A calcium-dependent action potential of long duration in the chorionated egg of the locust, Locusta migratoria

Electrical excitability has been demonstrated for the first time in a chorionated insect egg. Depolarization of the locust egg evokes and action potential with a number of unusual features: (1) The duration of the first action potential from an egg bathed in 2 mM Ca saline exceeds 100 s. (2) Excitability is restricted to a particular period of egg development, after chorionation but before oviposition. The input resistance of eggs is reduced …