Methanogenium boonei
M. boonei
Methanogenium frigidum
M. frigidum
Methanogenium marinum
M. marinum
Methanogenium cariaci
Methanogenium organophilum
Methanogenium aggregans
Methanogenium bourgense
Methanogenium frittonii
Methanogenium liminatans
Methanogenium marisnigri
Methanogenium olentangyi
Methanogenium tationis
Methanogenium thermophilicum