Structure of aquatic insects with gills.

Insect nymphs living under water obtain oxygen through gills in many shapes.
Such internal or external tracheal gills occur in insects with a closed system that is lacking in functional spiracles.
Oxygen from the water enters the bodies across the gills for delivery to the tracheoles.


Dragonfly nymphs have rectal gills.




May fly and damselfly nymphs sport caudal gills at the end of their tails.




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