The first instar is metapneustic, later instars are amphipneustic.
2.
The tracheal system is metapneustic in the first instar early age and amphipneustic in the subsequent stages.
3.
The larva is metapneustic ( with only one pair of spiracles, these on the anal segment of the abdomen ), but often with vestigial lateral spiracles ( rarely apneustic ).
4.
Those of the first type are elongated and cylindrical in shape and have a metapneustic or amphipneustic tracheal system, provided with a pair of abdominal spiracles and, possibly, a thoracic pair.
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