| Name | Class | Order | Family | Genus |
|---|---|---|---|---|
| Methanococcus aeolicus | Methanococci | Methanococcales | Methanococcaceae | Methanococcus |
| Methanococcus maripaludis | Methanococci | Methanococcales | Methanococcaceae | Methanococcus |
| Methanococcus vannielii | Methanococci | Methanococcales | Methanococcaceae | Methanococcus |
| Methanococcus voltae | Methanococci | Methanococcales | Methanococcaceae | Methanococcus |
| Methanothermococcus okinawensis | Methanococci | Methanococcales | Methanococcaceae | Methanothermococcus |
| Methanothermococcus thermolithotrophicus | Methanococci | Methanococcales | Methanococcaceae | Methanothermococcus |