Aquatic insects sometimes have evaginations of the body surface called _______ that are densely supplied with trachea and covered with a thin cuticle.

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Tracheal gills are specialized structures in aquatic insects that facilitate gas exchange. They are extensions of the body surface, richly supplied with tracheae, and covered with a thin cuticle to allow for efficient oxygen absorption from water.

Aquatic Insects Sometimes Have Evaginations of the Body Surface Called