IRMNG Taxon list
- Methanothermus fervidus Stetter, 1982
- Methanothermus sociabilis Stetter, 1986
- Zymosarcina maxima (Lindner, 1888) Smit, 1930 accepted as Sarcina maxima Lindner, 1888
- Zymosarcina methanica Smit, 1930 accepted as Methanosarcina methanica (Smit 1930) Kluyver & van Niel, 1936
- Zymosarcina ventriculi (Goodsir, 1842) Smit, 1930 accepted as Sarcina ventriculi Goodsir, 1842
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