feminine (stem: Holospor-), ho-LO-spo-ra

Type species: Holospora undulata (ex Hafkine 1890) Gromov and Ossipov 1981

Valid publication: Gromov BV, Ossipov DV. Holospora (ex Hafkine 1890) nom. rev., a genus of bacteria inhabiting the nuclei of paramecia. Int. J. Syst. Bacteriol. 1981; 31:348-352.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

• Notes:
  • 🥇 Nomenclatural type of 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.
  • 🥇 Nomenclatural type of the order Holosporales Szokoli et al. 2020. Publication: Szokoli F, Castelli M, Sabaneyeva E, Schrallhammer M, Krenek S, Doak TG, Berendonk TU, Petroni G. Disentangling the Taxonomy of Rickettsiales and Description of Two Novel Symbionts ("Candidatus Bealeia paramacronuclearis" and "Candidatus Fokinia cryptica") Sharing the Cytoplasm of the Ciliate Protist Paramecium biaurelia. Appl Environ Microbiol 2016; 82:7236-7247.
  • 🥇 Nomenclatural type of the suborder Holosporineae (Szokoli et al. 2020) Castelli and Petroni 2025. 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.
  • 🧕 Castelli and Petroni (2025) assigned this genus to the suborder Holosporineae (Szokoli et al. 2020) Castelli and Petroni 2025. 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.
  • 🧕 Szokoli et al. (2016) assigned this genus to the order Holosporales Szokoli et al. 2020. Publication: Szokoli F, Castelli M, Sabaneyeva E, Schrallhammer M, Krenek S, Doak TG, Berendonk TU, Petroni G. Disentangling the Taxonomy of Rickettsiales and Description of Two Novel Symbionts ("Candidatus Bealeia paramacronuclearis" and "Candidatus Fokinia cryptica") Sharing the Cytoplasm of the Ciliate Protist Paramecium biaurelia. Appl Environ Microbiol 2016; 82:7236-7247.
  • 🚋 The type species of this genus has alternatively been placed in the genus Holospora (ex Hafkine 1890) Preer and Preer 1982. Publication: Preer Jr. JR, Preer LB. Revival of names of protozoan endosymbionts and proposal of Holospora caryophila nom. nov. Int. J. Syst. Bacteriol. 1982; 32:140-141.
  • 🙄 This taxon name is occasionally misprinted (or affected by an OCR error) in some sources as: "Halaspora"; "Ilolospora"; "Iolospora"; "Jlolospora"; "Jolospora"; "Molospora"; "Tolospora"; "Zlolospora"; "Zolospora".
  • 😡 This taxon name is a homonym of Holospora (ex Hafkine 1890) Preer and Preer 1982.
  • 🧍 Pittman et al. (1991) suggested the abbreviation "HOSO" for this genus name but this does not appear to be of practical relevance any longer. Publication: Pittman KF, Walczak CA, Lock CM. Codes and abbreviations for approved of effectively published names of genera of bacteria published from January 1980 to December 1990. Int J Syst Bacteriol 1991; 41:571-579.

Subdivision:

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

• Child taxa:

  • Name	Nomenclatural status	Taxonomic status
    Holospora obtusa (ex Hafkine 1890) Gromov and Ossipov 1981	validly published under the ICNP	correct name
    Holospora undulata (ex Hafkine 1890) Gromov and Ossipov 1981	validly published under the ICNP	correct name

Parent taxon: Holosporaceae Görtz and Schmidt 2006

Assigned by: 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.

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Record number: 517251