Name: Hathewaya histolytica (Weinberg and Séguin 1916) Lawson and Rainey 2016

Category: Species

Proposed as: comb. nov.

Basonym: "Bacillus histolyticus" Weinberg and Séguin 1916

Etymology: his.to.ly’ti.ca. Gr. masc. n. histos, tissue; Gr. masc. adj. lytikos, dissolving; N.L. fem. adj. histolytica, tissue-dissolving

Pronunciation, gender: his-to-LY-ti-ka, feminine

Type strain: ATCC 19401; BCRC 10644; CCRC 10644; CCUG 4854; CIP 103713; CN 1693; DSM 2158; JCM 1403; NCIB 503; NCIMB 503; NCTC 503

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AB566416 Analyse FASTA

Valid publication: Lawson PA, Rainey FA. Proposal to restrict the genus Clostridium Prazmowski to Clostridium butyricum and related species. Int J Syst Evol Microbiol 2016; 66:1009-1016.

IJSEM list: Oren A, Garrity GM. Notification list. Notification that new names and new combinations have appeared in volume 66, part 2 of the IJSEM. Int J Syst Evol Microbiol 2016; 66:1916-1919.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name (and explicitly recommended for medical use)

Risk group: 2

• Synonyms:

  • Name	Kind
    Clostridium histolyticum (Weinberg and Séguin 1916) Bergey et al. 1923 (Approved Lists 1980)	homotypic synonym, validly published under the ICNP
    "Bacillus histolyticus" Weinberg and Séguin 1916	homotypic synonym, not validly published, basonym of name in Approved Lists

• Notes:
  • 🥇 Nomenclatural type of the genus Hathewaya Lawson and Rainey 2016. Publication: Lawson PA, Rainey FA. Proposal to restrict the genus Clostridium Prazmowski to Clostridium butyricum and related species. Int J Syst Evol Microbiol 2016; 66:1009-1016.
  • 😷 The risk group for Belgium has been imported on 2024-02-05. The full classification is: risk group = 2, note = "human and animal pathogen - biological class of risk animal: 2". — The risk group for Germany has been imported on 2023-10-29. The full classification is: risk group = 2. — 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 9 times in PubMed until 2025-06-04.
  • 🫡 This name is on the List of Recommended Names for bacteria of medical importance (LoRN) as the name to be applied to this species. The name is on LoRN because of the recorded risk group of the species itself. This name is not taxonomically suspended any more in favour of Clostridium histolyticum (Weinberg and Séguin 1916) Bergey et al. 1923 (Approved Lists 1980). Publication: Bergey DH, Harrison FC, Breed RS, Hammer BW, Huntoon FM. Bergey's Manual of Determinative Bacteriology, 1st ed. The Williams & Wilkins Co, Baltimore, 1923. Skerman VBD, McGowan V, Sneath PHA. Approved lists of bacterial names. Int J Syst Bacteriol 1980; 30:225-420.
  • 🧍 According to Bartlett et al. (2022), this species is an established human pathogen. Publication: Bartlett A, Padfield D, Lear L, Bendall R, Vos M. A comprehensive list of bacterial pathogens infecting humans. Microbiology (Reading) 2022; 168:0.

Parent taxon: Hathewaya Lawson and Rainey 2016

Assigned by: Lawson PA, Rainey FA. Proposal to restrict the genus Clostridium Prazmowski to Clostridium butyricum and related species. Int J Syst Evol Microbiol 2016; 66:1009-1016.

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Record number: 793805