Protonephridia and Metanephridia

Protonephridia refer to the tubular, excretory structures in certain invertebrates, usually ending internally in flame cells and having an external pore, while metanephridia refer to primitive excretory organs present in many invertebrates, originating in a ciliated coelomic ______ ___ ___ ________ ___ ___ _______ ________ _________.
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