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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.
The phylum is Platyhelmenthus   The three classes are   1. turbellaria   2. trematoda   3. cestoda   Platyhelminthes is a phylum composed of three classes of fl â¦ atworms. Members of the phylum Platyhelminthes are dorsoventrally flattened   with a triploblastic body composed of three different tissue layers:   ectoderm, endoderm, and the mesoderm. These animals are bilaterally   symmetrical, meaning that a slice directly through the middle can produce   two mirror images.