Do Flat And Round Worms Belong To The Same Phylum?

Do Flat And Round Worms Belong To The Same Phylum? Flatworms and roundworms are two types of worms with many differences in their body. Flatworms belong to the phylum Platyhelminthes while roundworms belong to the phylum Nematoda. What phylum is flat worm? The flatworms (Turbellaria) are related to flukes and tapeworms within the Phylum Platyhelminthes,