Types of metamorphosis
Insects without metamorphosis (ametabolous)
At eclosion, the insect resembles the adult, except that it is smaller.
Development therefore simply involves increasing the insect's size by going through successive moults.
Insects with incomplete metamorphosis (hemimetabolous)
The nymph (or larva) resembles an adult without wings; the wings grow larger at each moult.
The larva reaches the adult stage at the final moult.
Insects with complete metamorphosis (holometabolous)
At eclosion, the larva looks very different from the adult and it generally has a very different lifestyle.
When its growth is completed, the larva forms a pupa. Inside this protective envelope, the larva undergoes major structural changes, eventually emerging as the adult stage.