The osmoregulatory/excretory system of a freshwater flatworm is based on the operation of B. metanephridia.
Metanephridia acquire the liquid from the celomatic cavity via a funnel-like shape known as a nephrostome. The coelomic fluid enters the tubules, water and nutrients are reabsorbed, and the metabolic waste together with ammonia, urea, or uric acid is excreted.
The principal distinction between protonephridia and metanephridia is that protonephridia are a community of useless-stop tubules without internal openings, while metanephridia are a form of excretory glands with a ciliated funnel opening into the frame cavity.
Metanephridium is an excretory organ discovered in invertebrates like arthropods, annelids, and mollusks. It has ciliated funnel systems which open into the body cavity this is attached to a duct. This shape in the end opens to the invertebrates outdoors.
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