Name: Hyphomonas polymorpha (ex Pongratz 1957) Moore et al. 1984

Category: Species

Proposed as: sp. nov., nom. rev.

Etymology: po.ly.mor’pha. N.L. fem. adj. polymorpha, multiform; from Gr. masc./fem. adj. polymorphos, corresponding to the varied shapes of the cells

Pronunciation (Latin), gender: … po-ly-MOR-p^ha, feminine

Type strain: ATCC 33881; DSM 2665; IFAM PS-728; JCM 21104; NBRC 102482; PS728

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: KF863144 Analyse FASTA

Valid publication: Moore RL, Weiner RM, Gebers R. Genus Hyphomonas Pongratz 1957 nom. rev. emend., Hyphomonas polymorpha Pongratz 1957 nom. rev. emend., and Hyphomonas neptunium (Leifson 1964) comb. nov. emend. (Hyphomicrobium neptunium). Int. J. Syst. Bacteriol. 1984; 34:71-73. 🇺🇸

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

Risk group: 1

• 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:
  • 🥇 Nomenclatural type of the genus Hyphomonas (ex Pongratz 1957) Moore et al. 1984. Publication: Moore RL, Weiner RM, Gebers R. Genus Hyphomonas Pongratz 1957 nom. rev. emend., Hyphomonas polymorpha Pongratz 1957 nom. rev. emend., and Hyphomonas neptunium (Leifson 1964) comb. nov. emend. (Hyphomicrobium neptunium). Int. J. Syst. Bacteriol. 1984; 34:71-73. 🇺🇸
  • 😷 The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 1, note = "Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No". — The risk group for Swiss Confederation has been imported on 2024-02-01. The full classification is: risk group = 1. — The risk group for Germany has been imported on 2023-10-29. The full classification is: risk group = 1. — If in doubt, use the risk group given in the regulations for your country and, if these are not available, use the risk group given in the catalogue of the culture collection from which you have obtained or intend to obtain the strain.
  • 🎓 Name mentioned 3 times in PubMed until 2025-06-04.
  • 🧍 However, Moore and Weiner 1989 [2] give the strain PS278 = ATCC 33881= IFAM PS728 as the type strain. Publication: Moore RL, Weiner RM. Genus Hyphomonas (ex Pongratz 1957) Moore, Weiner and Gebers 1984, 71VP. In: Staley JT, Bryant MP, Pfennig N, Holt JG (eds), Bergey's Manual of Systematic Bacteriology, first edition, vol. 3, The Williams & Wilkins Co., Baltimore, 1989, p. 1904-1910. 🇺🇸
  • 🧍 Pongratz 1957 [1] reported that upon isolation on solid media, colonies appear as smooth or rough types. On page 71, the type strain is designated as PS728 (S for smooth) = ATCC 33881 = IFAM PS728, and on page 72, the type strain is given as PR728 (R for rough) = ATCC 33881 = IFAM PR728. According to Rule 33b note 2 the type strain should be PR728 = ATCC 33881 = IFAM PR728. However, Moore and Weiner 1989 [2] give the strain PS278 = ATCC 33881 = IFAM PS728 as the type strain. Publication: Pongratz E. D'une bactérie pédiculée isolée d'un pus de sinus. Schweiz. Z. Allg. Pathol. Bakteriol. 1957; 20:593-608.

Parent taxon: Hyphomonas (ex Pongratz 1957) Moore et al. 1984

Assigned by: Moore RL, Weiner RM, Gebers R. Genus Hyphomonas Pongratz 1957 nom. rev. emend., Hyphomonas polymorpha Pongratz 1957 nom. rev. emend., and Hyphomonas neptunium (Leifson 1964) comb. nov. emend. (Hyphomicrobium neptunium). Int. J. Syst. Bacteriol. 1984; 34:71-73. 🇺🇸

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Record number: 776988