Name: Methanogenium thermophilicum Rivard and Smith 1982

Category: Species

Proposed as: sp. nov.

Etymology: ther.mo.phi’li.cum. Gr. fem. adj. thermê, heat; N.L. adj. philus -a -um, friend, loving; from Gr. adj. philos -ê -on, loving; N.L. neut. adj. thermophilicum, heat loving (sic)

Pronunciation (Latin), gender: … t^her-mo-P^HI-li-kum, neuter

Type strain: ATCC 33837; CR-1; DSM 2373; OCM 174

Conduct genome-based taxonomy at

16S rRNA gene: AB065297 Analyse FASTA

Valid publication: Rivard CJ, Smith PH. Isolation and characterization of a thermophilic marine methanogenic bacterium, Methanogenium thermophilicum sp. nov. Int. J. Syst. Bacteriol. 1982; 32:430-436.

Nomenclatural status: validly published under the ICNP

Taxonomic status: synonym

Correct name: Methanoculleus thermophilus corrig. (Rivard and Smith 1982) Maestrojuán et al. 1990

Risk group: 1

• Synonyms:

  • Name	Kind
    Methanoculleus thermophilus corrig. (Rivard and Smith 1982) Maestrojuán et al. 1990	homotypic synonym, validly published under the ICNP
    Methanoculleus thermophilicus (Rivard and Smith 1982) Maestrojuán et al. 1990	homotypic synonym, inaccurate spelling
    Methanogenium frittonii Harris et al. 1996	heterotypic synonym, validly published under the ICNP

• Emendations:
  • Zabel et al. 1985 Zabel HP, König H, Winter J. Emended description of Methanogenium thermophilicum, Rivard and Smith, and assignment of new isolates to this species. Syst Appl Microbiol 1985; 6:72-78. Euzeby JP. List of changes in taxonomic opinion no. 1. Notification of changes in taxonomic opinion previously published outside the IJSEM. Int J Syst Evol Microbiol 2005; 55:7-8.

• Notes:
  • ⏰ According to Spring et al. (2005), this species is an earlier heterotypic synonym of Methanogenium frittonii Harris et al. 1996. Publication: Spring S, Schumann P, Sproer C. Methanogenium frittonii Harris et al. 1996 is a later synonym of Methanoculleus thermophilus (Rivard and Smith 1982) Maestrojuan et al. 1990. Int J Syst Evol Microbiol 2005; 55:1097-1099. 🇩🇪
  • ❗ Methanogenium thermophilicum 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 Methanogenium.
  • 😷 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 2 times in PubMed until 2025-06-04.
  • 🧍 The specific epithet thermophilicum (sic) has been corrected in the new combination Methanoculleus thermophilus [see, Methanoculleus thermophilus corrig. (Rivard and Smith 1982) Maestrojuán et al. 1990, comb. nov.]. However the name "Methanogenium thermophilum" corrig. has never been formally proposed before December 14, 2000 (date of publication of the amended Rule 61; see Int. J. Syst. Evol. Microbiol., 2000, 50, page 2239, column 2). Consequently, in the "List of Prokaryotic names with Standing in Nomenclature", the epithet thermophilicum (sic) has been maintained for Methanogenium thermophilicum. Publication: Maestrojuán GM, Boone DR, Xun L, Mah RA, Zhang L. Transfer of Methanogenium bourgense, Methanogenium marisnigri, Methanogenium olentangyi, and Methanogenium thermophilicum to the genus Methanoculleus gen. nov., emendation of Methanoculleus marisnigri and Methanogenium and description of new strains of Methanoculleus bourgense and Methanoculleus marisnigri. Int. J. Syst. Bacteriol 1990; 40:117-122. 🇺🇸

Parent taxon: Methanogenium Romesser et al. 1981

Assigned by: Rivard CJ, Smith PH. Isolation and characterization of a thermophilic marine methanogenic bacterium, Methanogenium thermophilicum sp. nov. Int. J. Syst. Bacteriol. 1982; 32:430-436.

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Record number: 777892