Animal World

Sponges, Coelenterates, and Worms

What three groups are included in the flatworms?

Flatworms belong to the phylum Platyhelminthes. They are flat, elongated, acoelomate animals that exhibit bilateral symmetry and have primitive organs. The members of the flatworms are: 1) planarians, 2) flukes, and 3) tapeworms.


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