SPIRACLE
\spˈɪɹəkə͡l], \spˈɪɹəkəl], \s_p_ˈɪ_ɹ_ə_k_əl]\
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One of the external openings communicating with the air tubes or tracheae of insects, myriapods, and arachnids. They are variable in number, and are usually situated on the sides of the thorax and abdomen, a pair to a segment. These openings are usually elliptical, and capable of being closed. See Illust. under Coleoptera.
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A tubular orifice communicating with the gill cavity of certain ganoid and all elasmobranch fishes. It is the modified first gill cleft.
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Any small aperture or vent for air or other fluid.
By Oddity Software
By Daniel Lyons
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The first pharyngeal aperture or visceral cleft; the branchial passage between mandibular and hyoid arches in Fishes; a lateral branchial opening in tadpoles ; a nasal aperture of a Cetacean; a respiratory aperture behind the eye of Skates and Rays; a breathing aperture of Insects.
By Henderson, I. F.; Henderson, W. D.