Methanocorpusculum

Abstract Me.tha.no.cor.pus'cu.lum. N.L. neut. n. methanum methane; L. neut. n. corpusculum a particle; N.L. neut. n. Methanocorpusculum a methane‐producing particle. Small, irregular cocci, <2 μm in diameter. Endospores not formed. Stain Gram‐negative. Lysed by detergent or hypotonic shock. Nonmotile or very weakly motile. Strictly anaerobic. Fastest growth at 30–37°C, pH near 7.0. No requirement of NaCl for growth but moderately NaCl tolerant, depending on the species. Energy production by reduction of CO 2 to CH 4 with H 2 , formate, and sometimes secondary alcohols as electron donors; acetate, methylamines, or methanol are not catabolized. Acetate and either yeast extract, peptones, or rumen fluid are required as carbon and nitrogen sources. Sulfide serves as a sulfur source. Occurs in sewage sludge digesters, anaerobic wastewater treatment plants, and anaerobic reactors. Methanocorpusculum is the only genus in the family Methanocorpusculaceae and currently comprises four species with validly published names. DNA G + C content (mol%) : 49.8–52.4 (Genome). Type species : Methanocorpusculum parvum Zellner et al. 1987, VL24. Taxonomic and Nomenclature Notes According to the List of Prokaryotic names with Standing in Nomenclature (LPSN), the taxonomic status of the genus Methanocorpusculum is: correct name (last update, February 2025) * . LPSN classification: Archaea / Methanobacteriati / Methanobacteriota / Methanomicrobia / Methanomicrobiales / Methanocorpusculaceae / Methanocorpusculum The genus Methanocorpusculum can also be recovered in the Genome Taxonomy Database (GTDB) as g__Methanocorpusculum (version v220) ** . GTDB classification: d__Archaea / p__Halobacteriota / c__Methanomicrobia / o__Methanomicrobiales / f__Methanocorpusculaceae / g__Methanocorpusculum * Meier‐Kolthoff et al. ( 2022 ). Nucleic Acids Res , 50 , D801 – D807 ; DOI: 10.1093/nar/gkab902 ** Parks et al. ( 2022 ). Nucleic Acids Res , 50 , D785 – D794 ; DOI: 10.1093/nar/gkab776