B, spiracle on prothorax; c, protruded head region; d, tail-end with functional spiracles; e, f, head region with mouth hooks protruded; g, hooks retracted; h, eggs. [Please select]
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(The head is directed downwards and the tail-siphon with spiracle points upwards to the surface of the water.) [Please select]
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5 to 3 times the diameter of one; the center-piece of the spiracle is black, the ring yellow surrounded by an outer dusky margin. [Please select]
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In all four stages, spiracle persistent, and pigmentation resembling that of early stages. [Please select]
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Aeriductus: a spiracle: the tracheal, gill-like structures of aquatic larvae: more specifically the tail-like extensions of rat-tailed maggots and some aquatic Hemiptera. [Please select]
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Atrium: a chamber just within the spiracle and before the occluding structure to the trachea. [Please select]
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