Name: Caulobacterales Henrici and Johnson 1935 (Approved Lists 1980)

Category: Order

Proposed as: ord. nov.

Etymology: Cau.lo.bac.te.ra’les. N.L. masc. n. Caulobacter, type genus of the order; L. fem. pl. n. suff. -ales, ending to denote an order; N.L. fem. pl. n. Caulobacterales, the Caulobacter order

Pronunciation (Latin), gender: ka͡u-lo-bak-te-RA-les, feminine

Type genus: Caulobacter Henrici and Johnson 1935 (Approved Lists 1980)

Effective publication: Henrici AT, Johnson D. Stalked bacteria, a new order of Schizomycetes. Journal of Bacteriology 1935; 29:3-4.

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
    Hyphomonadales Kevbrin et al. 2021	heterotypic synonym, validly published under the ICNP
    Maricaulales Kevbrin et al. 2021	heterotypic synonym, validly published under the ICNP

• Notes:
  • 🥇 Nomenclatural type of the class "Caulobacteria" Cavalier-Smith 2020. Publication: Cavalier-Smith T, Chao EE. Multidomain ribosomal protein trees and the planctobacterial origin of neomura (eukaryotes, archaebacteria). Protoplasma 2020; 257:621-753. 🇬🇧
  • 🥇 Nomenclatural type of the subclass "Caulobacteridae" Ferla et al. 2013. Publication: Ferla MP, Thrash JC, Giovannoni SJ, Patrick WM. New rRNA gene-based phylogenies of the Alphaproteobacteria provide perspective on major groups, mitochondrial ancestry and phylogenetic instability. PLoS One 2013; 8:e83383. 🇳🇿
  • 🧕 Ferla et al. (2013) assigned this order to the subclass "Caulobacteridae" Ferla et al. 2013. Publication: Ferla MP, Thrash JC, Giovannoni SJ, Patrick WM. New rRNA gene-based phylogenies of the Alphaproteobacteria provide perspective on major groups, mitochondrial ancestry and phylogenetic instability. PLoS One 2013; 8:e83383. 🇳🇿
  • 🧒 Hallgren et al. (2025) assigned the family "Aquidulcibacteraceae" Hallgren et al. 2025 to this order. Publication: Hallgren J, Dharamshi JE, Rodriguez-Gijon A, Nuy J, Garcia SL, Jonas K. Widespread potential for phototrophy and convergent reduction of lifecycle complexity in the dimorphic order Caulobacterales. Nat Commun 2025; 16:11003. 🇸🇪
  • 🧒 Henrici and Johnson (1935) assigned the genus Caulobacter Henrici and Johnson 1935 (Approved Lists 1980) to this order. Publication: Henrici AT, Johnson DE. Studies of Freshwater Bacteria: II. Stalked Bacteria, a New Order of Schizomycetes. J Bacteriol 1935; 30:61-93.
  • 🧒 Henrici and Johnson (1935) assigned the genus Caulobacter Henrici and Johnson 1935 (Approved Lists 1980) to this order. Publication: Henrici AT, Johnson D. Stalked bacteria, a new order of Schizomycetes. Journal of Bacteriology 1935; 29:3-4.
  • 🙄 This taxon name is occasionally misprinted (or affected by an OCR error) in some sources as: "Caudobacterales"; "Caulobaceriales"; "Caulubacteriales"; "Cautobacteriales".
  • 🎰 The BRCs most frequently used for deposits in this group are: DSM: 97; LMG: 56; KCTC: 49; ATCC: 42; JCM: 37; CCUG: 30; CIP: 30; VKM: 25; CGMCC: 25; NBRC: 22.

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: 6

• Child taxa:

  • Name	Nomenclatural status	Taxonomic status
    "Aquidulcibacteraceae" Hallgren et al. 2025	not validly published	synonym
    Caulobacteraceae Henrici and Johnson 1935 (Approved Lists 1980)	validly published under the ICNP	correct name
    [Caulobacterales, not assigned to family]	artificial parent node of taxa incertae sedis
    Hyphomonadaceae Lee et al. 2005	validly published under the ICNP	correct name
    Maricaulaceae Kevbrin et al. 2021	validly published under the ICNP	correct name
    Robiginitomaculaceae Kevbrin et al. 2021	validly published under the ICNP	synonym

Parent taxon: Alphaproteobacteria Garrity et al. 2006

Assigned by: Garrity GM, Bell JA, Lilburn T. Class I. Alphaproteobacteria 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 C (The Alpha-, Beta-, Delta-, and Epsilonproteobacteria), Springer, New York, 2005, p. 1. 🇺🇸

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Record number: 5014