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Insect Morphology and SystematicsInsect Morphology and SystematicsMalpighian Tubules
The main organ of excretion and osmoregulation in insects are the malpighian
tubules, acting in association with rectum or ileum. Malpighian tubules are outgrowths of
the alimentary canal and consist of long thin tubles formed of a
single layer of cells
surrounding a blind-ending
lumen,
they are absent in spring tail and aphids, 2 numbers in
scale insects, 4 in bugs, 5 in mosquitoes, 6 in moths and butterflies, 60 in cockroach and
more than 200 in locusts. Generally they are free, waving around in the haemolymph
where they filter out solutes. Each tubule is externally covered by
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