What is metanephridia
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A metanephridium (meta = "after") is a type of excretory gland found in many types of invertebrates such as annelids, arthropods and mollusca. (In mollusca, it is known as the Bojanus organ.)
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A metanephridium typically consists of a ciliated funnel opening into the body cavity connected to a duct which may be variously glandularised, folded or expanded and which typically opens to the organisms exterior.
These ciliated tubules pump water carrying surplus ions, metabolic waste, toxins from food and useless hormones out of the organism by directing them down funnel shaped bodies called nephrostomes.
This waste is passed out of the organism at the nephridiopore.
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