Thermoperiodic regulation of the circadian eclosion rhythm in the flesh fly, Sarcophaga crassipalpis

► In the outdoor soil, Sarcophaga crassipalpis ecloses in the late morning. ► The eclosion advances as the amplitude of the sinusoidal temperature cycle decreases. ► This response allows pupae located at any depth to eclose in the late morning. ► The abrupt temperature increase resets the eclosion phase to the increasing time. ► This increase may act as the late-morning signal for the eclosion clock.