The nasal opening of whales and other cetaceans is called a spiracle, as is the respiratory opening behind the eyes of rays and skates. |
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The plastron is actually a modified air storage chamber that consists of air in a series of cuticular grooves radiating from a spiracle. |
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Most sharks and all rays have an opening behind each eye, called a spiracle, which is a modified first gill cleft. |
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Each posterior spiracle has three openings or slits arranged parallel or converging, on a sclerotized plate. |
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The posterior spiracle forms a crescent with six to nine mounted pores. |
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In tadpoles the spiracle is the excurrent opening from the gill chamber. |
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Unless they are replaced by frequent trips to the surface, air supplies may be lost completely, thus allowing water to reach and enter the spiracle, which would result in drowning. |
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The spiracle is used to pull water into the gill chambers. |
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Two booklungs and a single tracheal spiracle anterior to spinnerets. |
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