Definitions ·Mesophiles-Topt=20-45℃ Thermophiles-Topt=45-80C Hyperthermophile-Topt =>80C Note that the upper temperature limit for life may be 150CDefinitions • Mesophiles - Topt = 20 - 45ºC • Thermophiles - Topt = 45 - 80ºC • Hyperthermophile - Topt = >80ºC • Note that the upper temperature limit for life may be ~ 150ºC