Question

Excretory system in Platyhelminthes and other invertebrate phyla characterized by a ciliated excretory tubule that opens to the exterior through a nephridiopore but is capped at its internal end by a specialized, flagellated terminal cell.

Answer 1

ANSWER :

The animals of phylum platyhelminthes (flatworms) have cilliated excretory tubules (flame cells) as excretory organ and other invertebrates phyla such as nematohelminthes have protonehredia that opens to the exterior through a nephridiopore but is capped at its internal end by a specialised, flagellated cell.