Spiracles are respiratory openings found on the thorax and abdomen of insects. The spiracles are connected to trachea - tubes within the insect's body. Air enters the trachea via the spiracles and the oxygen then diffuses into the insect's body.
Insect blood, haemolymph, is not used to transfer oxygen around the body of the insect.
The spiracles are clearly visible as black dots on the side of each body segment of this beetle larva.
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