Psychrophiles
optimum temperature 15oC
capable of growth at 0 - 20oC
Mesophiles
optimum temperature 40oC
Range 10o - 40oC (45)
most human pathogens
Thermophiles
optimum temperature 60oC
capable of growth at 40 - 70oC
Hyperthermophiles
Archaea that grow optimally above 80°C
found in seafloor hot-water vents