Figures 3.8


The main endocrine centers in a generalized insect.
Figures 3.8. The main endocrine centers in a generalized insect.

(After Novak 1975)

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  Mediolongitudinal section of an immature cockroach of Periplaneta americana (Blattodea: Blattidae) showing internal organs and tissues.
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  Schematic diagram of a well-developed circulatory system: