| Name | Class | Order | Family | Genus |
|---|---|---|---|---|
| Methanocaldococcus fervens | Methanococci | Methanococcales | Methanocaldococcaceae | Methanocaldococcus |
| Methanocaldococcus indicus | Methanococci | Methanococcales | Methanocaldococcaceae | Methanocaldococcus |
| Methanocaldococcus infernus | Methanococci | Methanococcales | Methanocaldococcaceae | Methanocaldococcus |
| Methanocaldococcus jannaschii | Methanococci | Methanococcales | Methanocaldococcaceae | Methanocaldococcus |
| Methanocaldococcus villosus | Methanococci | Methanococcales | Methanocaldococcaceae | Methanocaldococcus |
| Methanocaldococcus vulcanius | Methanococci | Methanococcales | Methanocaldococcaceae | Methanocaldococcus |
| 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 |
| Methanotorris formicicus | Methanococci | Methanococcales | Methanocaldococcaceae | Methanotorris |
| Methanotorris igneus | Methanococci | Methanococcales | Methanocaldococcaceae | Methanotorris |