Name: Pseudomonadales Orla-Jensen 1921 (Approved Lists 1980)

Category: Order

Proposed as: ord. nov.

Etymology: N.L. fem. n. Pseudomonas, type genus of the order; L. fem. pl. n. suff. -ales, ending to denote an order; N.L. fem. pl. n. Pseudomonadales, the Pseudomonas order

Gender: feminine

Type genus: Pseudomonas Migula 1894 (Approved Lists 1980)

Effective publication: Orla-Jensen S. The Main Lines of the Natural Bacterial System. J Bacteriol 1921; 6:263-273.

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
    Moraxellales Liao et al. 2021	heterotypic synonym, validly published under the ICNP

• Emendations:
  • Liao et al. 2020 Liao H, Lin X, Li Y, Qu M, Tian Y. Reclassification of the Taxonomic Framework of Orders Cellvibrionales, Oceanospirillales, Pseudomonadales, and Alteromonadales in Class Gammaproteobacteria through Phylogenomic Tree Analysis. mSystems 2020; 5:e00543-20. Oren A, Garrity GM. List of changes in taxonomic opinion no. 33. Notification of changes in taxonomic opinion previously published outside the IJSEM. Int J Syst Evol Microbiol 2021; 71:2-3.
    Notes:
    • ⊕ Emendation accompanied by the inclusion of 16 families in the order.
    • ⊖ Emendation accompanied by the removal of 1 family from the order.
  • Flores-Felix 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.
    Notes:
    • ⊕ Emendation accompanied by the inclusion of 1 genus in the order. — ⊕ Emendation accompanied by the inclusion of 20 families in the order.
    • 🧍 As of 2025-03-18 this emendation was not yet included in an IJSEM List of Changes in Taxonomic Opinion.

• Notes:
  • 🥇 Nomenclatural type of the phylum "Proteobacteria" Garrity et al. 2005. Publication: Garrity GM, Bell JA, Lilburn T. Phylum XIV. Proteobacteria phyl. 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.
  • 🧕 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 "Thiobacteriaceae" Orla-Jensen 1909 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.
  • 🧒 Breed et al. (1957) assigned the family "Thiorhodaceae" Molisch 1907 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.
  • 🧒 Breed et al. (1957) assigned the suborder "Rhodobacteriineae" Breed et al. 1944 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.
  • 🧒 Brenner et al. (2005) assigned the genus Enhydrobacter Staley et al. 1987 to this order. 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 family Endozoicomonadaceae Bartz et al. 2018 to this order. 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.
  • 🧒 Flores-Felix et al. (2025) assigned the family Natronospirillaceae Kevbrin et al. 2020 to this order. 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.
  • 🧒 Flores-Felix et al. (2025) assigned the family Halomonadaceae Franzmann et al. 1989 to this order. 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.
  • 🧒 Flores-Felix et al. (2025) assigned the family Alcanivoracaceae corrig. Golyshin et al. 2005 to this order. 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.
  • 🧒 Flores-Felix et al. (2025) assigned the family Oceanospirillaceae Garrity et al. 2005 to this order. 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.
  • 🧒 Flores-Felix et al. (2025) assigned the family Cellvibrionaceae Spring et al. 2015 to this order. 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.
  • 🧒 Flores-Felix et al. (2025) assigned the family Halieaceae Spring et al. 2015 to this order. 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.
  • 🧒 Flores-Felix et al. (2025) assigned the family Spongiibacteraceae Spring et al. 2015 to this order. 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.
  • 🧒 Flores-Felix et al. (2025) assigned the family Kangiellaceae Wang et al. 2015 to this order. 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.
  • 🧒 Flores-Felix et al. (2025) assigned the family "Oceanobacteraceae" Flores-Felix et al. 2025 to this order. 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.
  • 🧒 Flores-Felix et al. (2025) assigned the family "Litoribrevibacteraceae" Flores-Felix et al. 2025 to this order. 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.
  • 🧒 Flores-Felix et al. (2025) assigned the family "Pelagibaculaceae" Flores-Felix et al. 2025 to this order. 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.
  • 🧒 Flores-Felix et al. (2025) assigned the family "Permianibacteraceae" Flores-Felix et al. 2025 to this order. 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.
  • 🧒 Flores-Felix et al. (2025) assigned the family "Dasaniaceae" Flores-Felix et al. 2025 to this order. 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.
  • 🧒 Flores-Felix et al. (2025) assigned the family "Nitrincolaceae" Flores-Felix et al. 2025 to this order. 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.
  • 🧒 Flores-Felix et al. (2025) assigned the family "Sinobacteriaceae" Flores-Felix et al. 2025 to this order. 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.
  • 🧒 Flores-Felix et al. (2025) assigned the family Balneatricaceae corrig. Krishnan et al. 2019 to this order. 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.
  • 🧒 Flores-Felix et al. (2025) assigned the family Litorivicinaceae Deshmukh and Oren 2023 to this order. 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.
  • 🧒 Flores-Felix et al. (2025) assigned the genus Sinobacter Zhou et al. 2008 to this order. 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.
  • 🧒 Liao et al. (2020) assigned the family Balneatrichaceae Krishnan et al. 2019 to this order. Publication: Liao H, Lin X, Li Y, Qu M, Tian Y. Reclassification of the Taxonomic Framework of Orders Cellvibrionales, Oceanospirillales, Pseudomonadales, and Alteromonadales in Class Gammaproteobacteria through Phylogenomic Tree Analysis. mSystems 2020; 5:e00543-20.
  • 🧒 Liao et al. (2020) assigned the family Perlucidibacaceae Liao et al. 2021 to this order. Publication: Liao H, Lin X, Li Y, Qu M, Tian Y. Reclassification of the Taxonomic Framework of Orders Cellvibrionales, Oceanospirillales, Pseudomonadales, and Alteromonadales in Class Gammaproteobacteria through Phylogenomic Tree Analysis. mSystems 2020; 5:e00543-20.
  • 🧒 Liao et al. (2020) assigned the family Natronospirillaceae Kevbrin et al. 2020 to this order. Publication: Liao H, Lin X, Li Y, Qu M, Tian Y. Reclassification of the Taxonomic Framework of Orders Cellvibrionales, Oceanospirillales, Pseudomonadales, and Alteromonadales in Class Gammaproteobacteria through Phylogenomic Tree Analysis. mSystems 2020; 5:e00543-20.
  • 🧒 Liao et al. (2020) assigned the family Saccharospirillaceae Kevbrin et al. 2020 to this order. Publication: Liao H, Lin X, Li Y, Qu M, Tian Y. Reclassification of the Taxonomic Framework of Orders Cellvibrionales, Oceanospirillales, Pseudomonadales, and Alteromonadales in Class Gammaproteobacteria through Phylogenomic Tree Analysis. mSystems 2020; 5:e00543-20.
  • 🧒 Liao et al. (2020) assigned the family Halomonadaceae Franzmann et al. 1989 to this order. Publication: Liao H, Lin X, Li Y, Qu M, Tian Y. Reclassification of the Taxonomic Framework of Orders Cellvibrionales, Oceanospirillales, Pseudomonadales, and Alteromonadales in Class Gammaproteobacteria through Phylogenomic Tree Analysis. mSystems 2020; 5:e00543-20.
  • 🧒 Liao et al. (2020) assigned the family Oleiphilaceae Golyshin et al. 2002 to this order. Publication: Liao H, Lin X, Li Y, Qu M, Tian Y. Reclassification of the Taxonomic Framework of Orders Cellvibrionales, Oceanospirillales, Pseudomonadales, and Alteromonadales in Class Gammaproteobacteria through Phylogenomic Tree Analysis. mSystems 2020; 5:e00543-20.
  • 🧒 Liao et al. (2020) assigned the family Alcanivoracaceae corrig. Golyshin et al. 2005 to this order. Publication: Liao H, Lin X, Li Y, Qu M, Tian Y. Reclassification of the Taxonomic Framework of Orders Cellvibrionales, Oceanospirillales, Pseudomonadales, and Alteromonadales in Class Gammaproteobacteria through Phylogenomic Tree Analysis. mSystems 2020; 5:e00543-20.
  • 🧒 Liao et al. (2020) assigned the family Hahellaceae Garrity et al. 2005 to this order. Publication: Liao H, Lin X, Li Y, Qu M, Tian Y. Reclassification of the Taxonomic Framework of Orders Cellvibrionales, Oceanospirillales, Pseudomonadales, and Alteromonadales in Class Gammaproteobacteria through Phylogenomic Tree Analysis. mSystems 2020; 5:e00543-20.
  • 🧒 Liao et al. (2020) assigned the family Oceanospirillaceae Garrity et al. 2005 to this order. Publication: Liao H, Lin X, Li Y, Qu M, Tian Y. Reclassification of the Taxonomic Framework of Orders Cellvibrionales, Oceanospirillales, Pseudomonadales, and Alteromonadales in Class Gammaproteobacteria through Phylogenomic Tree Analysis. mSystems 2020; 5:e00543-20.
  • 🧒 Liao et al. (2020) assigned the family Litoricolaceae Kim et al. 2007 to this order. Publication: Liao H, Lin X, Li Y, Qu M, Tian Y. Reclassification of the Taxonomic Framework of Orders Cellvibrionales, Oceanospirillales, Pseudomonadales, and Alteromonadales in Class Gammaproteobacteria through Phylogenomic Tree Analysis. mSystems 2020; 5:e00543-20.
  • 🧒 Liao et al. (2020) assigned the family Cellvibrionaceae Spring et al. 2015 to this order. Publication: Liao H, Lin X, Li Y, Qu M, Tian Y. Reclassification of the Taxonomic Framework of Orders Cellvibrionales, Oceanospirillales, Pseudomonadales, and Alteromonadales in Class Gammaproteobacteria through Phylogenomic Tree Analysis. mSystems 2020; 5:e00543-20.
  • 🧒 Liao et al. (2020) assigned the family Halieaceae Spring et al. 2015 to this order. Publication: Liao H, Lin X, Li Y, Qu M, Tian Y. Reclassification of the Taxonomic Framework of Orders Cellvibrionales, Oceanospirillales, Pseudomonadales, and Alteromonadales in Class Gammaproteobacteria through Phylogenomic Tree Analysis. mSystems 2020; 5:e00543-20.
  • 🧒 Liao et al. (2020) assigned the family Microbulbiferaceae Spring et al. 2015 to this order. Publication: Liao H, Lin X, Li Y, Qu M, Tian Y. Reclassification of the Taxonomic Framework of Orders Cellvibrionales, Oceanospirillales, Pseudomonadales, and Alteromonadales in Class Gammaproteobacteria through Phylogenomic Tree Analysis. mSystems 2020; 5:e00543-20.
  • 🧒 Liao et al. (2020) assigned the family Porticoccaceae Spring et al. 2015 to this order. Publication: Liao H, Lin X, Li Y, Qu M, Tian Y. Reclassification of the Taxonomic Framework of Orders Cellvibrionales, Oceanospirillales, Pseudomonadales, and Alteromonadales in Class Gammaproteobacteria through Phylogenomic Tree Analysis. mSystems 2020; 5:e00543-20.
  • 🧒 Liao et al. (2020) assigned the family Spongiibacteraceae Spring et al. 2015 to this order. Publication: Liao H, Lin X, Li Y, Qu M, Tian Y. Reclassification of the Taxonomic Framework of Orders Cellvibrionales, Oceanospirillales, Pseudomonadales, and Alteromonadales in Class Gammaproteobacteria through Phylogenomic Tree Analysis. mSystems 2020; 5:e00543-20.
  • 🧒 Liao et al. (2020) assigned the family Balneatricaceae corrig. Krishnan et al. 2019 to this order. Publication: Liao H, Lin X, Li Y, Qu M, Tian Y. Reclassification of the Taxonomic Framework of Orders Cellvibrionales, Oceanospirillales, Pseudomonadales, and Alteromonadales in Class Gammaproteobacteria through Phylogenomic Tree Analysis. mSystems 2020; 5:e00543-20.
  • 🧒 Orla-Jensen (1921) assigned the genus "Azotomonas" Orla-Jensen 1909 to this order. Publication: Orla-Jensen S. The Main Lines of the Natural Bacterial System. J Bacteriol 1921; 6:263-273.
  • 🧒 Orla-Jensen (1921) assigned the genus "Hydrogenomonas" Orla-Jensen 1909 to this order. Publication: Orla-Jensen S. The Main Lines of the Natural Bacterial System. J Bacteriol 1921; 6:263-273.
  • 🧒 Orla-Jensen (1921) assigned the genus "Methanomonas" Orla-Jensen 1909 to this order. Publication: Orla-Jensen S. The Main Lines of the Natural Bacterial System. J Bacteriol 1921; 6:263-273.
  • 🧒 Orla-Jensen (1921) assigned the genus Nitrosomonas Winogradsky 1892 (Approved Lists 1980) to this order. Publication: Orla-Jensen S. The Main Lines of the Natural Bacterial System. J Bacteriol 1921; 6:263-273.
  • 🧒 Orla-Jensen (1921) assigned the genus Pseudomonas Migula 1894 (Approved Lists 1980) to this order. Publication: Orla-Jensen S. The Main Lines of the Natural Bacterial System. J Bacteriol 1921; 6:263-273.
  • 🧒 Orla-Jensen (1921) assigned the genus "Acetimonas" to this order. — 🧒 Orla-Jensen (1921) assigned the genus "Carboxydomonas" to this order. — 🧒 Orla-Jensen (1921) assigned the genus "Fluormonas" to this order. — 🧒 Orla-Jensen (1921) assigned the genus "Photomonas" to this order. — 🧒 Orla-Jensen (1921) assigned the genus "Spiromonas" to this order. Publication: Orla-Jensen S. The Main Lines of the Natural Bacterial System. J Bacteriol 1921; 6:263-273.
  • 🧒 Orla-Jensen (1921) assigned the genus "Rhizomonas" to this order. Publication: Orla-Jensen S. The Main Lines of the Natural Bacterial System. J Bacteriol 1921; 6:263-273.
  • 🧒 Yilmaz et al. (2014) assigned the genus Dasania Lee et al. 2008 to this order. Publication: Yilmaz P, Parfrey LW, Yarza P, Gerken J, Pruesse E, Quast C, Schweer T, Peplies J, Ludwig W, Glöckner FO. The SILVA and “all-species living tree project (LTP)” taxonomic frameworks. Nucleic Acids Research 2014; 42(D1):D643-D648.
  • 🙄 This taxon name is occasionally misprinted (or affected by an OCR error) in some sources as: "Pseudcmonadales"; "Pseudomonaclales"; "Pseudomoniales"; "Pseudomouadales".
  • 🎰 The BRCs most frequently used for deposits in this group are: DSM: 497; JCM: 284; CCUG: 280; ATCC: 236; CIP: 218; CFBP: 154; NBRC: 116; KCTC: 114; CECT: 105; NCTC: 77.

Subdivision:

Number of child taxa with a validly published and correct name: 4
Number of child taxa with a validly published name, including synonyms: 7
Total number of child taxa: 13

• Child taxa:

  • Name	Nomenclatural status	Taxonomic status
    "Candidatus Azotimanducaceae" Nguyen et al. 2023	not validly published	preferred name (not pro-correct name)
    Azotobacteraceae Pribram 1933 (Approved Lists 1980)	validly published under the ICNP	synonym
    Branhamaceae Catlin 1991	validly published under the ICNP, illegitimate name	synonym
    "Chlorobacteriaceae" Geitler and Pascher 1925	not validly published	preferred name (not correct name)
    "Methanomonadaceae" Breed et al. 1957	not validly published	preferred name (not correct name)
    Moraxellaceae Rossau et al. 1991	validly published under the ICNP	correct name
    Perlucidibacaceae Liao et al. 2021	validly published under the ICNP	synonym
    "Permianibacteraceae" Flores-Felix et al. 2025	not validly published	synonym (and no standing)
    Pseudohongiellaceae Chuvochina et al. 2024	validly published under the ICNP	correct name
    Pseudomonadaceae Winslow et al. 1917 (Approved Lists 1980)	validly published under the ICNP	correct name
    [Pseudomonadales, not assigned to family]	artificial parent node of taxa incertae sedis
    "Siderocapsaceae" Pribram 1929	not validly published	preferred name (not correct name)
    Ventosimonadaceae Lin et al. 2016	validly published under the ICNP	correct name

Parent taxon: Gammaproteobacteria Garrity et al. 2005

Assigned by: Liao H, Lin X, Li Y, Qu M, Tian Y. Reclassification of the Taxonomic Framework of Orders Cellvibrionales, Oceanospirillales, Pseudomonadales, and Alteromonadales in Class Gammaproteobacteria through Phylogenomic Tree Analysis. mSystems 2020; 5:e00543-20.

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Record number: 5024