Species Clostridium paradoxum

Name: Clostridium paradoxum Li et al. 1993

Category: Species

Proposed as: sp. nov.

Etymology: pa.ra.do’xum. Gr. masc./fem. adj. paradoxos, contrary to expectation, incredible; N.L. neut. adj. paradoxum, incredible, referring to the unusual property of sporulated cells to be highly motile

Pronunciation (Latin), gender: … pa-ra-DO-ksum, neuter

Type strain: ATCC 51510; CIP 105527; DSM 7308; JW-YL-7

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: Z69932 Analyse FASTA

Valid publication: Li Y, Mandelco L, Wiegel J. Isolation and characterization of a moderately thermophilic anaerobic alkaliphile, Clostridium paradoxum sp. nov. Int. J. Syst. Bacteriol. 1993; 43:450-460. 🇨🇳

IJSEM list: Anonymous. Notification list. Notification that new names and new combinations have appeared in volume 43, part 3 of the IJSB. Int J Syst Bacteriol 1993; 43:866.

Nomenclatural status: validly published under the ICNP

Taxonomic status: synonym (and not recommended for medical use)

Correct name: Alkalithermobacter paradoxus (Li et al. 1993) Bello et al. 2024

Risk group: 1

Synonyms:

Name	Kind
Alkalithermobacter paradoxus (Li et al. 1993) Bello et al. 2024	homotypic synonym, validly published under the ICNP

Notes:
- ❗ Clostridium paradoxum 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 Clostridium.
- 😷 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 9 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.
- 🧍 According to Ludwig et al. (2021), this "species together with C. thermoalcaliphilum are susceptible to being reclassified as a new genus within the Peptostreptococcaceae". Publication: Ludwig W, Viver T, Westram R, Francisco Gago J, Bustos-Caparros E, Knittel K, Amann R, Rossello-Mora R. Release LTP_12_2020, featuring a new ARB alignment and improved 16S rRNA tree for prokaryotic type strains. Syst Appl Microbiol 2021; 44:126218. 🇪🇸

Parent taxon: Clostridium Prazmowski 1880 (Approved Lists 1980)

Assigned by: Li Y, Mandelco L, Wiegel J. Isolation and characterization of a moderately thermophilic anaerobic alkaliphile, Clostridium paradoxum sp. nov. Int. J. Syst. Bacteriol. 1993; 43:450-460. 🇨🇳

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Record number: 774943

This LPSN page was printed on 2026-02-08 20:22:53

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Species Clostridium paradoxum