Malpighian tubule system

[2][3][4][5][6] The system consists of branching tubules extending from the alimentary canal that absorbs solutes, water, and wastes from the surrounding hemolymph.

The insect orders, Dermaptera and Thysanoptera do not possess these muscles and Collembola and Hemiptera:Aphididae completely lack a Malpighian tubule system.

Wastes such as urea and amino acids are thought to diffuse through the walls, while ions such as sodium and potassium are transported by active pump mechanisms.

Larvae of all species in genus Arachnocampa use modified and swollen Malpighian tubules to produce a blue-green light[7] attracting prey towards mucus-coated trap lines.

In insects which feed on plant material containing noxious allelochemicals, Malpighian tubules also serve to rapidly excrete such compounds from the hemolymph.

Stylised diagram of the last part of the insect's digestive tract showing malpighian tubule ( orthopteran type)
Malpighian tubules of a dissected cockroach, indicated by yellow arrow. Scale bar, 2 mm.
Arachnocampa luminosa larvae