Heat X-Philes

This group includes not only “simple” thermophiles, with an optimal growth temperature of anywhere from 50°C to 80°C (OGT=65°C±15°C), or 122°F to 176°F (149°F±27°F), but also hyperthermophiles, who have an optimal growth temperature over 80°C (OGT≥80°C) or 176°F (OGT≥176°F).

Thermophilic Archaea & Hyperthermotolerant, Near-Thermophilic Archaeal Mesophiles
This group includes not only “simple” archaeal thermophiles, with an optimal growth temperature of anywhere from 50°C to 80°C (OGT=65°C±15°C), or 122°F to 176°F (149°F±27°F), but also archaeal hyperthermophiles, who have an optimal growth temperature over 80°C (OGT≥80°C) or 176°F (OGT≥176°F).

Thermophilic Bacteria & Hyperthermotolerant, Near-Thermophilic Bacterial Mesophiles
This group includes not only “simple” bacterial thermophiles, with an optimal growth temperature of anywhere from 50°C to 80°C (OGT=65°C±15°C), or 122°F to 176°F (149°F±27°F), but also bacterial hyperthermophiles, who have an optimal growth temperature over 80°C (OGT≥80°C) or 176°F (OGT≥176°F).

Here organisms are listed first by the upper end of their temperature range, then by OGT, then by the lower end of their temperature range, and for any organisms for which these properties are unknown or the same, they will be listed in alphabetical order.