Name: Pseudomonadaceae Winslow et al. 1917 (Approved Lists 1980)

Category: Family

Proposed as: fam. nov.

Etymology: Pseu.do.mo.na.da’ce.ae. N.L. fem. n. Pseudomonas, type genus of the family; L. fem. pl. n. suff. -aceae, ending to denote a family; N.L. fem. pl. n. Pseudomonadaceae, the Pseudomonas family

Pronunciation (Latin), gender: pse͡u-do-mo-na-DA-ke-a͡e, feminine

Type genus: Pseudomonas Migula 1894 (Approved Lists 1980)

Effective publication: Winslow CE, Broadhurst J, Buchanan RE, Krumwiede C, Rogers LA, Smith GH. The Families and Genera of the Bacteria: Preliminary Report of the Committee of the Society of American Bacteriologists on Characterization and Classification of Bacterial Types. J Bacteriol 1917; 2:505-566.

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
    Permianibacteraceae Flores-Félix et al. 2026	heterotypic synonym, validly published under the ICNP

• Emendations:
  • Flores-Félix et al. 2025 Flores-Felix JD, Garcia-Fraile P, Saati-Santamaria Z. Harmony in diversity: Reorganizing the families within the order Pseudomonadales. Mol Phylogenet Evol 2025; 0:108321. 🇪🇸 Oren A, Göker M. List of changes in taxonomic opinion no. 42. Notification of changes in taxonomic opinion previously published outside the IJSEM. Int J Syst Evol Microbiol 2025; 75:6793.
    Notes:
    • ⊕ Emendation accompanied by the inclusion of 8 genera in the family.
    • ⊖ Emendation accompanied by the removal of 3 genera from the family.

• Notes:
  • 🧕 Breed et al. (1948) assigned this family to the suborder Eubacteriineae Breed et al. 1944 (Approved Lists 1980). Publication: Burkholder WH. Genus I. Pseudomonas Migula. Bacterial plant pathogens. In: Breed RS, Murray EGD, Hitchens AP (eds), Bergey's Manual of Determinative Bacteriology, 6th ed., The Williams & Wilkins Co, Baltimore, 1948, p. 82-150.
  • 🧕 Breed et al. (1957) assigned this family to the suborder Pseudomonadineae Breed et al. 1957 (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.
  • 🧕 Cavalier-Smith (2002) assigned this family to the class "Chromatibacteria" Cavalier-Smith 2002. Publication: Cavalier-Smith T. The neomuran origin of archaebacteria, the negibacterial root of the universal tree and bacterial megaclassification. Int J Syst Evol Microbiol 2002; 52:7-76. 🇬🇧
  • 🧕 Winslow et al. (1920) assigned this family to the order Eubacteriales Buchanan 1917 (Approved Lists 1980). Publication: Winslow CE, Broadhurst J, Buchanan RE, Krumwiede C, Rogers LA, Smith GH. The Families and Genera of the Bacteria: Final Report of the Committee of the Society of American Bacteriologists on Characterization and Classification of Bacterial Types. J Bacteriol 1920; 5:191-229.
  • 🧒 Boone et al. (2001) assigned the genus Thermoleophilum Zarilla and Perry 1986 to this family. Publication: Garrity GM, Holt JG. The Road Map to the Manual. In: Boone DR, Castenholz RW, Garrity GM (eds), Bergey's Manual of Systematic Bacteriology, second edition, vol. 1 (The Archaea and the deeply branching and phototrophic Bacteria), Springer-Verlag, New York, 2001, p. 119-166. 🇺🇸
  • 🧒 Boone et al. (2001) assigned the genus Oligella Rossau et al. 1987 to this family. Publication: Garrity GM, Holt JG. The Road Map to the Manual. In: Boone DR, Castenholz RW, Garrity GM (eds), Bergey's Manual of Systematic Bacteriology, second edition, vol. 1 (The Archaea and the deeply branching and phototrophic Bacteria), Springer-Verlag, New York, 2001, p. 119-166. 🇺🇸
  • 🧒 Boone et al. (2001) assigned the genus Lampropedia Schroeter 1886 (Approved Lists 1980) to this family. Publication: Garrity GM, Holt JG. The Road Map to the Manual. In: Boone DR, Castenholz RW, Garrity GM (eds), Bergey's Manual of Systematic Bacteriology, second edition, vol. 1 (The Archaea and the deeply branching and phototrophic Bacteria), Springer-Verlag, New York, 2001, p. 119-166. 🇺🇸
  • 🧒 Boone et al. (2001) assigned the genus Xylophilus Willems et al. 1987 to this family. Publication: Garrity GM, Holt JG. The Road Map to the Manual. In: Boone DR, Castenholz RW, Garrity GM (eds), Bergey's Manual of Systematic Bacteriology, second edition, vol. 1 (The Archaea and the deeply branching and phototrophic Bacteria), Springer-Verlag, New York, 2001, p. 119-166. 🇺🇸
  • 🧒 Boone et al. (2001) assigned the genus Morococcus Long et al. 1981 to this family. Publication: Garrity GM, Holt JG. The Road Map to the Manual. In: Boone DR, Castenholz RW, Garrity GM (eds), Bergey's Manual of Systematic Bacteriology, second edition, vol. 1 (The Archaea and the deeply branching and phototrophic Bacteria), Springer-Verlag, New York, 2001, p. 119-166. 🇺🇸
  • 🧒 Boone et al. (2001) assigned the genus Cellvibrio (ex Winogradsky 1929) Blackall et al. 1986 to this family. Publication: Garrity GM, Holt JG. The Road Map to the Manual. In: Boone DR, Castenholz RW, Garrity GM (eds), Bergey's Manual of Systematic Bacteriology, second edition, vol. 1 (The Archaea and the deeply branching and phototrophic Bacteria), Springer-Verlag, New York, 2001, p. 119-166. 🇺🇸
  • 🧒 Breed et al. (1948) assigned the tribe Pseudomonadeae Kluyver and Van Niel 1936 (Approved Lists 1980) to this family. Publication: Burkholder WH. Genus I. Pseudomonas Migula. Bacterial plant pathogens. In: Breed RS, Murray EGD, Hitchens AP (eds), Bergey's Manual of Determinative Bacteriology, 6th ed., The Williams & Wilkins Co, Baltimore, 1948, p. 82-150.
  • 🧒 Breed et al. (1948) assigned the tribe Spirilleae Kluyver and van Niel 1936 (Approved Lists 1980) to this family. Publication: Burkholder WH. Genus I. Pseudomonas Migula. Bacterial plant pathogens. In: Breed RS, Murray EGD, Hitchens AP (eds), Bergey's Manual of Determinative Bacteriology, 6th ed., The Williams & Wilkins Co, Baltimore, 1948, p. 82-150.
  • 🧒 Breed et al. (1957) assigned the genus Mycoplana Gray and Thornton 1928 (Approved Lists 1980) to this family. 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 genus Acetobacter Beijerinck 1898 (Approved Lists 1980) to this family. 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 genus Zymomonas Kluyver and van Niel 1936 (Approved Lists 1980) to this family. 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 genus Zoogloea Itzigsohn 1868 (Approved Lists 1980) to this family. 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 genus Aeromonas Stanier 1943 (Approved Lists 1980) to this family. 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 genus Photobacterium Beijerinck 1889 (Approved Lists 1980) to this family. 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 genus Xanthomonas Dowson 1939 (Approved Lists 1980) to this family. 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 genus Halobacterium Elazari-Volcani 1957 (Approved Lists 1980) to this family. Publication: Elazari-Volcani B. Genus XII. Halobacterium Elazari-Volcani, 1940. In: Breed RS, Murray EGD, Smith NR (eds), Bergey's Manual of Determinative Bacteriology, 7th edition, The Williams & Wilkins Co., Baltimore, 1957, p. 207-212.
  • 🧒 Brenner et al. (2005) assigned the genus Azotobacter Beijerinck 1901 (Approved Lists 1980) to this family. Publication: Garrity GM, Bell JA, Lilburn T. Class III. Gammaproteobacteria class. 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. 1. 🇺🇸
  • 🧒 Brenner et al. (2005) assigned the genus Rugamonas Austin and Moss 1987 to this family. Publication: Garrity GM, Bell JA, Lilburn T. Class III. Gammaproteobacteria class. 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. 1. 🇺🇸
  • 🧒 Flores-Felix et al. (2025) assigned the genus Azotobacter Beijerinck 1901 (Approved Lists 1980) to this family. Publication: Flores-Felix JD, Garcia-Fraile P, Saati-Santamaria Z. Harmony in diversity: Reorganizing the families within the order Pseudomonadales. Mol Phylogenet Evol 2025; 0:108321. 🇪🇸
  • 🧒 Kluyver and Van Niel (1936) assigned the tribe "Vibrioneae" to this family. Publication: Kluyver AJ, Van Niel CB. Prospects for a natural system of classification of bacteria. Zentralblatt für Bakteriologie, Parasitenkunde, Infektionskrankheiten und Hygiene, Abteilung II 1936; 94:369-403.
  • 🧒 Leifson (1954) assigned the genus "Acetomonas" Leifson 1954 to this family. Publication: Leifson E. The flagellation and taxonomy of species of Acetobacter. Antonie Van Leeuwenhoek 1954; 20:102-110.
  • 🧒 Smith (1963) assigned the genus "Necromonas" Smith 1963 to this family. Publication: Smith IW. THE CLASSIFICATION OF 'BACTERIUM SALMONICIDA'. J Gen Microbiol 1963; 33:263-274.
  • 🚃 The type genus of this family has alternatively been placed in the family "Bacteriaceae". Publication: Clements FE. The genera of fungi. The H.W. Wilson Company, Minneapolis, 1909.
  • 🙄 This taxon name is occasionally misprinted (or affected by an OCR error) in some sources as: "Paeudomonadaceae"; "Psedudomonadaceae"; "Psemlomonadaceae"; "Psetidomonadaceae"; "Pseudoinonadaceae"; "Pseudomondaceae"; "Pseudomooadaceae".
  • 🧔 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 annual meeting by videoconference, 5 July 2021, followed by online discussion until 31 December 2021. Int J Syst Evol Microbiol 2022; 72:5453. 🇫🇮
  • 💁 Taxonomists who have recently focused on this group are the corresponding authors of Holmes et al. (1987), Flores-Felix et al. (2025). 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: 387; LMG: 384; JCM: 241; CCUG: 196; ATCC: 183; CIP: 162; CFBP: 154; CECT: 100; NBRC: 100; KCTC: 74.

Subdivision:

Number of child taxa with a validly published and correct name: 13
Number of child taxa with a validly published name, including synonyms: 25
Total number of child taxa: 38

• Child taxa:

  • Name	Nomenclatural status	Taxonomic status
    "Alginomonas" Thjotta and Kass 1945	not validly published	preferred name
    "Alginovibrio" Thjotta and Kass 1945	not validly published	preferred name
    Aquipseudomonas Rudra and Gupta 2024	validly published under the ICNP	synonym
    Atopomonas Rudra and Gupta 2021	validly published under the ICNP	correct name
    Azomonas Winogradsky 1938 (Approved Lists 1980)	validly published under the ICNP	correct name
    Azomonotrichon Thompson and Skerman 1981	validly published under the ICNP	synonym
    Azorhizophilus Thompson and Skerman 1981	validly published under the ICNP	correct name
    "Azotomonas" Orla-Jensen 1909	not validly published	preferred name
    "Caenipseudomonas" Rudra and Gupta 2024	not validly published	synonym
    "Chlorobacter" Patel and Kulkarni 1951	not validly published	preferred name
    Chryseomonas Holmes et al. 1986	validly published under the ICNP	synonym
    Denitrificimonas Saati-Santamaría et al. 2021	validly published under the ICNP	correct name
    Ectopseudomonas Rudra and Gupta 2024	validly published under the ICNP	synonym
    Entomomonas Wang et al. 2020	validly published under the ICNP	correct name
    Flavimonas Holmes et al. 1987	validly published under the ICNP	synonym
    Geopseudomonas Rudra and Gupta 2024	validly published under the ICNP	synonym
    "Halobacter" Anderson 1954	not validly published	synonym
    Halopseudomonas Rudra and Gupta 2021	validly published under the ICNP	correct name
    Mesophilobacter Nishimura et al. 1989	validly published under the ICNP	correct name
    Metapseudomonas Rudra and Gupta 2024	validly published under the ICNP	synonym
    Neopseudomonas Saati-Santamaría et al. 2021	validly published under the ICNP, illegitimate name	synonym
    "Oblitimonas" Lauer et al. 2015	not validly published	synonym
    Oblitimonas Drobish et al. 2016	validly published under the ICNP	synonym
    Parapseudomonas Saati-Santamaría et al. 2021	validly published under the ICNP, illegitimate name	synonym
    Permianibacter Wang et al. 2014	validly published under the ICNP	correct name
    "Phytobacterium" Magrou and Prévot 1948	not validly published	preferred name
    Phytopseudomonas Rudra and Gupta 2024	validly published under the ICNP	synonym
    "Prashechia" Krznaric-Sucic and Weisglass 1979	not validly published	preferred name
    "Protaminobacter" Den Dooren-De Jong 1926	not validly published	preferred name
    Pseudomonas Migula 1894 (Approved Lists 1980)	validly published under the ICNP, conserved name	correct name
    Rhizobacter Goto and Kuwata 1988	validly published under the ICNP	correct name
    "Saccharomonas" Shimwell 1950	not validly published	preferred name
    Serpens Hespell 1977 (Approved Lists 1980)	validly published under the ICNP	correct name
    "Sporovibrio" Starkey 1938	not validly published	preferred name
    Stutzerimonas Lalucat et al. 2022	validly published under the ICNP	correct name
    Thiopseudomonas Tan et al. 2015	validly published under the ICNP	correct name
    "Whitmorella" Brygoo 1957	not validly published	preferred name
    Zestomonas Rudra and Gupta 2024	validly published under the ICNP	synonym

Parent taxon: Pseudomonadales Orla-Jensen 1921 (Approved Lists 1980)

Assigned by: Flores-Felix JD, Garcia-Fraile P, Saati-Santamaria Z. Harmony in diversity: Reorganizing the families within the order Pseudomonadales. Mol Phylogenet Evol 2025; 0:108321. 🇪🇸

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Record number: 1134