Figures 3.9


Schematic diagram of a well-developed circulatory system:
Figures 3.9. Schematic diagram of a well-developed circulatory system:

(a) longitudinal section through body; (b) transverse section of the abdomen; (c) transverse section of the thorax. Arrows indicate directions of hemolymph flow. (After Wigglesworth 1972)

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  The main endocrine centers in a generalized insect.
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  Schematic diagram of a generalized tracheal system seen in a transverse section of the body at the level of a pair of abdominal spiracles.