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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.
Nervous System of Platyhelminthes. Platyhelminthes occupy a position of strategic phylogenetic importance in that they are the most primitive members of Bilateria and constitute the basal stock from which all higher animal phyla are thought to have evolved.n addition to nerve cords, well-developed nerve nets or plexuses can be found in all flatworm taxa. These include subsurface, submuscular, pharyngeal and intestinal (=stomatogastric) and reproductive nerve plexuses. In some places, the plexuses are in continuity with both main and minor nerve cords.