21. The anterior spiracles ( prothoracic spiracles ) end bluntly and are not elongated. 22. This suggests the origin of both the wings and the spiracles are related. 23. The spiracles are reduced to vestigial remnants and the bones are lightly ossified. 24. They have elongated, cylindrical bodies, with short barbels and large spiracles . 25. It contains small, circular spiracles at the dorsal base of its head. 26. Tadpoles have a spiracle that protrudes from the substrate, thus enabling respiration. 27. They are bright orange with black and yellow bands and bright white spiracles . 28. The spiracle opened on the middle of the left side of the body. 29. The spiracle became large and prominent, enabling these fishes to draw air. 30. The front two segments have a pair of spiracles which are used in respiration.
