Definitions
from The Century Dictionary.
- noun In entomology, the respiratory tube of certain aquatic larvæ and dipterous puparia.
Etymologies
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Examples
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However, by a strange coincidence, an elaborate respiratory function test was in progress, and the breathing-tube inserted in Loren's mouth made conversation impossible.
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As the breathing-tube is very short the larvæ must come close to the surface to breathe, and when they are feeding we find them lying just under and parallel to the surface of the water with their curious round heads turned entirely upside down as they feed on the particles that are floating on the surface (Figs. 83, 84).
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Those species that feed close to the surface and have the tip of the breathing-tube above the surface most of the time have very small tracheal gills, while those that feed mostly on the bottom have them well developed.
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The length of the breathing-tube is correlated with the feeding-habits of the larvæ.
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Instead of the breathing-tube on the eighth segment of the abdomen as in the larva, the pupa has two trumpet-shaped tubes on the back of the thorax through which it now gets its air from above the surface.
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Most species have on the eighth abdominal segment a rather long breathing-tube the tip of which is thrust just above the surface of the water when they come up for air.
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Amber fossils are promising if we can more tightly correlate breathing-tube volume to oxygen.
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Measurements of insect breathing-tube volume from the experiment could be correlated with that of insects trapped in amber, VandenBrooks said, providing a solid tool to determine oxygen levels in poorly understood eras.
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After the dragonflies and other bugs grew up, the researchers measured their breathing-tube volumes.
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-- with a breathing-tube in his trachea, and Eternity under his pillow ... '
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