What are the excretory organs of worms and insects?

The organs of excretion in flatworms are most simply arranged. So, the planaria has an excretory system, consisting of convoluted tubules, starting in the worm’s body with stellate cells.
Ringworms, for example, earthworms, have an excretory system consisting of excretory tubes located in pairs in each body segment.
In insects, the final metabolic products from the body cavity collect in the Malpighian vessels.

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