Hormonal regulation of metamorphosis.
- The Corpus cardiacum secretes prothoracicotropic hormone.
- PTTH stimulates the prothoracic gland to produce ecdysone.
- Ecdysone is released periodically during molting (ecdysis) of the larva.
- The Corpus allatum secretes juvenile hormone.
High levels of JH signal leads to another larval stage,
while low levels of JH promotes the formation of a pupa and metamorphosis.