| Upon ecdysis, a chitinous duplicature of the exoskeleton is shed and a growth band is added to the valves. |
| At the last ecdysis, the larval skin splits, but the pupa remains within this skin for the whole of its life. |
| In the higher Lepidoptera the pupa is immovable, and the imago, after the ecdysis of the pupal cuticle, must emerge. |
| At ecdysis, the animal sheds the old exoskeleton while absorbing large quantities of water to stretch the new exoskeleton. |
| Four days later, after the fourth ecdysis, the dimorphism becomes a polymorphism. |
| As in crustaceans, autotomy must be done before a critical period so that there is sufficient time to regenerate the appendage before the next ecdysis. |
