Tracheole

Indeed, in the muscles of the wings every fibre has its own particular tracheole (small trachea).

A subsequent molting of the intima of the trachea opens a connection between the lumen of the tracheole and the trachea. At the same time or a little later the tracheole breaks forth from its mother cell, uncoils, and extends far beyond the cell in which it was developed.

Oxygen is absorbed all over the body surface through branched tracheoles which are located directly under the body surface.