Spiracle or spiraculum may refer to:
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Spiracle (arthropods)
A spiracle or stigma is the opening in the exoskeletons of insects and some spiders to allow air to enter the trachea. In the respiratory system of insects, the tracheal tubes primarily deliver oxygen directly into the animals' tissues. The spi ...
, opening in the exoskeletons of some arthropods
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Spiracle (vertebrates)
Spiracles () are openings on the surface of some animals, which usually lead to respiratory systems.
The spiracle is a small hole behind each eye that opens to the mouth in some fish. In the jawless fish, the first gill opening immediately behind ...
, openings on the surface of some vertebrates
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Spiraculum, a genus of land snails in family
Cyclophoridae
Cyclophoridae is a taxonomic family of small to large tropical land snails with an operculum, terrestrial gastropod mollusks in the order Architaenioglossa belonging to the subclass Caenogastropoda (according to the taxonomy of the Gastropo ...
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