Name: Hyphomicrobiales Douglas 1957 (Approved Lists 1980)

Category: Order

Proposed as: ord. nov.

Etymology: Hy.pho.mi.cro.bi.a’les. N.L. neut. n. Hyphomicrobium, type genus of the order; L. fem. pl. n. suff. -ales, ending to denote an order; N.L. fem. pl. n. Hyphomicrobiales, the Hyphomicrobium order

Pronunciation (Latin), gender: hy-p^ho-mi-kro-bi-A-les, feminine

Type genus: Hyphomicrobium Stutzer and Hartleb 1899 (Approved Lists 1980)

Effective publication: Douglas HC. Order III. Hyphomicrobiales Douglas, Ordo Nov. In: Breed RS, Murray EGD, Smith NR (eds), Bergey’s Manual of Determinative Bacteriology, 7th ed., The Williams and Wilkins Co., Baltimore, 1957, p. 276-280.

IJSEM list: Skerman VBD, McGowan V, Sneath PHA. Approved lists of bacterial names. Int J Syst Bacteriol 1980; 30:225-420.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

• Synonyms:

  • Name	Kind
    Parvibaculales Chuvochina et al. 2024	heterotypic synonym, validly published under the ICNP
    Rhizobiales Kuykendall 2006	heterotypic synonym, validly published under the ICNP, illegitimate name

• Emendations:
  • Hördt et al. 2020 Hordt A, Lopez MG, Meier-Kolthoff JP, Schleuning M, Weinhold LM, Tindall BJ, Gronow S, Kyrpides NC, Woyke T, Goker M. Analysis of 1,000+ Type-Strain Genomes Substantially Improves Taxonomic Classification of Alphaproteobacteria. Front Microbiol 2020; 11:468. 🇩🇪 Oren A, Garrity GM. List of changes in taxonomic opinion no. 32. Notification of changes in taxonomic opinion previously published outside the IJSEM. Int J Syst Evol Microbiol 2020; 70:4061-4090.
    Notes:
    • ⊕ Emendation accompanied by the inclusion of 2 genera in the order. — ⊕ Emendation accompanied by the inclusion of 39 families in the order.
    • ⊖ Emendation accompanied by the removal of 1 genus from the order.
    • 🧍 In the publication by Hördt et al. (2020) the authority was incorrectly given as "Douglas et al. 1957".

• Notes:
  • 🧕 Breed et al. (1957) assigned this order to the class Schizomycetes Nägeli 1857 (Approved Lists 1980). Publication: Parker CD. Genus V. Thiobacillus Beijerinck 1904. In: Breed RS, Murray EGD, Smith NR (eds), Bergey's Manual of Determinative Bacteriology, 7th edition, The Williams & Wilkins Co, Baltimore, 1957, p. 83-88.
  • 🧒 Breed et al. (1957) assigned the family Pasteuriaceae Laurent 1890 (Approved Lists 1980) to this order. Publication: Parker CD. Genus V. Thiobacillus Beijerinck 1904. In: Breed RS, Murray EGD, Smith NR (eds), Bergey's Manual of Determinative Bacteriology, 7th edition, The Williams & Wilkins Co, Baltimore, 1957, p. 83-88.
  • 🧒 Douglas (1957) assigned the genus Hyphomicrobium Stutzer and Hartleb 1899 (Approved Lists 1980) to this order. Publication: Douglas HC. Order III. Hyphomicrobiales Douglas, Ordo Nov. In: Breed RS, Murray EGD, Smith NR (eds), Bergey’s Manual of Determinative Bacteriology, 7th ed., The Williams and Wilkins Co., Baltimore, 1957, p. 276-280.
  • 🧒 Freese et al. (2025) assigned the genus "Thermopetrobacter" Sislak 2013 to this order. Publication: 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. 🇩🇪
  • 🧒 Hördt et al. (2020) assigned the family Notoacmeibacteraceae Huang et al. 2017 to this order. Publication: Hordt A, Lopez MG, Meier-Kolthoff JP, Schleuning M, Weinhold LM, Tindall BJ, Gronow S, Kyrpides NC, Woyke T, Goker M. Analysis of 1,000+ Type-Strain Genomes Substantially Improves Taxonomic Classification of Alphaproteobacteria. Front Microbiol 2020; 11:468. 🇩🇪
  • 🧒 Hördt et al. (2020) assigned the family Amorphaceae Hördt et al. 2020 to this order. Publication: Hordt A, Lopez MG, Meier-Kolthoff JP, Schleuning M, Weinhold LM, Tindall BJ, Gronow S, Kyrpides NC, Woyke T, Goker M. Analysis of 1,000+ Type-Strain Genomes Substantially Improves Taxonomic Classification of Alphaproteobacteria. Front Microbiol 2020; 11:468. 🇩🇪
  • 🧒 Hördt et al. (2020) assigned the family Boseaceae Hördt et al. 2020 to this order. Publication: Hordt A, Lopez MG, Meier-Kolthoff JP, Schleuning M, Weinhold LM, Tindall BJ, Gronow S, Kyrpides NC, Woyke T, Goker M. Analysis of 1,000+ Type-Strain Genomes Substantially Improves Taxonomic Classification of Alphaproteobacteria. Front Microbiol 2020; 11:468. 🇩🇪
  • 🧒 Hördt et al. (2020) assigned the family Breoghaniaceae Hördt et al. 2020 to this order. Publication: Hordt A, Lopez MG, Meier-Kolthoff JP, Schleuning M, Weinhold LM, Tindall BJ, Gronow S, Kyrpides NC, Woyke T, Goker M. Analysis of 1,000+ Type-Strain Genomes Substantially Improves Taxonomic Classification of Alphaproteobacteria. Front Microbiol 2020; 11:468. 🇩🇪
  • 🧒 Hördt et al. (2020) assigned the family Pseudoxanthobacteraceae Hördt et al. 2020 to this order. Publication: Hordt A, Lopez MG, Meier-Kolthoff JP, Schleuning M, Weinhold LM, Tindall BJ, Gronow S, Kyrpides NC, Woyke T, Goker M. Analysis of 1,000+ Type-Strain Genomes Substantially Improves Taxonomic Classification of Alphaproteobacteria. Front Microbiol 2020; 11:468. 🇩🇪
  • 🧒 Hördt et al. (2020) assigned the family Brucellaceae Breed et al. 1957 (Approved Lists 1980) to this order. Publication: Hordt A, Lopez MG, Meier-Kolthoff JP, Schleuning M, Weinhold LM, Tindall BJ, Gronow S, Kyrpides NC, Woyke T, Goker M. Analysis of 1,000+ Type-Strain Genomes Substantially Improves Taxonomic Classification of Alphaproteobacteria. Front Microbiol 2020; 11:468. 🇩🇪
  • 🧒 Hördt et al. (2020) assigned the family Phyllobacteriaceae Mergaert and Swings 2006 to this order. Publication: Hordt A, Lopez MG, Meier-Kolthoff JP, Schleuning M, Weinhold LM, Tindall BJ, Gronow S, Kyrpides NC, Woyke T, Goker M. Analysis of 1,000+ Type-Strain Genomes Substantially Improves Taxonomic Classification of Alphaproteobacteria. Front Microbiol 2020; 11:468. 🇩🇪
  • 🧒 Rosario-Passapera et al. (2012) assigned the genus "Phyllobacter" to this order. Publication: Rosario-Passapera R, Keddis R, Wong R, Lutz RA, Starovoytov V, Vetriani C. Parvibaculum hydrocarboniclasticum sp. nov., a mesophilic, alkane-oxidizing alphaproteobacterium isolated from a deep-sea hydrothermal vent on the East Pacific Rise. Int J Syst Evol Microbiol 2012; 62:2921-2926. 🇺🇸
  • 🙄 This taxon name is occasionally misprinted (or affected by an OCR error) in some sources as: "Hypbomicrobiales".
  • 🧔 This taxon was discussed in a meeting of a Taxonomic Subcommittee of the ICSP. Publication: Mousavi SA, Young JPW. International Committee on Systematics of Prokaryotes Subcommittee on the taxonomy of Rhizobia and Agrobacteria: minutes of the 2024 closed annual meeting. Int J Syst Evol Microbiol 2025; 75:6680. 🇫🇮
  • 💁 Taxonomists who have recently focused on this group are the corresponding authors of Dedysh et al. (2016). Editors in search of reviewers are advised to consider additional criteria such as whether a taxon is covered by one of the ICSP subcommittees.
  • 🎰 The BRCs most frequently used for deposits in this group are: DSM: 772; LMG: 536; JCM: 373; KCTC: 357; ATCC: 314; NBRC: 279; HAMBI: 204; CIP: 202; CGMCC: 145; CCUG: 138.

Subdivision:

Number of child taxa with a validly published and correct name: 40
Number of child taxa with a validly published name, including synonyms: 52
Total number of child taxa: 63

• Child taxa:

  • Name	Nomenclatural status	Taxonomic status
    Acuticoccaceae Lai et al. 2019	validly published under the ICNP	correct name
    Aestuariivirgaceae Li et al. 2019	validly published under the ICNP	correct name
    Afifellaceae Hördt et al. 2020	validly published under the ICNP	correct name
    Ahrensiaceae Hördt et al. 2020	validly published under the ICNP	correct name
    Alloboseaceae Deshmukh and Oren 2026	validly published under the ICNP	correct name
    Alsobacteraceae Sun et al. 2018	validly published under the ICNP	correct name
    Amorphaceae Hördt et al. 2020	validly published under the ICNP, illegitimate name	synonym
    Ancalomicrobiaceae Dahal et al. 2018	validly published under the ICNP	correct name
    Aurantimonadaceae Hördt et al. 2020	validly published under the ICNP	correct name
    "Aurantimonadaceae" Garrity et al. 2003	not validly published	synonym
    Bartonellaceae Gieszczykiewicz 1939 (Approved Lists 1980)	validly published under the ICNP	correct name
    Beijerinckiaceae Garrity et al. 2006	validly published under the ICNP	correct name
    Blastochloridaceae Hördt et al. 2020	validly published under the ICNP	correct name
    Boseaceae Hördt et al. 2020	validly published under the ICNP, illegitimate name	synonym
    Bradyrhizobiaceae Garrity et al. 2006	validly published under the ICNP, illegitimate name	synonym
    Breoghaniaceae Hördt et al. 2020	validly published under the ICNP	synonym
    Brucellaceae Breed et al. 1957 (Approved Lists 1980)	validly published under the ICNP	synonym
    Chelatococcaceae Dedysh et al. 2016	validly published under the ICNP	correct name
    Cohaesibacteraceae Hwang and Cho 2008	validly published under the ICNP	correct name
    Coralliovaceae Li et al. 2024	validly published under the ICNP	correct name
    Devosiaceae Hördt et al. 2020	validly published under the ICNP	correct name
    Hyphomicrobiaceae Babudieri 1950 (Approved Lists 1980)	validly published under the ICNP	correct name
    [Hyphomicrobiales, not assigned to family]	artificial parent node of taxa incertae sedis
    Kaistiaceae Hördt et al. 2020	validly published under the ICNP	correct name
    "Labraceae" Harkes et al. 2020	inaccurate spelling	misspelling
    "Labryaceae" corrig. Harkes et al. 2020	not validly published	synonym
    Lichenibacteriaceae Pankratov et al. 2020	validly published under the ICNP	correct name
    Lichenihabitantaceae Noh et al. 2019	validly published under the ICNP	correct name
    Mabikibacteraceae Choi et al. 2017	validly published under the ICNP	synonym
    "Metabolovariaceae" Li et al. 2026	not validly published	preferred name
    "Metallogeniaceae" Zavarzin 1961	not validly published	preferred name
    Methylobacteriaceae Garrity et al. 2006	validly published under the ICNP	correct name
    Methylocystaceae Bowman 2006	validly published under the ICNP	correct name
    Methyloligellaceae Chuvochina et al. 2024	validly published under the ICNP	synonym
    Methylopilaceae diCenzo et al. 2024	validly published under the ICNP	correct name
    Nitrobacteraceae corrig. Buchanan 1917 (Approved Lists 1980)	validly published under the ICNP	correct name
    Nitrobacteriaceae Buchanan 1917 (Approved Lists 1980)	inaccurate spelling	misspelling
    Notoacmeibacteraceae Huang et al. 2017	validly published under the ICNP	synonym
    Parvibaculaceae Hördt et al. 2020	validly published under the ICNP	correct name
    "Candidatus Phaeomarinibacteraceae" corrig. Dittami et al. 2014	not validly published	synonym
    "Candidatus Phaeomarinobacteraceae" Dittami et al. 2014	inaccurate spelling	misspelling
    Phreatobacteraceae Hördt et al. 2020	validly published under the ICNP	correct name
    Phyllobacteriaceae Mergaert and Swings 2006	validly published under the ICNP	synonym
    Pleomorphomonadaceae Hördt et al. 2020	validly published under the ICNP	correct name
    "Propylenellaceae" Liu et al. 2021	not validly published	preferred name
    Pseudoxanthobacteraceae Hördt et al. 2020	validly published under the ICNP	synonym
    Rhabdaerophilaceae Ming et al. 2020	validly published under the ICNP	correct name
    Rhizobiaceae Conn 1938 (Approved Lists 1980)	validly published under the ICNP	correct name
    Rhodobiaceae Garrity et al. 2006	validly published under the ICNP	correct name
    Rhodoblastaceae Guo et al. 2024	validly published under the ICNP, illegitimate name	synonym
    Rhodoblastaceae diCenzo et al. 2024	validly published under the ICNP	correct name
    Rhodoligotrophaceae diCenzo et al. 2024	validly published under the ICNP	correct name
    Rhodomicrobiaceae Chuvochina et al. 2024	validly published under the ICNP	synonym
    Roseiarcaceae Kulichevskaya et al. 2014	validly published under the ICNP	correct name
    Salaquimonadaceae diCenzo et al. 2024	validly published under the ICNP	correct name
    Salinarimonadaceae Cole et al. 2018	validly published under the ICNP	correct name
    Sanyastnellaceae Li et al. 2024	validly published under the ICNP	correct name
    Segnochrobactraceae Akter et al. 2020	validly published under the ICNP	correct name
    Stappiaceae Hördt et al. 2020	validly published under the ICNP	correct name
    Tepidamorphaceae Hördt et al. 2020	validly published under the ICNP	correct name
    Terrirubraceae Guo et al. 2024	validly published under the ICNP	correct name
    "Thermopetrobacteraceae" Laroche et al. 2022	not validly published	preferred name
    Xanthobacteraceae Lee et al. 2005	validly published under the ICNP	correct name

Parent taxon: Alphaproteobacteria Garrity et al. 2006

Assigned by: Hordt A, Lopez MG, Meier-Kolthoff JP, Schleuning M, Weinhold LM, Tindall BJ, Gronow S, Kyrpides NC, Woyke T, Goker M. Analysis of 1,000+ Type-Strain Genomes Substantially Improves Taxonomic Classification of Alphaproteobacteria. Front Microbiol 2020; 11:468. 🇩🇪

Linking: To permanently link to this page, use https://doi.org/10.83108/rn.5020Copy to clipboardLink copied to clipboard

Record number: 5020