A spiracle or stigma is the opening in the exoskeletons of insects, myriapods, velvet worms and many arachnids that admits air into the respiratory system. In insects, spiracles often occur as bilateral pairs along the thorax and abdomen.
A spiracle or stigma is the opening in the exoskeletons of insects, myriapods, velvet worms and many arachnids that admits air into the respiratory system. In insects, spiracles often occur as bilateral pairs along the thorax and abdomen.
Source: Wikipedia "Spiracle (arthropods)" · CC BY-SA 4.0
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