what is the excreatory organ in hilminthes?
Helminths may be classified into nematodes or roundworms, trematodes or flukes and
cestodes or tapeworms.
In Nematoda, excretory system is simple and tubular or epidermal glands, no cilia or
flame cells in Nematoda.
In flukes, excretory system is of a protonephridial type with flame cells. A flame cell is a
hollow, terminal excretory cell that contains a beating (flamelike) group of cilia. These
cells, anchored in the parenchyma, direct tissue filtrate through canals into the two
main collecting ducts. In tapeworm also, the excretory system is of the flame cell type.