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