Name: Caulobacter leidyi corrig. Poindexter 1964 (Approved Lists 1980)

Category: Species

Proposed as: sp. nov.

Etymology: lei’dy.i. N.L. gen. masc. n. leidyi, of Leidy, named for J. Leidy, who observed tufts of (bacterial) growth of fungi in insect guts in 1853

Pronunciation (Latin), gender: … LE͡I-dy-i, masculine

Type strain: ATCC 15260; CIP 106443; DSM 4733; VKM B-1368

Conduct genome-based taxonomy at

16S rRNA gene: AJ227812 Analyse FASTA

Effective publication: Poindexter JS. BIOLOGICAL PROPERTIES AND CLASSIFICATION OF THE CAULOBACTER GROUP. Bacteriol Rev 1964; 28:231-295.

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: synonym (and not recommended for medical use)

Correct name: Sphingomonas leidyi (Poindexter 1964) Chen et al. 2012

Risk group: 1

• Synonyms:

  • Name	Kind
    Sphingomonas leidyi (Poindexter 1964) Chen et al. 2012	homotypic synonym, validly published under the ICNP
    Alteristakelama leidyi (Poindexter 1964) Wang et al. 2025	homotypic synonym, validly published under the ICNP
    Caulobacter leidyia Poindexter 1964 (Approved Lists 1980)	other spelling of name, inaccurate spelling

• Notes:
  • ❗ Caulobacter leidyi is the correct name instead if this species is regarded as a separate species (i.e., if its nomenclatural type is not assigned to another species whose name is validly published, legitimate and not rejected and has priority) within a separate genus Caulobacter.
  • 😷 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 2 times in PubMed until 2025-06-04.
  • 🙅 This name is on the List of Recommended Names for bacteria of medical importance (LoRN) as a synonym of the name to be applied to this species. The name is on LoRN because of the recorded risk group of the genus.
  • 🧍 In the effective publication by Poindexter 1964 [1], the specific epithet is cited as leidyi (named in remembrance of J. Leidy). Publication: Poindexter JS. BIOLOGICAL PROPERTIES AND CLASSIFICATION OF THE CAULOBACTER GROUP. Bacteriol Rev 1964; 28:231-295.
  • 🧍 So, the spelling of the epithet, leidyia (sic), which appears in the Approved Lists of Bacterial Names, has been corrected by Poindexter 1989 [2]. Publication: Poindexter JS. Genus Caulobacter Henrici and Johnson 1935, 83AL. 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. 1924-1939.

Parent taxon: Caulobacter Henrici and Johnson 1935 (Approved Lists 1980)

Assigned by: Poindexter JS. BIOLOGICAL PROPERTIES AND CLASSIFICATION OF THE CAULOBACTER GROUP. Bacteriol Rev 1964; 28:231-295.

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Record number: 774531