Nephridia pl. : of Nephridium

Example:
what is the function of the Nephridia for an earthworm?

Taxonomy
cells, Nephridium, metanephridia, protonephridium, free encyclopedia, Protonephridia, terminal, tube, ciliated, organism, metanephridium, body cavity, partial vacuum, perforations, Nephridia, tubules, search, organs.

Defination from the web:
Nephridia) Jump to: navigation, search. Nephridia are invertebrate organs which function similar to kidneys. They remove metabolic wastes from an animal's body. ...