Name: Holosporaceae Görtz and Schmidt 2006

Category: Family

Proposed as: fam. nov.

Etymology: Ho.lo.spo.ra’ce.ae. N.L. fem. n. Holospora, type genus of the family; L. fem. pl. n. suff. -aceae, ending to denote a family; N.L. fem. pl. n. Holosporaceae, the Holospora family

Pronunciation, gender: ho-lo-spo-RA-ke-a͡e, feminine

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

Effective 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.

IJSEM list: Euzeby JP. Validation list no. 107. List of new names and new combinations previously effectively, but not validly, published. Int J Syst Evol Microbiol 2006; 56:1-6.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

• Synonyms:

  • Name	Kind
    "Candidatus Hepatobacteraceae" Chuvochina et al. 2023	heterotypic synonym, not pro-validly published

• Emendations:
  • Szokoli et al. 2016 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.
    Notes:
    • ⊕ Emendation accompanied by the inclusion of 5 genera in the family.
    • ⊖ Emendation accompanied by the removal of 1 genus from the family.
    • 🧍 As of 2020-09-22 this emendation was not yet included in an IJSEM List of Changes in Taxonomic Opinion.

• Notes:
  • 🧕 Brenner et al. (2005) assigned this family to the order Rickettsiales Gieszczykiewicz 1939 (Approved Lists 1980). 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.
  • 🧕 Castelli and Petroni (2025) assigned this family 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 family to the class Alphaproteobacteria Garrity et al. 2006. 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.
  • 🧒 Boscaro et al. (2013) assigned the genus "Candidatus Gortzia" Boscaro et al. 2013 to this family. Publication: Boscaro V, Fokin SI, Schrallhammer M, Schweikert M, Petroni G. Revised systematics of Holospora-like bacteria and characterization of "Candidatus Gortzia infectiva", a novel macronuclear symbiont of Paramecium jenningsi. Microb Ecol 2013; 65:255-267.
  • 🧒 Brenner et al. (2005) assigned the genus "Candidatus Paracaedibacter" Horn et al. 1999 to this family. 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.
  • 🧒 Brenner et al. (2005) assigned the genus "Candidatus Odyssella" Birtles et al. 2000 to this family. 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.
  • 🧒 Brenner et al. (2005) assigned the genus Lyticum (ex Preer et al. 1974) Preer and Preer 1982 to this family. 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.
  • 🧒 Brenner et al. (2005) assigned the genus Caedibacter (ex Preer et al. 1974) Preer and Preer 1982 to this family. 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.
  • 🧒 Brenner et al. (2005) assigned the genus "Pseudolyticum" Boss et al. 1987 to this family. 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.
  • 🧒 Brenner et al. (2005) assigned the genus "Caedimonas" to this family. 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.
  • 🧒 Szokoli et al. (2016) assigned the genus "Candidatus Gortzia" Boscaro et al. 2013 to this family. 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 BRCs most frequently used for deposits in this group are: ATCC: 6.

Subdivision:

Number of child taxa with a validly published and correct name: 3
Number of child taxa with a validly published name, including synonyms: 4
Total number of child taxa: 19

• Child taxa:

  • Name	Nomenclatural status	Taxonomic status
    "Candidatus Bealeia" Szokoli et al. 2016	not validly published	pro-correct name
    "Candidatus Cytomitobacter" Tashyreva et al. 2018	not validly published	pro-correct name
    "Candidatus Fujishimia" Boscaro et al. 2019	not validly published	pro-correct name
    "Candidatus Goertzia" corrig. Boscaro et al. 2013	not validly published	pro-correct name
    "Candidatus Gortzia" Boscaro et al. 2013	inaccurate spelling	misspelling
    "Candidatus Gromoviella" Castelli et al. 2022	not validly published	preferred name
    "Candidatus Hafkinia" Fokin et al. 2019	not validly published	pro-correct name
    "Candidatus Hepatobacter" Nunan et al. 2013	not validly published	pro-correct name
    "Candidatus Hepatobacter" Chuvochina et al. 2023	not validly published	synonym
    Holospora (ex Hafkine 1890) Gromov and Ossipov 1981	validly published under the ICNP	correct name
    Holospora (ex Hafkine 1890) Preer and Preer 1982	validly published under the ICNP, illegitimate name, later homonym	not in use
    "Candidatus Hydrogenosomobacter" Takeshita et al. 2019	not validly published	pro-correct name
    "Candidatus Ignotibacter" corrig. George et al. 2020	not validly published	pro-correct name
    "Candidatus Mystax" Korotaev et al. 2020	not validly published	preferred name
    "Candidatus Nesciobacter" George et al. 2020	inaccurate spelling	misspelling
    "Candidatus Paraholospora" Eschbach et al. 2009	not validly published	pro-correct name
    "Preeria" Potekhin et al. 2018	not validly published	synonym
    Pseudocaedibacter Quackenbush 1982	validly published under the ICNP	correct name
    Tectibacter (ex Preer et al. 1974) Preer and Preer 1982	validly published under the ICNP	correct name

Parent taxon: Holosporales Szokoli et al. 2020

Assigned by: 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.

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Record number: 653