Triops eggs enter a state of extended diapause when dry, and will tolerate temperatures of up to 98 °C (208 °F) for 16 hours, whereas the adult cannot survive temperatures above 34 °C (93 °F) for 24 hours or 40 °C (104 °F) for 2 hours.
The diapause also prevents the eggs from hatching too soon after rain; the pool must fill with enough water for the dormancy to be broken.
Early Cretaceous (Berriasian)
Huangbangi Valley, Beipiao, Liaoning Province, China
Two 75mm and 60mm notostracan arthropods on 155mm slab