Osmoregulation and excretion are aided by nephridia.
It is an invertebrate organ.
Metanephridia:
It is a type of excretory gland.
It's found in annelids, arthropods, and mollusks, among other invertebrates.
A nephridium is made up of a ciliated funnel, or coelom, that opens into the body cavity and is connected to a duct that can be glandularized, folded, or enlarged (vesiculate) and opens to the organism's exterior.