The number of spiracles is greatly reduced; in the adult a pair is present on the mesothorax, sometimes also a pair on the metathorax, and there is always a pair on the first and another pair on the eighth abdominal segment. [Please select]
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Amphipneustic: applied to larvae which have the spiracles confined to the anterior and terminal segments. [Please select]
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The air gains access to these tubes through a number of paired air-holes or spiracles, arranged segmentally in series. [Please select]
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The spiracles are now open, and the stone-fly breathes atmospheric air like other flying insects. [Please select]
Larva of Gall-midge (_Contarinia nasturtii_), ventral view showing anchor process (_a_), and spiracles projecting at sides. [Please select]
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Further examination shows a striking modification in the arrangement of the spiracles. [Please select]
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In many maggots the mouth-hooks and the front spiracles become more and more complex in form in the successive instars. [Please select]
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Many members of the hover-fly family (Syrphidae) have maggots with the tail-spiracles situated at the end of a prominent tubular process. [Please select]
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The tip of the tail is projected above the water and air is taken in at two small breathing pores or spiracles. [Please select]
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There are spiracles on the sides of the thorax, too, but they do not show so plainly as those on the abdomen. [Please select]
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