methanothrix methanothrix in the taxonomy of microorganisms, the methanothrix are a genus of the euryarchaeota. methanothrix scientific classification domain: archaea kingdom: euryarchaeota phylum: euryarchaeota class: methanomicrobia order: methanosarcinales family: methanosaetaceae genus: methanothrixhuser, wuhrmann & zehnder 1983 nom. nov. type species methanothrix soehngeniihuser, wuhrmann & zehnder 1983 species m. harundinacea "ca. m. paradoxa" m. soehngenii m. thermoacetophila synonyms methanosaeta patel and sprott 1990 phylogeny 16s rrna-based ltp_01_2022 53 marker proteins based gtdb 07-rs207 m. harundinacea (ma, liu & dong 2006) akinyemi et al. 2021 m. soehngenii huser, wuhrmann & zehnder 1983 m. thermoacetophila corrig. nozhevnikova & chudina 1988 m. harundinacea m. soehngenii (incl. methanosaeta concilii) m. thermoacetophila