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A stenotherm (from Greek στενός stenos "narrow" and θέρμη therme "heat") is a species or living organism only capable of living or surviving within a narrow temperature range.
The opposite is a eurytherm, an organism that can function at a wide range of different body temperatures.
Examples
Chionoecetes opilio is a stenothermic organism, and temperature affects its biology throughout its life history, from embryo to adult. Small changes in temperature (< 2 °C) can increase the duration of egg incubation for C. opilio by a full year.
References
Stenothermic Wikipedia(Text) CC BY-SA