17. How are the excretory
systems of the three main
arthropod classes constituted?

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In crustaceans a of excretory
organs green glands exists.The
glands collect residuals the
blood and parts of the . They
are connected ducts to excretory
located under the of the
antennae these pores release
excretions outside.

In small structures called
tubules gather wastes
the blood and them into excretory
that open in intestine. In
these excretions are eliminated
with feces.

In , besides malpighian
tubules, are coxal glands
in the cephalothorax the limbs that
participate in excretion.