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Other Platyhelminthes characteristics shared by these creatures is they are bilaterally symmetrical, this means the left and right sides of their bodies are mirror images of each other. They have distinctive head and tail ends and their body contains three cell layers.
CLASSIFICATION OF PLATYHELMINTHES. (Girish Chandra). PHYLUM PLATYHELMINTHES. Commonly known as flat worms, they are acoelomate, triploblastic and bilaterally symmetrical animals which have no skeleton, respiratory and circulatory systems.Alimentary canal when present is in blind sac plan.lass TURBELLARIA (Dugesia; Bipalium; Leptoplana; Notoplana). They are free living eddy worms, with flattened body and mouth located on the ventral side. Suckers are absent and epidermal cells are multiciliated.