They do not have book lungs, and breathe through tracheae.
The tracheae of insects are attached to the spiracles, excluding the head.
They have long legs, tracheae, and no median eyes.
Unlike the larger tracheae which are derived of ectodermal stem cells, tracheoles do not molt with the insect.
Instead, they remain in place and fuse themselves to new tracheae at each molt by a cement they produce.
Each opens into an internal pouch, and connects to a system of tracheae.
Unlike as in insects, the tracheae end in hemolymph near the organs, instead of leading into them.
These membranes vibrate rapidly, and enlarged chambers derived from the tracheae make the cicada's body serve as a resonance chamber, greatly amplifying the sound.
