tracheal gill मीनिंग इन हिंदी

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The larvae have paired plumose tracheal gills on each of the first eight abdominal segments.
The tracheal gills are equipped with little winglets that perpetually vibrate and have their own tiny straight muscles.
This peripheral tracheal division may also lie within the tracheal gills where gaseous exchange may also take place.
And there is no doubt that the tracheal gills of the mayfly nymph in many species look like wings.
Some tracheal gills, which started their way as exits of the respiratory system and over time were modified into locomotive purposes, eventually developed into wings.
Other smaller numbers of aquatic insects have a closed tracheal system, for example, Odonata, Tricoptera, Ephemeroptera, which have tracheal gills and no functional spiracles.
Then comes the fact that insect ( larva and nymph ) gills are actually a part of a modified, closed trachea system specially adapted for water, called tracheal gills.
They are unusual in that although they are generally aquatic, taking in dissolved oxygen through abdominal lateral filaments and tracheal gills, they also have spiracles that allow them to take in air directly when above water.
And finally when looking at the three most primitive insects with aquatic nymphs ( called naiads : Ephemeroptera, Odonata and Plecoptera ), each order has its own kind of tracheal gills that are so different from one another that they must have separate origins.