What is the body temperature for Echinodermata?

Echinoderms, such as sea stars and sea urchins, are poikilothermic animals, which means that their body temperature is largely determined by the temperature of their surroundings. They do not have internal mechanisms for regulating their body heat and thus their body temperature fluctuates with the ambient temperature. As such, their body temperature is not fixed and varies depending on the environment they inhabit.