Figures 3.10


Schematic diagram of a generalized tracheal system seen in a transverse section of the body at the level of a pair of abdominal spiracles.
Figures 3.10. Schematic diagram of a generalized tracheal system seen in a transverse section of the body at the level of a pair of abdominal spiracles.

Enlargements show: (a) an atriate spiracle with closing valve at inner end of atrium; (b) tracheoles running to a muscle fiber. (After Snodgrass 1935)

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  Some basic variations in the open (a-c) and closed (d-f) tracheal systems of insects.