First case of endothermy in semisessile animals

Endothermy is generally believed to have coevolved with highly active lifestyle in animals, and to be permanent (combined with homeothermy) only in some vertebrates, due in part to size restrictions on endothermic animals. All invertebrates are known to possess endothermy and exhibit it only when engaged in physically intensive behaviors. I report the discovery of permanent endothermy during one part of the life cycle in two species of semisessile lanternflies (Fulgoridae), proving the established assumptions about physiological and morphological prerequisites for permanent endothermy to be wrong: apparently, permanent endothermy can evolve even in very small, semisessile animals as long as they have access to sufficient energy supply.